1. voltages across C19=325v, C20=324v, C21=324v
2. Diodes seem ok but ...
on diode setting my multimeter (Sealey MM19) shows 1 for open line. With -ve probe on grey band side I get a voltage. With +ve probe on grey band side I get voltage and then settles down to 1 after a few seconds. If useful I can detail the results for each one (but unsure how to identify other than referring to image)?
the ic should be on the bottom of the board somewhere and diodes that read odd i just un solder one side lift it up from the board and retest. Im still learning myself so im hoping a more experienced member will give us some assistance to but for now do your best and follow this thread and run the tests suggested by the others.
i hope so too the trouble is when we zoom into your pictures we cant see the part numbers etc on the ic s etc so it makes it hard to see what particular ic s etc are fitted on your psu can you try re uploading them maybe try this , click on go advanced then theirs a paper clip icon click on that and add your pictures that way.
the information of the ic is very small so it may be a problem but the one above has 6300A MYC on it (I can only just make it out). but still haven't found the problem so how do I test this (do I need it plugged in?)
Thanks dick-barton you have more experience than i have in repairs, i did advise to replace that ic and added a link, but he could not find it on his board? hence i asked for better pictures so we could point out the ic.
how do I test this? (also what does an led mosfet look like?)
led mosfet i think maybe q17? bottom side of board hopefully dick-barton will advise although i think your issue maybe that fan6300 ic i sent the ebay link for
Last edited by vinceroger69; 11-02-2017, 08:08 AM.
on the board you have printing by each component q15 is the a reference designator, we think its the led driver mosfet you have been asking about earlier in the thread q basically means transistor like c then a number means its a capacitor r then a number is a resistor this link is quite good. https://electronics.stackexchange.co...-markings-mean
q17 yes thats the one i thought may of been the led driver mosfet but dick-barton mentioned it maybe q15 which is on the top side of the pcb under a black heat sink i think
this guide may help you https://www.youtube.com/watch?v=RkWy1EirEu8
Hi guys, thanks a lot for all the descriptions, it already helped a lot to understand the process and common falts. I have the same vestel board in a 'Telefunken' TV. The standby LED on the front is blinking. I tried all measuring than you described. On the CN4 output connector I read the 12 volt but I don't get the 5v standby voltage, any guesses what could be wrong? I also read 2.5v on pin7(the 4th pin in the upper row, starting from the pin that is marked as 1 on the board). I could't find a shorted diode, I still changed d22, d24 and d26 but that was more like last resort . The mosfet is a FDD120AN15A0, I tried to measure the DC voltage to ground it was 34v between source and drain and 34v between gate and drain, not sure how to interpret that. Hopefully you guys have a hint, best joba
Hi, i have Finlux TV with this same powersuplly, measured between q17 drain and source and its shorted? Also when this is plugged in i hear very high pitched noise going louder about 2 secs and then silence for 3-4 sec and again, as itś trying to start or something.. this comes from the powerboard..?
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