Beginner repairing modern TVs

[rthorntn]

Hi,

I have an 8yo LG 55EA9800 55" OLED, purchased at launch RRP, so I spent a small fortune on it, the picture was still great, but the display went black at the weekend, its turning "on" (I can hear the "click") but I can't see or hear anything so I guess a board is dead, can anyone point a beginner in the right direction?

Has anyone repaired here repaired a modern set like this, from googling around I can see that there is a "T-Con" board as well as a Main B/D, the service manual (for a blank screen with no sound) says "Check various voltages of Power Board (3.5V, 12V, 20V & 24V)" and if its not the PSU then replace the Main B/D.  Update: I took the back off the TV and measured 3.5V, 12V & 24V OK.

I mean I would easily pay up to $500 to get it working again, it was a great TV, its quite a delicate thing though and a bit daunting to have to move it around alone, I have a DMM, I guess I can get into the back of it to check them voltages.

Thanks.
Richard

[strawberry]

worn, 8Y is much, processors run at max temperature they can handle 
If it runs in protect mode, in diode mode test supply rails for shorts, Tcon, CPU...
abnormally hot chip may lead to right direction

[Terry Bites]

Here's the service manual- check all your rails. https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=&ved=2ahUKEwiHmenDq9L3AhUGacAKHR_WCcIQFnoECAQQAQ&url=http%3A%2F%2Fwww.lcd-television-repair.com%2Fnewsletter%2F3-11-2015%2FLG-55EA9800.pdf&usg=AOvVaw2j8xfWO4RwQnf_9yBixXB8