When I turn it on, the power supply starts doing this noise, and shows no image (I dont know if I have sound since I dont have any source attached).
Searching in google people say its either a faulty capacitor or a faulty pulse transformer.
VIDEO -> https://youtu.be/7_9UElozRuQ
PHOTOS -> https://imgur.com/a/UCYC01J
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Hi @maradonagolaso,
That sounds a lot like coil whine from one of the transformers, but it's almost impossible to tell via a video.
It also did sound like it was more discernible when you were close to one of the transformers.
Also; The one big electrolytic capacitors, visible here, looks like it's starting to bulge at the top which is a clear sign of decay.
A cap from 2008 is pretty old, and caps are some of the first things to go in power supplies (along with inductors).
I would continue to listen closely to try to make out exactly which components is making the whine.
Digression: A directional microphone (with digital output in decibels on a meter), can identify where the sound is the loudest, which will be on (or very close to) the component in question. But not many people have this equipment at home :/
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@maradonagolaso could be anything which causes your Transformer to make that noise. Check the power supply. Get a multimeter and measure to see if you have:
13VDC at pin 30 of CN1001
If you don't, it is your power supply that has failed.
Check C1040 for 3.3VDC, C1015 for 5V C1039 for 3.3V and C1073 for 1.2V. All voltages are DC. Any of those voltages missing would be cause by a bad main board. Remember that it si the main board that tells the power board to turn on (simplified) etc. You still want to be careful since this is a live test and you do NOT want to touch your caps etc. with your bare hands etc. Could be a shocking experience., so be careful.
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@maradonagolaso hissing essentially could be normal but since your TV does nto show any image, the issue may be something else. First we need to know the exact model for your TV. Looked like a LE32A336J1D in your video but I got dizzy checking on it :-)) Then remove the back cover and post some Good pictures of all of your boards with your QUESTION. That way we can see what you see. Do you have sound? What have you checked? Adding images to an existing question
из oldturkey03
@oldturkey03 Its baffling for me that you got almost the entire model number right with just the video, didnt took photos of the main board since I was so sure the power supply was the issue.
I will check the voltage values that you said this night/tomorrow (Im guessing I have to do that in the main board since I dont see anything close to those names in the power supply photo), thanks a lot for replying oldturkey!
из David