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Dear Sir, I have a Technica LCD 19" with the Number LCD19DVDID-108. When power is applied the standby light comes on and glows steadily. When the 'On' button is pressed, either on the controller or the set itself, there is a very faint 'click' in the speakers indicating power has reached them and the standby light begins flashing slowly (about 1 Hz) and does so indefinitely until power is disconnected. The screen back-lighting does not come on. I have tried two replacement power boards (part No. LS1502057A-18-GP) with the same result. Unfortunately the parts supplier (ShopJimmy, an excellent company) does not have a replacement main board to hand. Can you suggest where the fault is likely to be (main board - part No.PLV3117D-EMC-2 - 94VO R28 033-P3117DW105; screen - MindTech Display M190MPW1 - Board IM190WE1-XPCB - Serial No. GW1908A1A083RJ2565; elsewhere?). Any advice or suggestions you can offer would be most welcome. I would very much like to repair this set as, being on a pension, I cannot really afford to buy a replacement. Thank you most sincerely. Rick Chattaway

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  • 3 more comments 
  • Thank you for your advice. I had already checked the capacitors and none have bulging ends, they all appear OK on my original board and on both the supplied replacements. As the supplier pointed out, it is unlikely that both their replacements were faulty as they were both taken from working sets, this is why I feel that the fault lies elsewhere. It would seem that my only option is to replace the main board and, if that doesn't cure the problem, replace the screen, which also has a board built-in. All the electrolytic capacitors visible on the main board appear OK, otherwise I would have immediately replaced them.
    I would be most grateful if you have any other suggestions to offer as the cost of a TV serviceman would likely exceed the cost of a replacement set!
    Thanks again for your help.
    Rick Chattaway

  • Thanks for your advice, friend. I have checked the power board, all capacitors are OK (not bulged) and have tried two replacement boards from ShopJimmy with the same result, that's why I deduced the fault must lie elsewhere (main board, LCD screen, etc.).
    Thanks again,
    Regards,
    Rick

  • Thanks for the suggestion, I do know how to use a meter but haven't (so far) attacked the main board as I don't know what voltages to expect at various points. The standby light (and IR receiver) is on a separate board fed from the main board and as the standby light and the controller both appear to be working OK power must be getting to the main board. One half of the power board is specifically for the screen back lighting and since the back lighting fails to come on I assumed the fault lay there and that the software detected this and does nothing except flash the standby light. Two replacement power boards didn't solve the problem so I assumed the fault must be elsewhere other than the power board. All electrolytic capacitors visible on the main board appear OK (not bulged) and there's no obvious problem (signs of burnout, etc.) and all connectors appear OK. A circuit diagram showing voltages would be a great help if anyone knows where one might be obtained.
    Thanks again,
    Rick

  • Hi, Ginko,
    Thanks for your advice, I will certainly have another go as one thing I wasn't aware of is that I should disconnect the DVD before testing! If that fails I will be removing and replacing each electro cap one by one to see whether that cures the problem. The 'TCon board' has been mentioned a couple of times but I'm not sure what that is; there's the power board, a main board, a separate button board (with the LED and IR receiver -- which appears to work properly) and an inaccessible board attached to the LCD screen that I am reluctant to mess with. The back lighting is powered from one half of the power board that is marked off by printed lines from the other half and labeled with 'High Voltage' warnings, it has two twin-wire outputs that go to the LCD screen, the screen board is fed by a multi-pin connector from the main board, as is the button board. I will work through as you have suggested although that might take me some time as I have to journey into town to buy capacitors! I will let FIXYA know if I have success.
    Thank you again for your help.
    Rick

  • Thanks for your encouragement. I will investigate further and if successful I'll certainly post the results and what the fault was to FIXYA.
    Thanks again.
    Regards,
    Rick

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3 Answers

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Hi Rick.

The flashing led and the forced standby just mean that the TV is in protect mode because an internal fault has been detected. This is not necceraly pointing at the PSU, but just saying that there is an internal problem. The "bulged capacitors" have became almost an urban legend on the Internet, mainly because of the many prophanes that do not have experience in repairing TVs and electronics and that keep giving technical details online (well, sorry but that is the truth). Even when the LCD TV PSU is faulty you see "bulged and leaking capacitors" only in few occasions.

When the TV is in forced standby the TV must be tested thoroughly. I start testing from PSU, reading volts to inverter through the main digital controller board. This test will find the fault most of the time. In some case you do the same volt tracking with the TCon board. You also check connectors solder joints to ensure that there is continuity (soldering is good), and you check input output connectors and components nearby. In some case check also IR sensor and button board. If TV has cooling fans , check also that the fan are starting.
The testing involved requires reading volts with power on and jumping contacts in pcbs.For safety reasons the operations must be done by a trained technician.
In this case I think the unit is a combo, then it must be tested with internal DVD not connected.

Here description on how to test voltage line from PSU to inverter.

Before disassemblying ensure that you have tested the TV with no connected devices.

Regards.

Ginko.

Posted on Jan 02, 2011

  • Ginko
    Ginko Jan 03, 2011

    Hi Rick.

    About your last comment:

    RE:"I will certainly have another go as one thing I wasn't aware of is that I
    should disconnect the DVD before testing! "

    A defective DVD unit can send TV in protect mode.

    RE:"If that fails I will be
    removing and replacing each electro cap one by one to see whether that
    cures the problem. "
    A: That is a way to proceed. You take a chance, as mentioned PSU is only a common fault and not necessarily the problem. Discharge capacitors by shorting their contacts before replacing, or you risk getting a discharge.

    Re:The 'TCon board' has been mentioned a couple of
    times but I'm not sure what that is; there's the power board, a main
    board, a separate button board (with the LED and IR receiver -- which
    appears to work properly) and an inaccessible board attached to the LCD
    screen that I am reluctant to mess with.
    A: The inaccessible board is probably the T-Con. This is a timing board synchronizing LCD with main and inverter activity.


    RE:The back lighting is powered
    from one half of the power board that is marked off by printed lines
    from the other half and labeled with 'High Voltage' warnings, it has two
    twin-wire outputs that go to the LCD screen, the screen board is fed by
    a multi-pin connector from the main board, as is the button board.
    A: That is the inverter. Testing is mentioned in the tip published in last question (how to test voltage line from PSU to inverter.).

    RE:I
    will work through as you have suggested although that might take me some
    time as I have to journey into town to buy capacitors! I will let
    FIXYA know if I have success.
    Thank you again for your help.
    Rick
    A: Good luck and all the best.

  • Ginko
    Ginko Jan 03, 2011

    Hi Rick.

    You are welcome.

    All the best.

    Ginko.

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  • Master
  • 1,126 Answers

It is a bad power supply, and if you take the back off and look at the power supply module you might find a couple of electrolytic caps that all bad, that will need change out, or just buy a new power supply and that will fix your problem.

Posted on Jan 02, 2011

  • Veril Gillette
    Veril Gillette Jan 02, 2011

    It is a bad power supply, and if you take the back off and look at the power supply module you might find a couple of electrolytic caps that all bad, that will need change out, or just buy a new power supply and that will fix your problem.

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  • Master
  • 6,993 Answers

Hello,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.

I hope this helps.

Compliments of the season.

Posted on Jan 01, 2011

  • Walesarumi
    Walesarumi Jan 01, 2011

    Hello,

    Do you know how to test with meter? Since the power board is okay, then you can test where the power board transfer current to.

    Use a meter to read all areas of the TV and you will certainly find the problem. If you don't know how to use a meter, you could ask some you know to help you out. Doing a job like this with one or two persons can bring a result.

    Good luck.

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