TV runs, backlight on, have sound and no image (dark grey/blue/black LCD)
Disconnected right (looking from rear of TV) tcon-buffer board cable, LCD left half displays.
No shorts on right buffer board.
Started masking tcon-buffer board signals... (connection #1 in main board pic) about 20+ pins from top of connector... LCD fully displays with some anomalies.
Gradually reduced # of masking signals... eventually down to 1. Removed that... LCD works perfectly.
No obvious damage on right buffer board 3x COF to the panel like another 43" LG fixed ( link ) with similar poor design ( COF/flex rubs against the metal buffer board guard )
Masked the metal buffer board guard with electrical tape ( orange color in pic ) Will observe for a few days. My best guess is some micro short was occurring from COF to the metal guard.

Disconnected right (looking from rear of TV) tcon-buffer board cable, LCD left half displays.
No shorts on right buffer board.
Started masking tcon-buffer board signals... (connection #1 in main board pic) about 20+ pins from top of connector... LCD fully displays with some anomalies.
Gradually reduced # of masking signals... eventually down to 1. Removed that... LCD works perfectly.
No obvious damage on right buffer board 3x COF to the panel like another 43" LG fixed ( link ) with similar poor design ( COF/flex rubs against the metal buffer board guard )
Masked the metal buffer board guard with electrical tape ( orange color in pic ) Will observe for a few days. My best guess is some micro short was occurring from COF to the metal guard.
Comment