Question about Hitachi 60UX54B/55K 60" Rear Projection Television

3 Answers

No B+. The LED is the only one not lit and I get 45v on most of the flyback solder points

Posted by on

  • 4 more comments 
  • jerad2 Jul 15, 2009

    My Hitachi 60 in 60ux54b/55k went out with a zap sound. The monitoring led's on the main power board all light up except the 120 v B+ led. The red power on light on the front of the set goes out and the red protection led on the power board blinks. I am looking for technical assistance via components to check or information regarding known problems of this type with this chassis. Please ask any additional questions you have to in order to assist me. I have tech background and will be doing the repair myself.

  • jerad2 Jul 15, 2009

    What would convergence board have to do with this problem? Shouldn't B+ be coming from flyback? Are you familiar with this chassis? Thanks

  • jerad2 Jul 15, 2009

    Micro, in addition, I heard a ZAP sound and the tv went out. Cannot see any burnt or damaged components. I am getting 45v readings off of several of the flyback solder points. The only status led not lit is the B+ led. The other 7 lite but when the tv try's to crank up HV oscillator they all go out.

  • jerad2 Jul 15, 2009

    Micro:

    If you have better schematics that I do, the ground terminal on the flyback is 500 ohms above ground. Waiting for your groups reply. There are so many routes to take with this curcuitry that I'm having a hard time isolating a particular area to diagnose. Q777, horizontal output checks OK. Do you have ohms measurements for flyback terminals OUT OF CURCUIT? Let me know.

  • jerad2 Jul 18, 2009

    Pulled H transistor and had same 45v on flyback terminals. Pulled flyback and am going to attempt to check windings. Are you familiar with this chassis? I asked that question before but didn't get an answer. I really need help from someone familiar with this chassis. It has quite a few safety curcuits and the schematic I got online is ****. Any other ideas? Thanks

  • jerad2 Jul 18, 2009

    Flyback has shorted winding. Your technique to arrive at this solution worked very well. Thanks .... good job.

×

3 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Hitachi Master
  • 5,807 Answers

Hi,

with a reading of 45V the flyback is partially shorted have it replaced.

to be very sure of that remove the horizontal output transistor that starts with letter C X X X X

and the voltage of the flyback will rise.

then check the transistor while it is still out from the circuit board, you'll see it is probably good.

you can check the supply to the video circuits too, at that voltage of 45V it might be about say 90v

200v is normal operating voltage

but when the transistor is disconnected , the supply to the video circuits equals the supply voltage


if the supply to the video circuit is Zero or lower than 45 V try replacing the capacitor that is connected to the diode from the flyback pins


hope this helps, thanks for using Fixya!

Posted on Jul 16, 2009

  • Rommel Cana
    Rommel Cana Jul 18, 2009

    hi,

    what 45v are you getting at? say what pins?

    since you have pulled the flyback or if still not, here is just the connection

    the horizontal output transistor being C X X X X is directly connected to one of the pins of the flyback transformer


    from that point it goes inside the flyback to another coil which is another pin say P3 (sample only) . that pin P3 is connected to the B+



    so if you trace the connection or resistance check to other pins you will find that the collector

    side of horizontal output transistor which is the center most pin is directly connected to it

    so we assume it is P2



    the important voltage reading is on P2
    P3


    when all is connected.



    since you have pulled (or still not), you need to measure the voltage at P3 it should rise to lets say 110V not 45V

    if voltage is still 45V being flyback removed, I'm talking about P3 it is still to low to power up the flyback transformer you need to check the diode that is connected to it from the power supply
    check the capacitor too, or have it replace if necessary.

    that diode is the main source of power of the flyback transformer

    if diode is OK
    if capacitor is OK

    the problem leads to your power supply too low , check the main regulator, have it resoldered
    check capacitors too


  • Rommel Cana
    Rommel Cana Jul 18, 2009

    Horizontal Deflection circuits will only operate if:

    a) Power supply is normally OK , at least 110V will work

    b) Horizontal Output Transistor is not shorted,

    c) Flyback Transformer is good

    d) If there is active horizontal oscillator circuits driving the horizontal output transistor.


    Power Supply

    a) if power supply doesn't produce an output voltage of at least 110V it is bad, with or without load

    possible causes might be the output diode from the chopper secondary windings or the capacitor connected to it

    is bad, a good multimeter will do the job
    b) might have faulty capacitor or zener diode from the chopper primary windings section.

    And from the negative of that capacitor all the voltages I'm talking about is referenced from that point.


    all of these might be done with a help!



×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    President:

    An expert whose answer got voted for 500 times.

  • Master
  • 2,777 Answers

Check the B+ and B- connections going into the convergence board. If you don't see any obvious signs of melting / eroding then you will need a whole new convergence board for this unit. It is of course possible to replace the convergence board, should only be a few hundred dollars at most. But first check those B+ and B- connections and make sure they are in-tact, if they are though the problem is somewhere deep inside the board, probably impossible to actually fix.

Posted on Jul 15, 2009

  • Tim Grayson
    Tim Grayson Jul 15, 2009

    Understood, that is a precarious problem alright. As long as you don't see any physical damage you are going to have a heck of a time diagnosing what exactly caused the issue. I am researching on my end to try and point you in the right direction. My colleagues suggested the convergence board since they have seen that cause the B+ indicator to go out even though it's connected to the flyback.

    Will keep you posted here.

×

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 3,513 Answers

Hello,

Thanks for contacting fixya.

As per the breif description of LED not comming up it is the main switch mode power supply, I would expect the repair to be anywhere from $200 for a fairly simple repair , to $600 for replacing the circuit board.

As far as preventing it from happening in the future: buy a quality surge protector for your electronics and unplug them during electrical storms.

Secondly, dust/heat is a big adversary to electronics. Change the air filter in your house furnace 4 times a year to keep dust to a minumum, and dust your house often. Make sure your electronics have the adequate ventilation that they require in their owners manual.
Finally, sometimes you can do everything right, and there still may be a microscopic defect in the electronic components of your TV. They are impossible to identify until the time of their failure. In this instance there is no way to prevent the problem.
God Bless

Posted on Jul 15, 2009

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

3 Answers

I have a Panasonic CT-36hL43G TV that just turned offf while watching it and now the led by the power button blinks one time. Can anyone tell me what this code means or what the problem might be?


i hope your tv is more than 4years old ....... in all CRT TV's or CRT monitors after 4years a component called flyback transformer (see picture ) becomes weak - its work is to supply voltage to tube............. then following are the signs ...
(1) in some TV's only front LED's blinks - no picture no sound.... (2) in some TV's picture comes slowly after few seconds or after few mins or after few hours......... (3) in some TV's suddenly picture & sound goes temporarly & after some time again it appears ...... etc in case of (2) & (3) only flyback transformer needs to be replaced .....100% GUARANTEE again TV works normallyBUT in case of (1)... --------------- YOUR CASE (a) either only flyback transformer gets deffective or (b) flyback transformer & another component called transister ( will be near flyback transformer & its back portion is attached to aluminium metal ) gets defective or (c) along with flyback & transistor -- 3 or 4 more components (resistors, diodes, some times ICs ) gets deffective so replacing flyback transistor is a must .. & to find whether any other component is deffective or not completemainboard has to be checked ....... so if you are a technical person & having expierence in servicing line then you can do it yourself otherwise approach good tv service engineer ........... your TV is really very good one ... so don't think of buying new TV .... just goahead for repairing it it is worth & it works for atleast 2 more yrs....... try this & tell me what happened switch off your TV ... remove power cord from socket ,,,,.ware some mat or chapples to your feet ..... remove your TV's back side cover ......... observe carefully for any physically damaged components .... if you find then don't do anything ... close tv cover & approach tv service engineer ............. but if no physically damaged components are visible then take a suitable screew driver & rotate 2 (or 3) Knobs on flyback transformer in clockwise or anticlockwise direction - very little ( 4 or 5 degrees ) - you have to do this without touching any cable or any part of your tv .......... then fix..... back side TV cover ........connect power cord - stay at a distance & switch on your tv ......... if you get picture atleast for few seconds then in your case only flyback transformer needs to be replaced otherwise complete mainboard has to be checked. to find other deffective component ............. so your tv problem is a harware problem - it cannot be solved using remote control or any buttons on your tv ..... if you are finding difficult to get it repaired then you can remove your tv mainboard with the help of some technician & send to me ...... i will replace deffective components .... & send back to you ....you only have to bare the shipping charges .....it will take maximum 12days (5days - to recieve + 2 days servicing + 5 days to send back to you )....



8_16_2011_10_00_55_pm.jpg

Aug 16, 2011 | Panasonic CT-36HL43 36" TV

1 Answer

Hello, I have an RCA standard definition television. Whenever I press the power button, instead of turning on the red power LED flashes (about 24 times) and then stays lit. There is no picture or sound,...


The High voltage Horizontal output transistor is dead.That the transistor sit outside of the wall of the FBT-flyback tranformer is a black block of plastic with a red wire with a cap hook to a CRT-(tv tube) U have soldering iron,a roll of solders and know basic electronic.The "H" trasistor replaced that and resolders the FBT-flyback transformer,should solved this problems.

Jan 29, 2011 | RCA TruFlat 27F520T 27" TV

1 Answer

Samsung CXM1374 TV/VCR COMBO. The original rmote no longer functions. Changed batteries but still no functions work. Does remote or TV buttons have to be activated to reprogram?


you need to open the cover of your remote control..visually inspect the PCB for any loose connections/cracked board specially the battery terminals...solder any loose connections and if nothing happens replace the crystal oscillator from the remote control it is a square,color orange sometimes blue with a label on it its clock speed in MHZ. it is available at electronics supply store..you can use the camera of your cellphone to test whether the remote is working by just pointing the camera to the LED at the top of your remote once you press a button from the remote the LED should lit...means your emote is working...3rd test the LED/infra red if it is not busted..remove the LED INFRA RED from the pcb and using a multitester analog supply.set the tester to X1 range then supply the terminals positive negative with the test probe there should be a continuity connection and the LED should be lit.

May 20, 2010 | Televison & Video

1 Answer

Have a Hitachi 53sdx89BA Rear Projection TV. Turn on TV and red power light illuminates. No picture, but have sound. Check PC board in back and red led is flashing and green leds are lit. It was working...


Discharged Flyback Transformer. Removed main pc board from bottom of TV and flipped over, no apparent damaged components or blown board traces were found. Noticed a lot of flux in various areas on the board that seemed unusual (maybe TV was worked on before as I bought a showroom demo at Circuit City). Used a plastic screwdriver to remove all flux between connections on ICs, Transformers, Flyback Transformer, and various other components. Cleaned all debris, dust and crud accumulation (TV is over 10 years old and there was alot around the Flyback Transformer) from both sides of board using a lightweight paint brush.
Used a magnifying glass to check all solder joints for possible cold solders and found none. Did the same for Power Supply Board. Checked various ICs and Power Transistors for opens or shorts (in machine) and they seemed fine. Reinstalled boards, said a few Hail Mary's and fired it up.

The protector Led no longer flashed under power and lo and behold I got picture and sound!

I cleaned the lens on the projectors (again 10 years of dust accumulation) did a magic focus adjustment and it works fine!

After reading other fixes, I fully expected it to die after 10 minutes so I left it on all day and against all odds it still works.

What was the fix......Dirt buildup on and around Flyback and other components,,,,,,Flux conducting electricity between contacts on Flyback and other components.....or oxidation on connectors between Power Supply and Main Board.....I don't know.... all I know is that for the moment I saved around $ 300 - 400 in repair bills by doing it myself.

Feb 01, 2010 | Hitachi 53SDX89B 53" Rear Projection...

1 Answer

Almost There


I will open a Sony TV to check it out and will give more info tomorrow.

Aug 23, 2008 | Sony FD Trinitron WEGA KV-27FS100 27" TV

2 Answers

RCA 27V530T Powers up and plays perfect for about 5 min then shuts off


look for cold solder joints on primary side of power supply

Jul 01, 2008 | RCA 27V530T 27" TV

3 Answers

My Flyback is burned, questions!


You can get the flyback at the following link and they will provide free tech support to help you with it as well as instant messageing tech support to help you remove the board and the Flyback wires. Its a very easy repair and it doesnt require fine detail soldering what so ever. You need flyback 259296 they will also answer any question you have by leaving them an email. heres the link.
http://servicemanuals.vstore.ca/

May 26, 2008 | GE D52GW12 52" Rear Projection HDTV-Ready...

2 Answers

PICTURE PROBLEM


Some parts go through a thermal cycle, cold, hot...inspect the heat sinked parts first. Fire up your soldering iron!

Oct 28, 2007 | Televison & Video

Not finding what you are looking for?
Televison & Video Logo

Related Topics:

137 people viewed this question

Ask a Question

Usually answered in minutes!

Top Hitachi Televison & Video Experts

Jaime Hernandez

Level 3 Expert

2315 Answers

The Knight
The Knight

Level 3 Expert

73691 Answers

matt martin
matt martin

Level 3 Expert

1208 Answers

Are you a Hitachi Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...