Re: LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
A new main board from shopjimmy.com solved the problem! Thank you budm!
Thank you to the guys at HEGE supporting Badcaps [ HEGE ] [ HEGE DEX Chart ]
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Re: LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
Thank you for your response.
While I am comfortable checking for voltages and such, I don't think I'm quite on the level of replacing individual parts like capacitors, resistors, transistors, etc. I'd rather purchase a new main board than try my luck at resoldering components. (I was never very good at soldering.)
The way I see it, there are several boards that I'd be ok replacing. The power supply board, the main board, the four inverter boards, and the T-CON board. If you think,...
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Re: LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
I disconnected the T CON board and measured the INV ON voltage again and still get 0.0V.
I couldn't discern any noticebly hot IC's on the main board.
What would cause the main board to not send the signal to turn on the inverters? Or is it not that simple to diagnose yet?
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Re: LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
Ok here are the readings with everything plugged in and the tv on with solid blue LED indicator light:
P201 (goes from the main board, with all the in/outputs, to the power supply board):
ERR: 0.0V
P-DIM #1: 0.1V
A-DIM: 2.4V
INV-ON: 0.0V
~
PWR: 24.3V
P202 (goes from the power supply board to the inverter board on the right (left if looking at the tv from the front)) :
INV-ON: 0.0V
ADIM: 2.9V
P204 (goes from the...Last edited by TheAssassin; 07-17-2015, 08:15 PM.
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Re: LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
Thank you for the quick reply.
All the pin names are visible. The last two pictures in the first post are the same socket, just different sides. The other ones don't have any labels on the side that's blocked by the wires. Sorry if that wasn't clear. I labeled the last two pictures as P201 just now.
I will get readings for these now....
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LG 55LD520 - No Backlights, No Image, No Sound (Lot's of Pictures!)
Good evening (or morning) everyone,
I have an LG 55LD520 that I purchased two years ago and is out of warranty. A few days ago, lightning struck very close to my house. Despite being hooked up to a surge protector, the TV no longer works.
When I turn on the TV, the red LED indicator at the bottom flashes a few times and then goes to solid blue. However, the backlight does not turn on and there is no image (obviously). The flashlight trick yields nothing. Given that I cannot determine which input I am on, I cannot verify if I have sound.
I am fairly technologically...Last edited by TheAssassin; 07-17-2015, 07:49 PM.
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Hello everyone. I am an avid DIYer. I have many hobbies ranging from building computers to building race engines. My passion is finance and aerospace.
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