Okay working on this for a Corpsman and his wife. Here were the symptoms:
Plug it in, wait for a bit and would hear about five clicks from the PS. Front LED would start to blink....2 times, short pause, 2 times, short pause, 2 times, short pause, 2 times, short pause, 2 times, long pause repeat....
Was unable to locate a LED error code diagram so we opened it up.
With everything plugged in Vs was 0V. Did have 5V at STNDBY and 3.25V at PWRON.
Decided to go for a resistance reading, vice voltage reading for the Vs. With everything connected, Vs was shorted to ground.
Unplugged the X main and Vs read an open with black on ground and 474 ohms with red on ground.
Unplugged the Y main and Vs read an open with black on ground and 847 ohms with red on ground.
Did some checks on each of the cards: Vs on the connector pins to ground,
X main showed a short, Y main shows a open, PS shows a open.
On the X main: SVC_VS is shorted to SVC_GND. Believe all but three of the power transistors are shorted (quick check).
I'm about 90% sure the X main is the problem, several transistors read low resistance from one leg to another.
The problem I have is finding or being sure of what board would work in this TV.
The board number, as I understand it, is LJ92-01763A, with a revision of AA4. The barcode has the 763A and AA4 on it. It also has large stamped letters on the top of the heatsink of "DFG", not sure if this has any meaning or not. The other thing I have noticed, different from other boards I have looked at, this board has four large red capacitors in a row (other boards have three).
Of course the three capacitor boards are readily available and cheaper, the four capacitor boards are expensive and hard to find. Yet, they are all advertised as the same board.
Any assistance would be appreciated.
Plug it in, wait for a bit and would hear about five clicks from the PS. Front LED would start to blink....2 times, short pause, 2 times, short pause, 2 times, short pause, 2 times, short pause, 2 times, long pause repeat....
Was unable to locate a LED error code diagram so we opened it up.
With everything plugged in Vs was 0V. Did have 5V at STNDBY and 3.25V at PWRON.
Decided to go for a resistance reading, vice voltage reading for the Vs. With everything connected, Vs was shorted to ground.
Unplugged the X main and Vs read an open with black on ground and 474 ohms with red on ground.
Unplugged the Y main and Vs read an open with black on ground and 847 ohms with red on ground.
Did some checks on each of the cards: Vs on the connector pins to ground,
X main showed a short, Y main shows a open, PS shows a open.
On the X main: SVC_VS is shorted to SVC_GND. Believe all but three of the power transistors are shorted (quick check).
I'm about 90% sure the X main is the problem, several transistors read low resistance from one leg to another.
The problem I have is finding or being sure of what board would work in this TV.
The board number, as I understand it, is LJ92-01763A, with a revision of AA4. The barcode has the 763A and AA4 on it. It also has large stamped letters on the top of the heatsink of "DFG", not sure if this has any meaning or not. The other thing I have noticed, different from other boards I have looked at, this board has four large red capacitors in a row (other boards have three).
Of course the three capacitor boards are readily available and cheaper, the four capacitor boards are expensive and hard to find. Yet, they are all advertised as the same board.
Any assistance would be appreciated.
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