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TV Model UN60H6203AF blank screen but has audio

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I have done the following tests:

  1. I see no apparent damage on the boards and/or components
  2. I can see image on the screen using a flashlight
  3. Voltages on the connector (CNM803) to the MB where OK: 1,3,5&7:12.8V (Reference 13V); PS_ON:3.8; PWM_BLU:3.2; UD:2.3; GND:0

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  1. I didn’t see any voltage (that means 0) on the led power connector (CNL802) (but I want to make sure I tested it right: With TV ON, tested in DC Volt: Black tip on Chasis and the red on each pin. Tested with the connector plugged and unplugged)

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I am able to do any other tests or follow your suggestions to fix the TV.

Thanks for your help

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Hi @icanfixit4us ,

Disconnect the power from the TV and then disconnect the mainboard from the power board. Reconnect the power to the TV and then turn on the TV and check if the backlights come on.

If they do it may be that the mainboard is not "telling" the power board to turn on the power to the backlights.

If they don't come on it may be a problem in the power board.

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Hi @jayeff, I did the test and didn't see any backlights. It looks like it is the Main Board.

Did I check the Voltage correctly before?

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Hi @icanfixit4us ,

I haven't got a schematic but did you try testing for voltage where the LED backlight connector is with the mainboard disconnected like I described above?

It may be that there is a voltage there but with no LED backlights then there is a problem with the backlights.

Before when you first tested the mainboard was connected and you said that there was no voltage there which may be correct if the mainboard had a problem and was not telling the power board to turn on the power to the LEDs

But if the LEDs aren't working with the mainboard disconnected then you have to see whether there is power at the connector just to prove whether it may be a LED problem or not. Apologies i should have mentioned it before.

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1 Answer

Chosen Solution

Hi @icanfixit4us ,

Just found this which shows how to do a "forced backlight test/ SMPS-on mode" test which may help explain it better.

It uses the same power board as your model (BN44 00775A) so it should be the same

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Comments:

Thanks @jayeff I will try the tests. That's very good info.

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