LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

[DXseekerMO]

A few weeks back I got a call from a guy who said lightning had struck close to his apartment building, and ever since the TV would not come on. He said a total of four electronics items close to the TV were lost at the same time. He just wanted to get rid of it, and I'm always game for that!

So finally today I had a chance to check it out. When it's plugged in to the wall there is no stand-by light. When the power button on the TV or remote are pressed the S/B light flashes three times and the Optical Audio light comes on.

Shining a flashlight upon the screen reveals no image on start-up or when the TV is on. Press the power button again, the Optical Audio light goes out but the S/B light does not come on.

Here's the pinouts and corresponding voltages found:

Pin name……………….v TV off……………………..TV on

MS…………………………. 0v ………………………. 0v
GND
13.2v……………………. 7.7-7.9 unstable ………13.2v
13.2v……………………. 7.7-7.9 unstable ………13.19v
GND
PWR_ON............... 0v …………………….…. 3.37v
PDIM1…………………… 1.84-1.87 unstable … 3.28v
GND
13.2v……………………. 7.81-7.96 unstable … 13.2v
13.2v……………………. 7.81-7.96 unstable … 13.19v
13.2v……………………. 7.81-7.96 unstable … 13.19v
PDIM2………………….. 1.84-1.87 unstable … 3.28v

LED+………………………………………………………… 326
LED-…………………………………………………………. 162
LED+………………………………………………………… 326
LED-……………………………………………………….… 162

I tested both backlight strings with the tester and they do illuminate. I also tested the T-CON fuse, it is good with voltage present on both sides. Furthermore there appears to be signal voltage at the T-CON LVDS side test points as well as output voltages present at the T-CON FFC side.

Detaching either FFC from the T-CON to the Source driver boards results in a white screen on the corresponding side of the screen.

Powering up the backlights with the tester while the TV is on and there is no picture upon the screen.

So can anyone help me with troubleshooting this further? I'd appreciate it!

Pictures posted!

[nomoresonys]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

What do you have on the big cap C611when powered on?

[DXseekerMO]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

What do you have on the big cap C611when powered on?

I've got 395v

[budm]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

Looks to be the main board issue, more likely the surge went through the HDMI port.

[DXseekerMO]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

Looks to be the main board issue, more likely the surge went through the HDMI port.

Would this affect backlight operation? Also, what is the MS pin on the Power Supply and its function?

As far as I can tell the PS is working ok so yes very likely HDMI entry point for the surge

[R_J]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

What is the number on IC801, that would help to determine the function.
The pin looks more like M5 than MS

[DXseekerMO]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

What is the number on IC801, that would help to determine the function.
The pin looks more like M5 than MS

I'd love to tell you the number off IC801, unfortunately its covered with a thin shellac and obscured. Any suggestions on how to remove that coating?

I have urethane grade reducer for auto body repair....but it eats plastic quick.

[R_J]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

Just try some alcohol, that usually works, you may also need to look at an angle to read the number.

[nomoresonys]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

So if you're getting a white screen then the backlights are on and you are just not getting a picture, correct?

[DXseekerMO]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

So if you're getting a white screen then the backlights are on and you are just not getting a picture, correct?

Sorry, no that isn't correct. I have no image on the screen, the screen is black and I have no backlights.

[budwich]

Re: LG 65UH6030-UA lightning strike, no S/B light, no backlights, no OSD

go to the usb connector and look for 5v. pull the shield / heat sink on the main board so you can see whats up there.