Lg 55ld520c

[Ltank]

Hi Guys,
The set has no video. No OSD. The Main Board and Tcon are on one board.
All the P.S. voltages are good. You can see that the EEFL are good. There was place to test the Tcon section on the set due to the Mainboard and Tcon are combined into one board. All the suppliers dont have any used or refurbished. Only Endcompass has new boards for 170 bucks. The Original board # EBU010888T 61044602 End compass shows a EBR71385101 for this set. I downloaded a service manual and it breifly talks about updating firmware but set has no USB or RJ45 connection. Even if it did wouldn"t I need video on screen to make it work? It does have a RS232 port for control and service. How do I update firmware on this set before ordering a new Mainboard?
Thanks.
Ltank

[capkid]

Re: Lg 55ld520c

I don't see that there is any firmware available for this TV on LG's site. I was thinking the RS232 might be your only option if firmware updates are allowed or available.

Here's a board with a 60-day money back policy: http://www.ebay.com/itm/LG-55LD520C-...item3cd3cc2782

Shorter return policy: http://www.ebay.com/itm/LG-55LD520C-...item3f273ee329

[Ltank]

Re: Lg 55ld520c

I saw another model that had the main board and control board combined that a jumper was attached to test the tcon section of the board but I failed to determine where to make the jump. Where would I make the jumper? . All voltages were reasonably close and there was back lighting. Am I wasting my time to check this and just order the main board? I could not find a complete schematic on the Main board, only partials in the service manual.
It would be comforting to see a test pattern so I can see that the screen / panel is good prior to spending money on board. I would hate to spend my money then to find out that the panel is bad, then i wasted my money and the customer will not pay.
Thanks,
Ltank

[Ltank]

Re: Lg 55ld520c

There is a Micom reset button SW1001 on Main Board schematic shows it resets IC 1002 F0513A (48 pin). No change. Set has no menu, backlight comes on. Put HDMI source to port, cycled through inputs never got video or audio. All PS voltages are good. Menue should work even if the HDMI ports were bad. Power surge was suspected cause. LG made several different main board for this model. MB is EBU61044602. I tried another board but for a different part # but for same 55LD520C. I checked the LDOs voltages were fine.
If they used different main boards did they use different screens that require a certain board for same model? Hints?
Once power button is pressed it takes about 10 seconds for backlight to turn on. On audio is heard when turning on