I'm strugling today with trying to fix a UE40D5000 power board.
A5V gives a nice 5V, B5V and B13V stay off until I short A5V to PS-ON, so far so good.
B5V comes up as a nice 5V as well but B13V gets me 9.4V max.
Also backlight doesn't get power, those pins stay at 0 even if I put 5V on BLU_ON (measuring across CH1+ and CH1- on CNL802).
After turning on PS-ON, I see about 165VAC going into TM801S; I'm not sure what voltage I should see there.
The caps next to CNL802 get 96VDC, which seems too low as well since CNL802 should be 268V. These caps are all in parallel.
I'm suspecting the input voltage to TM801S is too low, but I can't find what I should measure on the in- and outputs of this transformer.
Suggestions welcome, thanks a lot in advance!
Attached the circuit diagram for this specific board.
A5V gives a nice 5V, B5V and B13V stay off until I short A5V to PS-ON, so far so good.
B5V comes up as a nice 5V as well but B13V gets me 9.4V max.
Also backlight doesn't get power, those pins stay at 0 even if I put 5V on BLU_ON (measuring across CH1+ and CH1- on CNL802).
After turning on PS-ON, I see about 165VAC going into TM801S; I'm not sure what voltage I should see there.
The caps next to CNL802 get 96VDC, which seems too low as well since CNL802 should be 268V. These caps are all in parallel.
I'm suspecting the input voltage to TM801S is too low, but I can't find what I should measure on the in- and outputs of this transformer.
Suggestions welcome, thanks a lot in advance!
Attached the circuit diagram for this specific board.
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