Re: AOC TV LE22H138 Power cycle when trying to turn it on
It gets louder, when I plug the main board, but it still there, and I don't mean the usual coil wine that stuff usually does. And when it was OK it didn't squeal anyway.
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Re: AOC TV LE22H138 Power cycle when trying to turn it on
I will replace C928, but the main filter caps c904 and c905 just after the rectifier are holding charge for quite a while, after plugging the mains, so they are not completely dead, although they can be out of spec, I don't think I would blame then just yet. Or do you think they can still be the cause? Or ripple on the primary is that critical? I'm just speculating here, I don't really know
I thought about the main board, but the PSU is squealing by itself with nothing connected on it, so definitely theres something...Last edited by vitim; 10-03-2017, 10:07 PM.
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Re: AOC TV LE22H138 Power cycle when trying to turn it on
Removing the backlight connector makes no difference. (still squeaking, tv doesn't start either)
Removing the main board makes it quieter, but it stills audible....Last edited by vitim; 10-03-2017, 10:19 PM.
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Re: AOC TV LE22H138 Power cycle when trying to turn it on
I will get a meter, and report the voltages back.
Until then, I recorded a video about the high pitched noise I mentioned.
[url]https://youtu.be/if9sb0EM0zI[/url]Re: AOC TV LE22H138 Power cycle when...sb0EM0zI[/url]Last edited by vitim; 10-03-2017, 09:49 PM.
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AOC TV LE22H138 Power cycle when trying to turn it on
I have a 21" AOC TV that is not turning on, the standby led (orange) is ON but when trying to turn it on, the led goes on blue for a second and it shuts off and goes back to stand by (orange).
There's a whine noise coming from the transformer.
I couldn't notice anything obvious in the visual inspection, while I know it is probably something wrong with the power supply, I don't know where to start.
I don't have schematics, but the circuit is fairly simple as it is a single sided board. I included the best pictures I could take of the top and bottom,...
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Re: New Members - please post your introductions here
Hello, I'm Vitim, a software developer, joined this forum because it was mentioned by a fellow member on the eevblog forum.
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