I've seen a couple posts related, but none that solve my situation. Model No LG 75UK6570AUA.BUSGLOR Serial: 902RMRH6E566 Symptoms - turns on, hear startup chime, backlights turn on, no picture or menu. Confirmed sound works with input device but no pic and again, the backlights are on. - Replaced T-Conn board, NO change in symptoms - Replaced Main board - after doing this, no longer have sound, no startup chime, and cannot produce any sound using input device. Backlight still works and still no pic. - Replaced power board - no change in symptoms. This probably was not the best course of action, but I was frustrated and thought I would make sure. How likely is it that the new replacement main board I ordered from shop jimmy is bad? Any advise what to try next?
Shop Jimmy is one of the better suppliers, but this explains the problems you are facing.
https://www.fixya.com/support/r29790007-repairing_own_television
We do have one television expert on Fixya now. If Larry doesn't turn up, email him at [email protected].
Shopjimmy tests their boards but a main can be damaged if it's not handled properly, it's very sensitive to static damage. Remove the flat strips going from the tcon to the panel boards, clean them and look closely to be sure there isn't any bent or broken contacts, do the same with the LVDS cable going from main to tcon. Next thing to do is check the fuse on the tcon board, if it's blown don't order a new board but throw the set out as the panel is defective. If the fuse is ok I'd send the main back and get another one from shopjimmy as it sounds like this board is bad.
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