TV will not turn on, no stanby light, no relays clicking.

Question

LG flat screen 37LG10-UM

The LG 37LG10-UM is a LCD TV with a screen size of 37.0 in and display format 720p

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Ryan Marcotte @ryanmarcotte

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投稿日: 2021年1月19日

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TV will not turn on, no stanby light, no relays clicking.

Model # 50PJ550 (Not the model I picked for the headline but this model wasn't an option)

I have no standby power, no light, no relays clicking when I plug the TV in and hold the power button. I have 120V going to the power board. I tested all fuses, all are good. Diode D304 isn't testing good. I have current both ways. All other Diodes tested good. 2 out of 3 Power relays tested good (I dont have room to test the third) I have no output voltage going to the main board.

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jayeff @jayeff

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投稿日: 2021年1月20日

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Hi @ryanmarcotte ,

Here’s the service manual for the TV which may be of further help. Be patient as it takes a little while to go from processing to Download after you have passed the security test and clicked on Go to Download, below the Document preview box.

I don’t know the TV but you’re sure that D304 is not a zener diode, as these can conduct in both directions? Although normally they are designated as ZDxxx but not always. Just a thought

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From what I understood from comments on another site was that Diode should only let current travel one way, and if tested and the Diode is blown then I need to buy the repair kit suggested. It contains 3 power resistors, that Diode and one other component (I forget the name).

Ryan Marcotte さんによる2021年1月20日

http://www.coppelltvrepair.com/p/639/lg-...

The difference is that I don't hear relays clicking and the screen doesn't turn on at all. No red light either. I do have 120V going to the power supply board, but no output Voltage.

Ryan Marcotte さんによる2021年1月20日

@ryanmarcotte

Fair enough.

My comment re the diode was only in case it was an undesignated zener diode and not that it was one and that you may have been misled into thinking that it was bad.

If there is a repair "kit" available to me this indicates a known problem with the board so you may as well try it and check if it resolves the problem

jayeff さんによる2021年1月20日

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From what I understood from comments on another site was that Diode should only let current travel one way, and if tested and the Diode is blown then I need to buy the repair kit suggested. It contains 3 power resistors, that Diode and one other component (I forget the name). — Ryan Marcotte
http://www.coppelltvrepair.com/p/639/lg-...

The difference is that I don't hear relays clicking and the screen doesn't turn on at all. No red light either. I do have 120V going to the power supply board, but no output Voltage. — Ryan Marcotte
@ryanmarcotte

Fair enough.

My comment re the diode was only in case it was an undesignated zener diode and not that it was one and that you may have been misled into thinking that it was bad.

If there is a repair "kit" available to me this indicates a known problem with the board so you may as well try it and check if it resolves the problem — jayeff

LG flat screen 37LG10-UM

TV will not turn on, no stanby light, no relays clicking.

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