Hello Again, I'm back with a small power supply that failed after a whopping 1500 hours of service (impressive, eh?). Now this repair isn't urgent as i do have a few extra units on hand, so i'm mostly doing this to work on my skills. Anyway, i've done a bit of probing around on the PCB, testing components, and have found nothing that seems to be out of the ordinary, but here are the components i've probed.
D2 (F7)
R5 (3.3Ω)
R6 (100K)
R4 (1.2Ω)
R11 (2K)
R18 (10K)
R19 (22Ω)
FS1
RT1
C1 (Aishi HS 15uf 400V)
C3 (Aishi WH 22uf 35V)
I've also probed the bootstrap winding of the transformer and compared that to a working unit, and they both matched. So i'm inclined to believe that there's something wrong with the driver IC. The part number on the IC appears to be 63L20, but after a lot of searching, i could not find anything about the IC.
So now what do i do? Did i miss anything? Any help will be appreciated.
D2 (F7)
R5 (3.3Ω)
R6 (100K)
R4 (1.2Ω)
R11 (2K)
R18 (10K)
R19 (22Ω)
FS1
RT1
C1 (Aishi HS 15uf 400V)
C3 (Aishi WH 22uf 35V)
I've also probed the bootstrap winding of the transformer and compared that to a working unit, and they both matched. So i'm inclined to believe that there's something wrong with the driver IC. The part number on the IC appears to be 63L20, but after a lot of searching, i could not find anything about the IC.
So now what do i do? Did i miss anything? Any help will be appreciated.
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