Question about Philips 170B4MG 17" LCD Monitor

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I AM A RETIRED TV ENGINEER (FOR THE LAST 50 YEARS) IHAVE A 170B4BS/02MONITOR WITH POOR /NO START UP. THE ALWAYS 12 VOLTS HUNTS IN STBY 4 V TO 12 V. ON A GOOD PSU IT IS 12 V.HAVE CHECKED CAPS (ESR) AN

  1. PSU FAULT
  2. PHILIPS 170B4 17"MONITOR

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  • sawraj May 11, 2010

    if it is IC 3842 supply check dirve comming on the anode of the fet6N60

  • satinwolfe May 11, 2010

    What are the symptoms?  If the monitor comes up with an image for a short time, then goes black, it's the backlight inverter.  I got around the problem by bypassing the overcurrent trip.  I suspect that the CCFL tubes draw more current as they get old, and trip the inverter.  The backlight on the monitor I hacked is usually not on, so it's not a problem.  For a more permanent solution, I can suggest a new inverter or if that doesn't work, new backlight tubes.

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Hi
I have the circuit diagrams...can you tell more about your hack, please?
Thanks
Peter

Posted on Feb 22, 2011

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The last several days when I turn on my monitor the image is extremely scrambled for the first few seconds after it powers up. It seems to be taking a bit longer each day for the image to unscramble. Once...


It may have dying power supply due to bad DC filter caps in this 4 years old momitor.
If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

Mar 03, 2011 | Soyo DYLM1988 Monitor

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My NEC 1765 will not turn on. Has always worked great. Recently I turned it off and an hour later when I turned it on it would not turn on. I have checked the power and it is correctly plugged in. How do I...


Hi. I hope this info helps you out today.
Flat screen displays such as this have a real bad problem of the capacitors going out without notice.
There is an overwhelming abundance of cheap, low quality capacitors on the market, and ALOT of these have been installed into flat panel displays and flat tv's.
The capacitors should last around 25 to 30 years, but are only lasting as short as 6 months instead.
Some of them fail because the formula used to make the gel inside the caps is incorrect, some are failing due to poor quality casings that fail , some due to poor soldering, and some due to poor quality control.
Cheap quality is ruining millions of peoples experience with flat tv's and monitors.
It makes them think that ALL flat panel's are junk, and that's just not the case.
A vast majority of them are just fine, but if it's one that has the defective parts inn it, then it can be frustrating.

Yes, it can be repaired, but it may be a cost prohibitive procedure, as it can cost as much to fix it as it would cost to just buy a new one.

If you want to try and get it fixed, then take it to Fry's or BestBuy.
They both have special service techs for just this kind of repair, as they have had specific training to do the needed repairs.

I hope this let's you know what the deal is, and gives you options as to what to do.

Feb 27, 2011 | NEC MultiSync LCD1765 17" Flat Panel LCD...

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I need an internal pin out diagram for a 4 Pin connector to connect power supply to a hp pavillion f70 monitor. I do have a power supply with same specs but it has a normal plug with outer as +ve and Inner...


12 VDC , 4.16 A (4,16 A) Frequency: 50/60 Hz Power Consumption: less than 36 W in operating mode.
I think the other two pins are not used. It just requires the 12 Volts DC. +ve and -ve, positive and negative, respectively.

Feb 10, 2011 | HP Pavilion F70 17" Flat Panel LCD Monitor

1 Answer

I bought a sva montior and it was new i had it 3 years and it went out i have never had a monitor only lasted 3 years what can i do thanks email ellenpatrick2002@yahoo.com


You are lucky that it lasts 3 year, I just worked on 2 years old 32" SAMSUNG that already went out due to bad caps and bad main board.
Your monitor is more likely to have bad caps by now. As you will see the pictures in my albums of failed TV and monitors, it does not matter what you buy these days.
If you are going to DIY and already try the monitor with another PC, and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/albums/yy352/budm/
Post back what you see inside so we can guide you further and it will help out other people in the future also.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors: http://s807.photobucket.com/albums/yy352/budm/

Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

Or www.digikey.com just make sure to use caps with low ESR, 105c, high ripple current, long life rating such as PANASONIC FM or FC series.
Please leave rating if it helps.

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1 Answer

Hello, i have a problem regarding my aoc screen.. its old, at least 4 years old, but since last year i started to periodically show "shadows" of words or pictures going to the far right. what can i do to...


If you really want to DIY repiar this monitor, then first palce to look will be bad caps with bulging top/bottom seals first.
If you are going to DIY and have proper tools and know safety precaution then please read on:
Most common failures in the LCD monitors are bad capacitors (bulging top/seal or leaking) in the power supply (they should be replaced in a set), blown fuses; poor solder joints, failed inverter circuits (blown fuse, shorted transistors, shorted/open transformers), bad lamps (poor solder connections or worn out lamps). You will need to open it up and inspect the inside, see example of failed monitors to get some ideas what to look for: http://s807.photobucket.com/home/budm/allalbums
Post back what you see inside so we can guide you further and it will help out other people in the future also.

http://en.wikipedia.org/wiki/Capacitor_plague

Capacitors kit: http://lcdalternatives.auctivacommerce.com/ he can make you a set of caps for you.

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2 Answers

Started today, while working on the computer, twice my monitor went Black. I turned it of and back on and it was okay then. Connections are secure. Also for a long time when I boot up --just once in...


Ellie1239, Always state the year unit was manufactured found on rear lable. Retrevo. com lists unit as "time to retire"!!! If that not good option, then unit may need to have it's internal "switch-mode-power-supply" investigated (troubleshooted) to see if it needs to be refurbished with NEW electrolytic filter capacitors!! If a "known-good" monitor works perfectly with your PC, you should then visit YOUTUBE for video clips of "lcd monitor disassembly" and "lcd monitor repair" and pay particular attention to the industry problem of BAD CAPACITORS and POOR quality soldering. Your unit could suffer from either or both of these RAMPANT problems!!! Find out all you can about the BAD electrolytic filter capacitor problem!! You will be amazed at the "hits" you will get on a search for "CapXon"!!! Any way let me know what you want to do next. 12fixlouie

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Power light on and off


Hello, I am glad that I can help you.

This problem is often at Hyundai L72S LCD screens, You have to open the Monitor, You have first to disconnect 4 H/V connectors and 5 buttons mini board also you have one large flat connector connected to the LCD screen, inside metallic box are 2 boards, one is power supply other is signal video controller, the problem is in power supply, there are two version of power supply both of them after about 2 to 3 years have a problems, in your case the problem the Electrolyte condenser the number in on the board is C118 the value is 47µF (micro Farad) , 50 volt, when you replace you have to use same capacity 47µF voltage should be 50 volts ore more example, and you have to pay attention on polarity not to reverse.
Best Regards
Latif Berisha,
KOSOVO
latifberisha@gmail.com

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They are;
4x 470uF 35v, and
2x 1000uF 16v.

I recommend the following replacements if you are in Australia (the ones I purchased from Jaycar only lasted 12 months);
(470uF) http://www.altronics.com.au/index.asp?area=item&id=R4865
(1000uF) http://www.altronics.com.au/index.asp?area=item&id=R5182

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This problem is very often caused by dry electrolytic capacitors on the inverter board. If you have some skill with soldering you could try to change them. When buying new ones ask for LOW-ESR capacitors for switching mode power supplies (SMPS) and 105°C, they are a little bit more expensive than normal electrolytic capacitors, but are designed for this aplications so they lasts more. Normal el. caps will also works fine so when you cannot buy LOW-ESR for SMPS use normal ones.

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