Lg 32LB75

[nezocas]

Hello,

Tv not starting correctelly... goes out of standby with green led and back to standby.
PSU: EAY38639701
All caps in PSU were ESR and capacitance tested, inclunding the problematic ones on the mainboard C227/543/958/853/959/970.
PFC is 395Vdc
If I bypass the ERROR pin in the plug 201 and connect it with a 100homs resistor to the 5v rail, Tv work´s with sound but no backligth present.
All voltages on p201 present with the bypass.
Not sure what to do...???

Regards
Nezocas

[Garion60]

Re: Lg 32LB75

Can you provide more symptom details, please?

[neilc6]

Re: Lg 32LB75

If TV has no backlight or flash of backlights, backlights are the first suspect. Especially LG LA, LN, LB or LF series.

[nezocas]

Re: Lg 32LB75

Hello again,

All 14 CCFL tubes were tested individually with my tester.
On the Q707 there is only 18v, it should be 24v from what I have read online.
But I have no schematic from this PSU.

I have followed this topic, but the fault is not the same, I dont even get a blink from the tubes:
https://www.badcaps.net/forum/showthread.php?t=37829

[neilc6]

Re: Lg 32LB75

Sorry thought TV was LED. Not familiar with European model numbers. Odd LG reusing the numbers. CCFL TVs are pretty old and obsolete and 32 in one can be usually found for free. Maybe someone more experienced with CCFLs can help you. You can check for shorted FETS on the inverter board and also measure the secondary transformer impedances to see if they match.

[nezocas]

Re: Lg 32LB75

Hi,
Tv was scraped, to many hours to fix old tv.
Thanks
Regards