Question about Sony SDM-HS73/H (Grey) Monitor

23 Answers

Hi there!! Sony SDM-HS73P Problem

Hi there man. I write you from Spain. I´ve read you are a wise dude with monitors, so thought of asking a few questions about my problem.
My Sony SDM-HS73P looks like dead, but after checking it out carefully i realized about next: When i turn the PC on, the ON/OFF light blinks intermitently green, and there´s no image on the screen at anytime. But looking at the screen carefully, i realized that there is the image already, but it's flashing, and no background light of the screen. I've read in other posts that you speak about the inverter circuit's caps blown or something. I'm electronics engineer without too much experience, but i can easily replace some caps. I'm opening it right now and see if there's anything evident, but else, which caps should i change? Thanks in advance for any ray of light you could throw on me!!! And thanks for helping people, you rule. Best regards. Ekaitz.

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  • 50 more comments 
  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 28, 2008

    Hi there. Well, i was writing to Fix-4U, but i don't care if anyone can help ;-)
    Thank you!
    Ekaitz.


  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 28, 2008

    Hi there. Well, i was writing to Fix-4U, but i don't care if anyone can help ;-)
    Thank you!
    Ekaitz.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 28, 2008

    Just opened it and eveything at simple sight looks like normal. I'll post a pic right now. Cheers.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 28, 2008

    Any ideas where can i start checkin things out? I have an oscilloscope, Sine generator and stuff if it helps. Which part of the circuit is the inverter?
    Thanks.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 28, 2008

    More info about the source of the problem: The display was "broken" after changing resolution for a PC video game and when starting the video game.
    All the electrolitic caps look like they're ok.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Yes, changing a new power board would fix the problem, but how much would be the cost? I need to fix this one i have. Did anyone of you work on this model before? Could you please tell me which part of the circuit should i check? Any schematics? Thank you. Is Fix-4U there? Cheers.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    I don't see those four caps in the corners, do i have to remove everything to have access to the display itself and see the four caps there?
    Thank you for they comment!!
    Cheers, Ekaitz.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanks for the service manual link, but that only helps for identifying the different parts of the power circuit, in CN1,CN2, CN3, CN4. Which one is the inverter?

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thank you for the info and the link for the GBoard, but i can't pay $140 for that, do you really think it's worth when these displays are giving so many problems? Cheers, and thanks again!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Gracias Ziraffa, but all the caps tops are flat and look like good. When you refer to the smallest caps, i see some of 4.7 uF, not 470uF, should i check with these? I have some caps so maybe i'm going to try changing one by one. Thank you!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hola Ginko!! Thanks for helping! Are you sure that's the inverter? I've checked it out and looks like it's only some buttons and diodes there, i don't see any components for the DC/AC conversion :-/ Thanks anyway :-)

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Jithin, thanks for the comment. Well, i know probably changing the G Borad the problem will go away, but i'm not spending $140 for maybe only a blown cap!! Thanks for the info anyway!! :-) Best regards.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hi man, i've checked all the diodes and optocoupler and no shorts. There's one component that i'm wondering what it is. The component TH110, which aparently looks like a green cap or something,(on its pins it says E9 and E10 on the PCB), it's resistance zero, short. I'm wondering if this is a tunnel diode or something? Should it be in short? Cheers!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hi Ekse, thanks for trying to find Fix-4U. I don't know which reply was Benimur's? Why aren't all the possible solutions posted here? I have to store all in a Word document, if i don't i lost all! Cheers.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanx Benimur. It's a display problem, of course i've checked the monitor with another pc and a laptop. It's evidently a display probem as even without the signal cable connected, it should display this info little box, which i can see if i look carefully, but no background light.
    Thanks for the advices, i'll be waiting for the welcomejee comment ;-)

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanx for the comment welcomejee! I really apreciate your help, but i'm not able to pay that amount of money for a G board. Could you tell me if this component TH110 should be in short mode (zero ohm) or not? It's the only strange thing i've seen. Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanks Ginko, i've sent you a message. I don't know where the lamp is, and if the terminals to it are accesible on the board (they should). How could i check the inverter circuit? It's worth for 12 euro!!! Thanks again. Best regards.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Benimur!!! A ray of light finally!
    Ok ok, so yes, it looks like a thermistor, the green one. In mine, it says: SCK 054. and in the PCB it says E9 and E10 in terminals and there's a picture of a resistance between both! So this shouldn't be in short! Could this be causing the problem?

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanx Buddy, a bit of new info is always welcome ;-) Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Buddy, thanks for the info, it's very welcome. Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Oh great, thanks Benimur, but dumb of me, i've checked the beep on the tester and didn't realize that it's 6 ohms, not short. And viewing the datasheet, at 25? it should be 5 ohms. So looks like it's okay? Thanks again and sorry my mistake.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Arggg, so 6 ohm is correct then. I'm getting desperate about this. Thanks for the nice support!!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Shuttle, very apreciated, but i'll have to pay for those schematics i supose, and i'm not in the mood :-/
    Thanks for the help! Cheers.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Benimur.
    My board says P/N: 6871TPT241D
    I don't what's a LIPS, and no clue about the chasis CL-42.
    Hope this helps.
    Thank youuuuu!!!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Great, i already answered you in the forum ;-)
    Gracias!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey thanks for the advice, but it's not under warranty i think. Bad luck :-/
    Thank you anyway.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey Benimur!!!
    Great job! Yeah, that's exactly the board!! But unfortunately i can't see any C207. Do you know where should it be? Could you mark it on the pic you posted please (if you know where it is of course haha). Oh, and you found a spanish dealer for me, gotta ask them for the price of the board! :-D
    Thank you veeeery muuuuchhhh!!!! ;-)
    Cheers.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey welcomejee!! Thank you very much for your patience and help!! Yes, that's the exact board we are dealing with, the pic posted by Benimur. Ok, now i know which part of the circuit is the inverter, i´ll pay more attention on the components there. What do you think i should check first? THANK YOU!!! :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanks for the advice mitchstein, but in that case i would have to change all the G-board, wich i want to avoid. Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hi welcomejee, great, but are you familiar with this board? Could you tell me please how can i check these things you're asking? I supose first i must check the output of the rectified DC of the power circuit (the big 120uF caps positive leg should be this DC?), and see if this DC reaches the inverter circuit, and then see if the inverter outputs the AC for the backlights (for this, should i disconnect the two connectors to the backlights?). Later. I really apreciate the help of all of you guys!!!!
    THANK YOU!! I'm learning a looot!! :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Thanx Ginko for your support!!
    Cuidate y pasalo bien estos dias!! Feliz a?o nuevo!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    No it was Fix-4U sorry, thanks anyway :-D.
    Welcomejee, from the two connectors to the backlights, there are three cables on each, two pink fat, and one white thiner. If i disconnect these two connectors, i should see AC power in the pins where the two pink cables were going?
    Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Welcomejee, from the two connectors to the backlights, there are three cables on each, two pink fat, and one white thiner. If i disconnect these two connectors, i should see AC power in the pins where the two pink cables were going?
    Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 29, 2008

    Hey jee, i've disconnected the two connectors that are going to the backlights (i supose you refer to these ones as inverter out conectors), and i don´t measure any AC voltage (tried between both pink cable pins, and pink/white), and all is to 0V AC. Now we should go back step by step? I love this :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Thanx for the advice, but i NEED to repair it, do you understand that? haha. It's a thing between this monitor and me. And it's not only about money. It's about learning, and learning :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Thanks Atomic. If i have to break it, i'll break it, but i'm not throwing the towel and buy a new one and take this to recycle. Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Hey Benimur, where should i measure the output of the inverter? In these two conectors going to the backlights?
    I've measured de AC voltage there and it says zero (the display is on of course). I supose it doesn't need to be connected to measure voltage there.
    Cheers

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Hey jee!! Yes i love it, LOL.
    Okay, tomorrow i´ll take some snaps on it and let you see what my eyes see. Going to bed right now. Thank you very much! Very apreciated and i'm very honored to be guided by such a wise guy :-D
    Cheers!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Could be yes, but first better checking voltages, don't you think? Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Gracias Ginko! He tenido mucha suerte en encontraros!! Pasalo bien!
    Saludos.

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Hey hey hey bros!!
    Now i was taking snaps , and took out the board for the bottom view snaps, i realised there are components also there, which i didn't expect! And Voile!! I see a burnt out IC! I'm trying to connect my camera to the computer but dunno why it doesn't want to recognize it and can't post the pics aaarrrgggg!!! But the IC is a 8 leg small one, similar to a opamp, and there are four of these in the inverter circuit. It's reference is: 4501M/407033. Any idea of what it is? Uf! soldering a new one will be tough, but i must try!
    The big IC in the top center says: BIT3105P/FGP57G0348
    Cheers!!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Thanx Jithin!
    Yes, i hope this is the only problem. Now i have to manage to get this IC somewhere and replace it and see if it works! :-D
    Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Hey Benimur! Thanks for the schematics! grrreat!
    So what's this small burnt IC in the second schematic? A power regulator or something? I supose it's not the exact schematic for this model as i see the two transformers there in the schematics, but there are only two ICs, and in mine there are four, but connections look like coincide. Cheers!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    Hi there, haven't checked the backlights, but as i saw this burnt IC, i hope it's the only problem! :-D

    How can i post pics here? Jee?

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    What a good explanation Benimur! Thank you very muchhhh!!!
    This last stage schematic reminds me to a Class A/B output stage of some tube amps i've built, with transformers and all, :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008

    They're on the way!! :-D

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 30, 2008
  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 31, 2008

    Grrreeeat jee!
    I'll check the voltage later. Any idea of where can i get this IC?
    Cheers and thank you!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 31, 2008

    Thanks Vambiaka. Yes, it's been very positive, i didn't know anything about LCDs before, and now i have some ideas and concepts!
    Thanks to all you wise guys that helped!!! ;-)

    PD: It's not under warranty i think. It's a friend's monitor, but gotta ask. Cheers!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 31, 2008

    Hey Jeeeee!!
    Thanks again for the help!! Any of those would work here? Or should i check dimensions and datasheets?
    Have a nice end of the year and a better begining of the new one!!

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 31, 2008

    What rezister?

  • Ekaitz Garmendia
    Ekaitz Garmendia Dec 31, 2008

    Thanks jee.
    I'll seek them and find one somewhere.
    Anyway, i have a last doubt. Even this IC is not working, the other three wouldn't have to work and make the other backlight work at least? And there would be maybe a bit of light on the screen?
    Cheers!!

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23 Answers

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SDM-HS73P can not be repaired on component level being LCD monitor because parts are not available.
Problem seems in G board (Inverter Board) and you can get replacement from Parts Store

G board part number is as follows...

A1410596A G MOUNT

Here is an image of related service manual page..

Hi there!! Sony SDM-HS73P Problem - 7fc9486.jpg

Posted on Dec 28, 2008

  • 18 more comments 
  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    G Board schematics are not available even in Sony so I would advise to replace board.
    Regarding its worth, you are judge to evaluate as we are tech experts and offering you technical info only and that what we do on Fixya.
    G board would have many caps and semiconductors as well. Please check semiconductor parts too as every problem is not caused by caps only.
    In my opinion, component level repair is not possible in LCD monitors / TVs and its also advised by manufacturers.




  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    As you said, it has circuit mark TH110, it means its negative thermistor and should give low resistance near to zero.

    Positive thermistors give little high resistance approx 5 to 22 ohms normally and increased resistance up to very high on current supply, for example posistor (PTC) used with degaussing coil in CRT monitor.
    In Sony terminology, THP used for positive thermistor and TH for negative thermistor.

  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    to Ginko..
    G Board idea is not rubbish and its to the point.
    See below exploded image of board layout and board name...



    A board (you said it small board) is digital processor, syscon and input board.
    Below is source of info... image of related service manual which is Exact and Not Similar.
    It is quite possible you have not seen yet such G board which has inverter circuit too but I'm giving reference of Service Manual.




    All above is just for your kind information only.
    Thank you.


  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    This is not good idea to suggest solution on based of similar model service manual where as exact service manual is available and can be downloaded Free from HERE.
    If an expert insist on Similar Model service manual solution and doesn't believe on Exact model service manual info then I must stay far away as I can not be part of damage of product.
    My fellow expert has already claimed key control board as compatible inverter board and advised to replace it. Sir, your advise is confusing not even user but me and other experts here too.



  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    My question is, what is inverter board?
    Why it can not be on PSU board?

    Designer never ask me or others like me, how we design our product. I / we have to learn and get knowledge from designer's designed product and its related technical documents.

    Here is my suggestion, I would request to user Ekaitz to please post image of rear side of monitor for understanding boards layout. Upon image evidence, I will admit that I have wrong service manual of SDM-HS73P and will apologize here.



  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    Ginko,
    below is magnified image of rear layout and you can observe AC input wire and its connector on PSU and connectors of back light as well.

    Camera snap of product will help us to understand it better as I requested Ekaitz to post here.




  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    Thanks Ginko for understanding.

    All above info was provided only because of these comments...

    " I think the G board thing is pure rubbish and is messsing up the whole solution.

    On
    the diagram for a similar model posted by welcomejee the inverter shuld
    be the small board connected to connector number 8 it has no number.
    I
    think he G mount published by welcomejee has nothing to do with this ,
    not even the G board in my opinion has anything to do with this. "

    Thanks again.


  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    I also have SDM-HS74 and SDM-HS75 manuals...







  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    check power supply voltage goes to inverter section because monitor has no back light and this is the only issue.

    you can check fuse-able resistor or fuse at source of inverter supply volts.

  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    No need to check primary stage of power supply, just stay in secondary section and find power source of inverter out chip.




  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    can you measure AC voltage on inverter out connectors?
    can be approx 300 plus



  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    Pink cables going to CCFL inside LCD Panel.


  • Shahid Electronics
    Shahid Electronics Dec 29, 2008

    humm, you love this component level repair... I would love to get clear snaps of board (top and bottom view) now to guide you further.

    working with Sony, I follow instructions of Sony and instructions are Do not repair these boards :D

  • Shahid Electronics
    Shahid Electronics Dec 30, 2008

    board snaps are still awaited :)

  • Shahid Electronics
    Shahid Electronics Dec 30, 2008

    Ok, below image is marked with +B 12 volt supply line to inverter board.
    Damaged IC is also required.





  • Shahid Electronics
    Shahid Electronics Dec 31, 2008

    all I get whole-sellers data when I search for subject IC.
    No part store is found yet to provide that IC

  • Shahid Electronics
    Shahid Electronics Dec 31, 2008

    here you can see all companies located in China region for IC 4501M

    http://www.ic2ic.com/search.jsp?sSearchW...


  • Shahid Electronics
    Shahid Electronics Dec 31, 2008

    Now you got all info about inverter problem in monitor including defective parts.
    Here you need to do little search for IC 4501M availability because its China origin part. Also check eBay some thing for subject part.
    I already said that repair on component level is very hard and some times not possible due to part unavailability.
    Good luck.

  • Shahid Electronics
    Shahid Electronics Dec 31, 2008

    do you see big IC as Oscillator or controller with these 4 small ICs? that controller get reference signal form output of 4 small ICs that every thing is OK. When there is some input missing, it shut down the oscillation to avoid further damage.

    This is the cause that you do not get out put on second part of back light inverter. Both inverter circuits are not independent and being controlled by one big chip on board.

    Hope doubt is cleared now :D

  • Shahid Electronics
    Shahid Electronics Jan 06, 2009

    I hope you are watching that monitor :D


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Please contact our resident SONY expert at this link:
http://www.fixya.com/users/mistersony

Posted on Dec 31, 2008

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  • 505 Answers

Sounds like the rezister

Posted on Dec 31, 2008

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Hi Ekaitz
I wish the long discussion here with our expert is really helpful as you yourself are an Electronic Engineer. Well If you consider taking it to the Company if its having a warranty, they will repair it free of cost for you. That way you can Fix and Learn some more!
Best Luck!

Posted on Dec 31, 2008

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  • 56 Answers

Hi sir have you checked your backlights? it might be not functioning have it tested or replaced and also the data electrodes make sure it connects properly to its proper slots..

Posted on Dec 30, 2008

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I'm thinking more that the backlight fluorescent bulb is weak or burning out.

Posted on Dec 30, 2008

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  • 46 Answers

Greetings,
Check the Brightness and Contrast settings if you can see them throught the grey. Attempt to do a reset from the menu. If this does not work chances are that the backlight has gone out on the monitor. This is something that can be repaired but in most cases it is cheaper to replace the monitor. This replacement should only be attempted by someone that has proper training on monitor repairs.

Posted on Dec 29, 2008

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Are u looking for me

Posted on Dec 29, 2008

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Most likely the problem lies in the power supply, to be specific the rectifying circuit. if you can replace that and/or the voltage regulating circuit you probably fix the problem.

Posted on Dec 29, 2008

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  • 177 Answers

You probably won;t accept this request but, Take it back to the place you bought it from or call the manufacturer as tey will happily replace it if it is under warranty.

It sounds like the Backlight is gone!

--P3NGYJ03

Posted on Dec 29, 2008

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Hello,

First I would suggest that you get a schematic and check the voltage levels to the back-light and the inverter. Once that is done it should point you to which voltage rails are having the problem. In addition I would look for capacitors that seem to be bloated, this is due to a failure of that capacitor. This should take care of the problem is it is a capacitor issue. If it is not try to look for the circuit that turns on the back-light, and see if its voltage levels match those on the schematic.

Let me know how this turns out.

Thank you,

Shuttle83

http://www.electron-age-technologies-llc.com

Posted on Dec 29, 2008

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  • 201 Answers

HI there, let me try to help. Its difficult to give you advise when im not there sitting with your screen and multimeter to test it. You definitely have a power supply problem, the reason for it to go on and off very quickly is because of a possible short circuit component. Check following.

  1. Op to coupler, this switches your primary power circuit on and of when theres a problem
  2. cHeck the secondary diods sitting next to the mains transformer, look for a schort circuit one
hope this helps

Posted on Dec 29, 2008

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  • Master
  • 365 Answers

Changing the power board will surely solve your problem .the power board may be available in the store of sony itself and go for that first.the site is provided here: http://servicesales.sel.sony.com/
change the power board and have the picture clean.thank you

Posted on Dec 29, 2008

  • JITHIN ANTONY Dec 30, 2008

    at last you find out what the real problem is,congrats .

  • JITHIN ANTONY Jan 05, 2009

    does the problem solved



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  • Sony Master
  • 19,396 Answers

Hola Ekaitz, the contesto el resto en Ingles.

I quote from you:

"When i turn the PCon, the ON/OFF light blinks intermitently green, and there´s no imageon the screen at anytime. But looking at the screen carefully, irealized that there is the image already, but it's flashing, and nobackground light of the screen."

That means that either the lamp , the inverter board, or both are faulty.

The inverter board is a small power board, that provides high voltage to the back-light lamp , the symptoms are un-mistakenly addressing the inverter board.Hi there!! Sony SDM-HS73P Problem - spellcheck.gif
Inverters transform DC voltage to AC voltage, and they are needed for controlling thelamps of the backlight, providing high voltage alternate current to the lamp (on Sony it is a double fluorescence AC powered lamp).


If you are used to open and assembly electronics, replacing an inverter is usually a not-too-difficult operation. If you have not done a similar repair before, remember to observe strictly the safety rules, and that there is always a chance to damage the unit.

The board is connected to the control board on one side, and to the lamp on the other.

This should be the compatible part, call the seller to ensure that it mounts HS73, as it is listed for HS93, both monitors should mount same inverter, verify with the seller.

9a890fe.jpg


Here is the seller page.


Alternatively contact Sony Direct Accessories & Parts Center

Let me know how it goes.

Thanks

Posted on Dec 28, 2008

  • 7 more comments 
  • Ginko
    Ginko Dec 29, 2008

    Hey, there, I was not guessing, from description this is a faulty inverter or lamp.

    The components must be tested with a multimeter, and and the faulty one replaced.

    I charge part price + £.40 to do this job, and do at least one per week.

    Only rarely this is due to connectors and wiring problem, usually this is lamp blown (just read continuity) or faulty inverter.

    Regarding the inverter, this costs about $15, that is 12 euro or so, and not $140.
    The part must be tested using a multimeter before replacing it.

    Good luck


  • Ginko
    Ginko Dec 29, 2008

    El inverter es una placa pequena situada atras del display, y se enchufa a la placa principal (D board).



    Por lo que se la G board en Sony es el PSU (placa de alimentacion).



    Cuando es el G board el problema, el monitor ni se enciende. Cuando es
    el inverter, la tele o el monitor arranca y la pantalla se queda negra.



    El inverter esta tambien conectado a la backlight lamp que puede ser defectuosa, la bombilla cuesta como 5 o diez euros.



    El inverter y la bombilla suelen ser de dificil aceso.



    Para no pligrar de romper partes (ribbon cables) you aconsejaria cuemprar el manual de servicio.



    Lo deverias de encuentrar aqui a un par de dolares:Sony - SDM-HS73P



    O los puedes pedir a Sony, y cuesta como 20/30 euros.



    Como siempre tengo que acuerdar que lost trabajos deben de ser hechos
    para un tecnico, y esta consulta solo tiene valor informativo.



    Si mis comentario fueran de ayuda, no te olvides de aceptar mi solucion.



    PS: el espanol lo aprendi de mi mujer , que cuando se enfada me llama de todo.



    Q tenga suerte.

  • Ginko
    Ginko Dec 29, 2008

    To all experts.

    Can you either support your information with diagrams, or stop posting non verified information.

    I havent seen any monitor of this kind with inverters on PSU board (G Board).

    I think the G board thing is pure rubbish and is messsing up the whole solution.

    On the diagram for a similar model posted by welcomejee the inverter shuld be the small board connected to connector number 8 it has no number.
    I think he G mount published by welcomejee has nothing to do with this , not even the G board in my opinion has anything to do with this.

    The first thing to do is testing the backlight lamp, that is the most likely, if the lamp is fine replace the inverter.

    If the lamp is powered by PSU (no need for inverter, PSU is AC already on part of the circuits) then give evidence , please.

    Thanks all.


  • Ginko
    Ginko Dec 29, 2008

    Like any other similar display, this monitor has an inverter board, it costs about $15 and must be replaced.

    I am very disappointed with experts addressing others and tell the user ask welcomejee or ask benimur, as this confused the user and caused me more troubles in troubleshooting. Because of you all quoting same bad solution (and in this way discrediting mine) it costed me three hours job, and user is still confused.
    This cause me more problem than regular bad solution.
    I will be grateful if you do not address users to other experts unless asked by the user in the future. Thanks.

    Here is the service manual, for free, on a multipart download.

    Aqui tiene el manual de servicio, descargue las tres partes y descargar winrar para decomprimir:

    http://www.4shared.com/file/47840904/178...

    http://www.4shared.com/file/47840958/75b...

    http://www.4shared.com/file/47840999/ae0...







  • Ginko
    Ginko Dec 29, 2008

    Thanks welcomejee , I was not upset with you, but disappointed by the confusion enforcing each other solutions without verifying.

    That makes things really troublesome, as you get discredited, being one against three.

    Dont give reference of service manual cover, post it, models 73, 74, and 75 are nearly the same inside.

    And you do not see the inverter on the assembly diagram because is protected by a cover.

    I am on holidays and I do not have Sony CD here, but I am still curious and want to see how comes that this single model does not have inverter, I think you just read wrong SM. That can happen.

    What is wrong is saying Ask Ginko or Ask Benimur etc. when many experts are active, this can crumble your troubleshooting, as it happened here.

    This is a faulty inverter, faulty lamp, or bad wiring, unless some of you guys show me a diagram with a backlight lamp controlled by main PSU board.


  • Ginko
    Ginko Dec 29, 2008

    Hi Jee, I start seeing the confusion here:





    If this is coming from service manual that is the mother of all headaches.

    The board indicated asw G board that connects to the backlights is an inverter (just an inverter) and not a PSU, you can see the oscillator circuits similar to any other inverter, and is controlled by LCD controller board (A board).

    That is just an inverter, and not a PSU.

    No matter if Sony called it Gboard on this SM , or in general, that is not a PSU, and does not cost $150 (ranges from $15 to $50).

    Thanks for coming back with detailed information, the publication of wrong part, and the other experts saying that the inverter is inside the PSU where confusing the user more than buying a G board without knowing that is an inverter.

    Before replacing the inverter (call it g board if you like) the user must test connectors and backlights.


    The inverter can be purchased calling Sony Direct Accessories & Parts Center and telling them that you need a G board or an inverter for this model, better ordering with part number.

    Thanks all.



  • Ginko
    Ginko Dec 29, 2008

    Thanks jee, I already understood the problem , the inverter is just called G board (Sony loves generating this kind of confusion).

    Regarding your query,





    Inverter takes power from a DC circuit and generates AC power, controlled and stabilized by oscillator, main and trasformer sections.

    In inverter does the opposite a PSU does.

    We do not connect LCD backlight straight to PSU because we need to control voltage to backlights, using the main board (digital board or controller board, mainboard on laptops), and this will be impossible or too complicate if we power backlights from PSU.

    Thanks to the confusion on G board here we have had several of our best experts on this thread, hope only that mayassistiu is not going to score here. I think we all did a good job now that the problem is cleared, thanks welcomejee and benimur.

    I think welcomejee gave best contribute on this thread.

    Addressing the user toward using ask me on experts can still be a problem, and in my view should not be done if not on user request. It is a while since I want to point this out.

    Have a nice day all.



  • Ginko
    Ginko Dec 29, 2008

    Hi jee, that cable is not carrying ac power. That is connecting to lcd control. I think limp is powered by a small cable at the back.

    this monitor is the only one I have seen with this system, Sure if you have to replace this stupid G board this must be considered beyond repair.

    On all other Sony I have seen , sony calls G board the PSU, and inverter is separate.

    I think this problem took already too much time, at least I have got it clear now, sure if you can watch inside the monitor, you understand how it works in five minutes. I will save myself that five mins now that I know how it works.

    I think it took a while to get along together, but we all did a good job. Welcomejee was first to find solution, and benimur was somehow right in saying that inverter was inside psu, as they are on same board.

    Confusion is cleared now, I gotta go.

    Bye all.



  • Ginko
    Ginko Dec 30, 2008

    If the board is defective it must be repaired at component level, and this can be quite complicate, and the replacement too expensive, but the problem is not necassarily the board.

    Testing the inverter requres a test on the voltage out , that is 500 V to 700 V, this is a risky operation that must be done following all safety rules.

    Then you test voltages to the inverter section of the board, this are coming straight from the video control board through the cable.

    There is no diagram on service manual to test the G board , that means that they consider the part not serviceable.

    Test all cables and connectors, particularly the connector to video control board on the right, if you are lucky you have a problem in there , otherwise it may be a difficult repair.

    I will be away for some time, I am in Spain, and flying away right now, see you guys.


    Y a ti, que to te quejes de Fixya, me parece que tienes un buen equipo que te va a asistir, pregunta a jee y a beni.

    Suerte.

    Apart checking the board

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  • Master
  • 827 Answers

Hola Ekaitz,
Some of the can type capacitators bulge and go 'rounded' when they go bad. If you find they are bulging and rounded, solder new capacitators in.

Try replacing the smaller 470uF ones first, and then try the monitor before you replace any others.

¡Buena suerte!

Chris (ziraffa)

Posted on Dec 28, 2008

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  • Master
  • 837 Answers
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  • Master
  • 2,920 Answers

Check each of the 4 corners of the monitor.there should be 4 caps one in each corner see if any of them are popped up if so they need replaced. if they are still flat on top they should be fine. you can tell if one is popped or not but the top surface of it being either flat or rounded

Posted on Dec 28, 2008

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  • Master
  • 679 Answers

Replace the power board, it's the same amount of work and you may miss a bad ic on the board and end up wasting your time just changing the caps. good day

Posted on Dec 28, 2008

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  • Master
  • 6,966 Answers

Hi and welcome to FixYa,

Initially, it is highly recommended that a service manual be referenced to remove guess work from the repair activity. With the said service manual, if you are considering component level repair, then a more realistic diagnosis could be performed. If however, you are considering board replacement, then this page may be of possible source for boards.

If you are planning on "winging" it, then foremost to do would be visual inspection of the components particularly the capacitors. Defective/leaky capacitors would show their top to be burst and the opening to the top of the can parted.

Good luck and Thank you for using FixYa.

Posted on Dec 28, 2008

  • 14 more comments 
  • Louie  Role
    Louie Role Dec 29, 2008

    Of course an alternate possibility is the video card of the computer is the issue.

    Have you tried another monitor on the PC? Or have you tried the Sony monitor in another PC? Presumably, there is another PC since you can go online. Even if the 2nd computer is a laptop, normally it would have provision for an external VGA connection.


  • Louie  Role
    Louie Role Dec 29, 2008

    Hi again,

    One of us who responded (but you have not viewed yet) is with Sony. Though we offer differing opinions on how to address a problem, we do also collaborate to provide you, the user, with the best possible solution.

    Pls look for the posting of welcomejee. Alternately, pls click here to directly post a question through his "Ask Me" feature.


  • Louie  Role
    Louie Role Dec 29, 2008

    Your post "The component TH110, which aparently looks like a green cap or something,(on its pins it says E9 and E10 on the PCB), it's resistance zero, short." could possibly be a thermistor if it looks like the image below.

    Its resistance would change depending on the temperature and should not read as a short.

    Another possibility (though a bit remote) is a varistor which looks like this.

    Its resistance would change depending on the voltage and should not read as a short.



  • Louie  Role
    Louie Role Dec 29, 2008

    SCK 054 is a thermistor and it should not be shorted. Pls click here for its datasheet.

  • Louie  Role
    Louie Role Dec 29, 2008

    for Ekaitz and welcomejee,

    Pls confirm:


    • G board is the LIPS? Board # 1-789-184-11 power supply integrated with the inverter?

    • SDM-HS73P is on Chassis CL-42.
    Looking forward to your updates.


  • Louie  Role
    Louie Role Dec 29, 2008

    Great!

    6871TPT241D is an LG/Zenith board. Would there be a C207 on that board?




  • Louie  Role
    Louie Role Dec 29, 2008

    Would this be a fair representation of how the rear of the monitor looks like?



  • Louie  Role
    Louie Role Dec 29, 2008

    and my copy of the service manual.



  • Louie  Role
    Louie Role Dec 29, 2008

    Would this be your board?

    If it is, it is a combination Power Supply Board with
    The original part number is 6871TPT241D. It has been replaced by 6871TPT237G

  • Louie  Role
    Louie Role Dec 29, 2008

    That should be:
    If it is, it is a combination Power Supply Board with Inverter.
    The original part number is 6871TPT241D. It has been replaced by 6871TPT237G.

    Incidentally, pls inquire from here for availability.


  • Louie  Role
    Louie Role Dec 29, 2008

    That should be:
    If it is, it is a combination Power Supply Board with Inverter.
    The original part number is 6871TPT241D. It has been replaced by 6871TPT237G.

    Incidentally, pls inquire from here for availability.


  • Louie  Role
    Louie Role Dec 29, 2008

    sorry for the double post...

    BTW, have you checked for the presence of C207 and if yes, is it good?

  • Louie  Role
    Louie Role Dec 29, 2008

    Hi again,

    For starters on voltage measurements:


    • the output of the power supply would be +5 and +12 (those going out to the other boards);

    • the output of the inverter would be high voltage/high frequency for the CCF (cold cathode florescent) lamps.


  • Louie  Role
    Louie Role Dec 30, 2008

    A couple of new ideas/requests:



    • we have established that the board in question serves 2 purposes, power supply and inverter;

    • we need to determine if the inverter is receiving DC supply from the powersupply half of the board. Could you measure any DC voltage on the inverter. Actually anywhere but preferably on the 2 X 2 capacitors top of the heatsinks;

    • could you pls post back the part number of the IC top center (must be something like LX1686 or ANP005.

  • Louie  Role
    Louie Role Dec 30, 2008

    Pls reference below partial schematics. They may or may not be 100% representative of the inverter circuitry that is in the Sony SDM-HS73P. However, they should be sufficient to lead you the way.

    For the BIT3105P/FGP57G0348 - 20PIN High Efficiency ZVS CCFL Controller:

    For the 4501M/407033 2Amp, 8PIN 2MHz Step-Up Switching Regulator with Soft-Start:



  • Louie  Role
    Louie Role Dec 30, 2008

    An inverter as earlier posted is a DC to AC converter. The specifics however are that the AC is high frequency and high voltage that it would be able to trigger the CCF Lamps to glow the soft white radiance.

    To attain high frequency, the inverter would need an oscillator. This is the BIT3105P which also serves as the controller To achieve high voltage, the oscillation must be amplified. This is the function of the 4501M. The analogy would be like the HOT (horizontal output) of a conventional CRT TV.

    The 4501M is described as a 2MHz Step-Up Switching Regulator with Soft-Start. 2MHz would be high frequency, step-up would be amplification. Switching Regulator with Soft-Star would just be in line with switch mode power supply description/operation.


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  • Expert
  • 100 Answers

Mostly the caps internally will be bulged or blown off and looks like burnt interrnally.or got leaked so you can easily locate the faulty.

Posted on Dec 28, 2008

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  • Sony Master
  • 13,433 Answers

Hi, can you tell me the name of the expert you where trying to get in contact with? I will try to contact him and get him to give you advice.

Posted on Dec 28, 2008

  • Ekse Dec 28, 2008

    Hi,


    sorry to say the expert is no longer active on the website. Benimur on the other hand has already posted a detailed solution for you, go with hes advice.


    press the repost button again and find Benimur!

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  • Sony Master
  • 60,792 Answers

Scrap it and buy a new monitor, they are cheaper than what it will cost to fix this one, 19" are units going for $99 US.

Posted on Dec 29, 2008

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1 Answer

Monitor sony sdm hs73p come black in few seconds


This SONY series are known to have bad lamp assemblies due to poor workmanship.
http://s807.photobucket.com/albums/yy352/budm/SONY/Sony%20SDM-HS73/

You need to also check the caps in the power supply, etc.

Basic LCD monitor and TV troubleshooting guide:
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