Re: lg 26LC2R lcd tv backlight turns off

Abandoned all this U11 stuff as overkill and just lifted pin 1 of U11 from the board, then injected 2V to pin 1 of BA10393 IC - but the problem persists. Reading the datasheet (pg. 5, point 8) tells this: "Toggling the enable signal from low to
floating will resume normal operation." What could that mean? Should I put a momentary switch to the back of the device? Or just scrap this old box?

Re: lg 26LC2R lcd tv backlight turns off

Doing some "continuity poking" around the PCB I found out the signal to pin 1 of OZ9936 comes from the IC named U11, which is a BA10393 comparator - I would have to further investigate, what occurs on pins 2 (-) and 3(+) of the comparator. (Log to self and whomever: comparator outputs full on if the positive is higher than negative and zero if negative is higher than positive) And where those pins 2 and 3 are connected. It is probably safe to say it would suffice to ground pin 2 to save this whole drama, but I must test this idea...

Re: New Members - please post your introductions here

Googling a fix for a brokend old LG TV backlight showed me this forum and I was immediately hooked.
Electronics and repairs is just a hobby for me, I don't have any formal edication in the field. This means I may be having some quite surprising "eureka moments" during my conversations - and also repairs. Been more in guitar stuff - tube amps and effects - mostly, but often I'm required to repair other stuff, so this forum is golden for me. Also, I've been always very fond of caps, seeing those bulky reservoirs...

Re: lg 26LC2R lcd tv backlight turns off

My TV has exactly the same problem - backlight gets turned off after few seconds. Measuring the voltage on pin 1 on OZ9936 i got:
- a the start - 0volts
- soon after start, the backlight turns on - 1,95volts
- after cca 2 secs - 0volts again, backlight off
Datasheet says pin 1 is the enable pin - but where does it get the enable signal from? Why does this device stop providing enable signal?
I tried injecting 1,5V in the attached pin1, but the backlight remained unstable, the device sinking enable signal to...