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Old 02-06-2019, 02:58 PM   #1545
kevin!
recapping PCB.
 
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Join Date: Jul 2013
City & State: Gerona
My Country: Espaņa
Line Voltage: 230VAC 49Hz, 2 Ph
I'm a: Hobbyist Tech
Posts: 135
Default Re: the gutless, bloated, and fried power supply hall of shame

This PSU comes from a satellite decoder, from one day to the next, the decoder stopped turning on, and the PSU was chirping, I opened it and found this:

Primary:
IC switch: DK120 (max output 12v, 1A)
photocoupler: 817c
Main capacitor: 400v 10 microfarads YZJ (LED series) (the IC manufacturer recommends 22 microfarads)
VCC capacitor (supplies VCC the IC DK120): KSJ 16V 100 microfarads
1 capacitor Y
Transformer 12v 1A TA rev. A
Secondary Output:
1 schottky diode sr3100
1 capacitor KSJ 16v 470 microfarads (bad)
1 inductor 10UH
1 capacitor 16v 220 microfarads (requires a 470 microfarad capacitor)

In the end I replaced the PSU with a better one.
It lacks a zener diode (there is no voltage stabilizer), capacitors of smaller capacity than DK recommends for good operation.
Terrible PSU.
The only thing that is good is the PFC winding.
Attached Images
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Last edited by kevin!; 02-06-2019 at 03:08 PM..
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