LG 29LB4510 - Backlight on no display

[caphair]

Powers on/off fine. Backlight visible but nothing on the screen, just black display.

Made following checks on t-con

V33v12 = 3.3v
Vgl = -7.8v
Vgh = 27v
Rx5 = 3.3v
Rx4 = 3.3v
Rx3 (1k ohm) = 0v
Rx2 = 3.3v
Rx1 = 3.3v

Not sure what else to check for at this point

[caphair]

Re: LG 29LB4510 - Backlight on no display

Anyone?

[R_J]

Re: LG 29LB4510 - Backlight on no display

This is when a scope is useful, without it you are guessing, is it the main board not outputting a video signal? or is it that t-con not processing the signal?

[caphair]

Re: LG 29LB4510 - Backlight on no display

Unfortunately don’t have a scope. Maybe I could borrow one. Where would I be probing with it?