Hi everyone,
I need some help repairing this power supply. I've been testing it and my conclusion is that it's sorted. Now I don't know how to find the faulty component. Can someone give me a hand?
The model number of the board is:
GL72
APDP-225A1 A
1-474-685-11
This is all the information I've gathered:
The TV does not turn on. When I push the on button a click is heard (the relay) and the red led shows the 2 blinks code (faulty power supply).
I've removed the power supply and these are the tests I've already done:
- when plugged in to mains, stand by voltage is ok.
- when I turn it on, by shorting the stand by and power on pins, REG12V are ok, but there's no voltage at TCON_VCC12V pins. Also, the voltage to the LED arrays is 97V, lower than the 163V expected as per board labels.
- with the board unplugged I've found continuity to ground in places that I believe are not supposed to have it: both ends of D950A; REG12V, TCON_VCC12V and BL_Error pins at CN6401.
- I've desoldered some components,and all have tested ok: Q123, D950A, C950A, C120B&C and C958.
My assumption here is that one or more components are faulty and shorting to ground. Am I right? Maybe one of the small ones on the bottom side of the board? How can I find the culprit?
I haven't been able to find the schematics of the board or a repair kit. I'm attaching hi-res pics of the board downloaded from shopJimmy. I'll try to take others myself if I manage to get the right light to get good pictures.
Many thanks in advance.
I need some help repairing this power supply. I've been testing it and my conclusion is that it's sorted. Now I don't know how to find the faulty component. Can someone give me a hand?
The model number of the board is:
GL72
APDP-225A1 A
1-474-685-11
This is all the information I've gathered:
The TV does not turn on. When I push the on button a click is heard (the relay) and the red led shows the 2 blinks code (faulty power supply).
I've removed the power supply and these are the tests I've already done:
- when plugged in to mains, stand by voltage is ok.
- when I turn it on, by shorting the stand by and power on pins, REG12V are ok, but there's no voltage at TCON_VCC12V pins. Also, the voltage to the LED arrays is 97V, lower than the 163V expected as per board labels.
- with the board unplugged I've found continuity to ground in places that I believe are not supposed to have it: both ends of D950A; REG12V, TCON_VCC12V and BL_Error pins at CN6401.
- I've desoldered some components,and all have tested ok: Q123, D950A, C950A, C120B&C and C958.
My assumption here is that one or more components are faulty and shorting to ground. Am I right? Maybe one of the small ones on the bottom side of the board? How can I find the culprit?
I haven't been able to find the schematics of the board or a repair kit. I'm attaching hi-res pics of the board downloaded from shopJimmy. I'll try to take others myself if I manage to get the right light to get good pictures.
Many thanks in advance.
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