LG 32LD350-UB no picture

[icematt]

Service Code: 32LD350-UB.CUSWLHO

I got this TV for free after it had died during an electrical storm. I don't have all the details but lots of people in the neighborhood had their TVs and other electronics die at the same time. When I first got it it would not turn on at all. I tried replacing the power board which made no difference. I then replaced the main board and the TV came to life, albeit without any video on the screen. The audio works fine, backlight comes on, buttons work, but there is nothing on the screen, not even menus. I assumed the culprit was the T-CON board since it behaved exactly the same with it unplugged, but replacing the T-CON board made no difference. I have tried reseating all the relevant cables to no avail. I have checked the cables for continuity and not found anything wrong. I have checked D1, D2, and US2 on the T-CON board and they all show voltage (I forget the exact readings, two of them were 3.3 I believe). Also there is one other board at the top of the screen that I cannot identify or see how to remove. Any help, advice, or diagnostic suggestions would be most appreciated.

[zacheriaj]

Re: LG 32LD350-UB no picture

It looks like access to that board is by removing the front bezel (plastic piece). Look at the two metal tabs on that top section and see if they are able to release it.

[budm]

Re: LG 32LD350-UB no picture

Did the LED2 on the T-CON board even flash on? What DC Voltage do you have on F1 fuse?
That big long PC board is where the tab from the LCD panel flex PCBs are tab bonded to.
What Voltage do you get at the test point VCC2 (2Volt) by the US2 regulator IC, test point VDD, VGH, VCC?

[icematt]

Re: LG 32LD350-UB no picture

VCC2 1.85V
VCC 3.3V
VGH 2.5mV
VDD .5mV
F1 9.5V

It's early and I didn't get much sleep so I'll double check the values later. As for the LED2, no I haven't seen it come on, but it's placement is very curious. There's a hole in the PCB through which the LED peeks out the other side, and there's also a hole in the metal backplate directly behind the LED which lets the backlight shine through the LED, making the LED appear lit up.