I have a lg tv here that is one of those commercial tv units. It will power on make a staticky sound then shut off. It does display a picture then it just shuts off what can I do? The psu has good standby voltage as well. I'm wondering if the lamp is dead possibly?
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LG 37LC50C Turns on then off
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Re: LG 37LC50C Turns on then off
I think the motherboard has a issue because when I was probing the psu connector accidentally shorted ps_on with 5v standby and it kicked on no issue. I imagine some bga/capacitor issue on mainboard. I'm buying a new motherboard and will report back.Last edited by Super360; 12-28-2021, 03:09 AM.
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Re: LG 37LC50C Turns on then off
18V=18V WHEN POWER IS PRESSED ON. 7v when power is off
18v=18V WHEN POWER IS PRESSED ON. 7v when power is off
6v= 6when power is on 0.700v when power is off
3.4v= 3.5v when power is on 0.700v when power is off
12v= 1.300v when power is off 12 volts when power is on
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Re: LG 37LC50C Turns on then off
The voltages are fine except for the 5V pin. You must have noticed that too, Now I do not know if it's actually used by the TV, since there's 6V going to the mainboard, trace to find its source on the PSU board.
If the backlight stays on during the ps-on test it's not the inverter, the signals (bri, i-c, dim) that the mainboard is sending are normal.
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Re: LG 37LC50C Turns on then off
I bought a repair kit for this psu. https://www.ebay.com/itm/tkit28-LG-3...-127635-2958-0
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Re: LG 37LC50C Turns on then off
Originally posted by Super360 View PostI bought a repair kit for this psu. https://www.ebay.com/itm/tkit28-LG-3...-127635-2958-0
SLOW START UP
STUCK IN STAND BY
C204
C205
C221
C222
C223
C232Last edited by vinceroger69; 01-01-2022, 08:41 AM.
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Re: LG 37LC50C Turns on then off
Originally posted by Super360 View PostWell seeing as how you made it easy I opted to just buy the caps outright instead much cheaper.
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Re: LG 37LC50C Turns on then off
LOL I was like how did this mf find all these capacitor values. I was searching through the listing trying to find what you saw lol thank you man. Will give ya guys a update when these low-esr ebay special arrive.Last edited by Super360; 01-01-2022, 01:06 PM.
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Re: LG 37LC50C Turns on then off
does the backlight flash on and off i wonder if this is a 2 second too black fault as ccfl set
ignore the above, i see you can trick the backlight to stay on so not that.Last edited by vinceroger69; 01-17-2022, 04:09 AM.
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Re: LG 37LC50C Turns on then off
One of the first and least expensive things you can do when you have an issue is take the powerboard out of the tv, flip it over and look the solder joints over with a magnifying glass if needed, add a little flux to make the solder flow well and add solder to any joints that look even a little suspect. You can practice on a scrap pcb board if needed, careful not to bridge any joints, and always let the board sit for quite a while or discharge the big caps with an appropriate resister before working on it (safety first) to try to keep from getting shocked, it doesn't take 1000 volts to KILL, a lot less can kill, so be careful, it's only a tv.
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