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Old 10-18-2020, 02:29 PM   #1
rigeback
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Default AOC led monitor

Hey Guys, I have problem with a power supply board which I think is not starting up since there is no 5V.

The board has a PWM Controller LD7576AGR (IC901) and might be bad according another post although there is 105V on the photocoupler pins.

I changed the caps in the high voltage zone hoping for a quick fix but this is more complicated and not sure where go from her.

Any thoughts appreciated.
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File Type: jpg 20200927_124531.jpg (677.3 KB, 11 views)
File Type: jpg 20200927_124550.jpg (881.3 KB, 7 views)
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File Type: pdf aoc_e950swda_lcd_monitor_service_manual.pdf (3.22 MB, 17 views)

Last edited by rigeback; 10-18-2020 at 02:34 PM.. Reason: attachments
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Old 10-18-2020, 05:52 PM   #2
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Default Re: AOC led monitor

What voltage do you have ACROSS the main filter, C907? check R924, it should read 0.47Ω.
What photocoupler are you talking about? U902? if that is it, what ground were you using? hot ground or cold ground.
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Old 10-19-2020, 04:06 AM   #3
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Default Re: AOC led monitor

Yep I thought it was strange when I tested the big cap again and found I had 0 Volts, thought my multimeter was messed up.

After seeing I wasn't getting 220V on board I tested the cable and low and behold the fuse was blown, not sure when or how this happened maybe before I changed the caps!

To sum it up I replaced the fuse and every thing works. monitor is up and running.

Thanks for refreshing my memory.

Cheers
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Old 12-19-2020, 02:46 PM   #4
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Default Re: AOC led monitor

New problem with this monitor regarding the panel.

It has developed a flickering to lines on the R/H side, I have tried adjusting it with display properties which helped a bit but I can see that it could be the panel at fault.

I am considering the ribbon shim trick although it will be a complete tear down of the panel.

Any thoughts suggestions??
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Old 03-12-2021, 07:59 AM   #5
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Default Re: AOC led monitor

Tried the ribbon shim trick but the problem does not seem to be with connectors and I'm thinking there could be some thing wrong with the T-Con?

anyone had this issue before/

Much appreciated any thoughts
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Old 03-12-2021, 09:05 AM   #6
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Default Re: AOC led monitor

Full model number?
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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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Old 03-12-2021, 02:17 PM   #7
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Default Re: AOC led monitor

Hi there,
Its the led AOC 19" e950SWda the service manual is attached with the first post.
Most of the panel is good al; though with a quarter missing its a bummer
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