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 inclined (built computers, engines, and the like) so I opened up the back panel and started probing with a DVM.
With the TV on, here is what I found:
AC Plug to PSB (EL1) (brown wire): 1.3V - 3V continuous fluctuation.
AC Plug to PSB (EL2) (blue wire): 1.3V - 3V continuous fluctuation.
C613 +: 320V (This was measured by using the positive lead and a common ground. I didn't see the suggestion on this site to measure the voltage by using both capacitor leads until later.)
The following results are with the inverter boards unplugged and plugged in (no differences):
P201: all voltages/grounds matched the printed value. I wasn't sure what value was normal for the non-numerical, non-ground labels.
P202/P203: all voltages/grounds checked out.
So my question is this: what else am I to look for? Any fuses on the inverter boards? I saw two fuses on the power supply board (both showed continuity), are there anymore?
I'm attaching a few pictures of the power supply board and components. There is a suspect area on one of the heat sinks with the black things screwed to them (not sure what they're called). I can't tell if it is heat damage or just assembly dirt.
(I tried uploading the pictures via this site's attachment function but couldn't get past the "Uploading Files - Please Wait" message. So I'm using Photobucket instead.)
P201
P201
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 inclined (built computers, engines, and the like) so I opened up the back panel and started probing with a DVM.
With the TV on, here is what I found:
AC Plug to PSB (EL1) (brown wire): 1.3V - 3V continuous fluctuation.
AC Plug to PSB (EL2) (blue wire): 1.3V - 3V continuous fluctuation.
C613 +: 320V (This was measured by using the positive lead and a common ground. I didn't see the suggestion on this site to measure the voltage by using both capacitor leads until later.)
The following results are with the inverter boards unplugged and plugged in (no differences):
P201: all voltages/grounds matched the printed value. I wasn't sure what value was normal for the non-numerical, non-ground labels.
P202/P203: all voltages/grounds checked out.
So my question is this: what else am I to look for? Any fuses on the inverter boards? I saw two fuses on the power supply board (both showed continuity), are there anymore?
I'm attaching a few pictures of the power supply board and components. There is a suspect area on one of the heat sinks with the black things screwed to them (not sure what they're called). I can't tell if it is heat damage or just assembly dirt.
(I tried uploading the pictures via this site's attachment function but couldn't get past the "Uploading Files - Please Wait" message. So I'm using Photobucket instead.)
P201
P201
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