Re: LiteOn PA-6601-1A (600w) blows its TOP
I had the problem with R302, F1, C301, C302, Q301, Q352 and D355. In a first attempt to fix the supply, I replaced these components. However, the fuse blew again and MOSFETs, transistor and diode failed again.
After some iterations, I discovered that also Q305 was broken (replaced with CSD18532).
In my latest attempt, I also replaced a bunch of other components: U351 & U352 (MIC4424 or UCC27524), the 5 optocouplers, the TOP249, Q302, C303, U401 & U501 (SN74HC02). For Q301, I found SIHP24N65 as a replacement.
However, the problem is still not solved. I get 25V in standby, but on power up, the fuse blows, together with Q301, Q352 and D355. I couldn't find any other failed components. Does anyone have an idea or suggestion?
I would like to know the normal series resistance of L1, so I could check if it's still okay.
I had the problem with R302, F1, C301, C302, Q301, Q352 and D355. In a first attempt to fix the supply, I replaced these components. However, the fuse blew again and MOSFETs, transistor and diode failed again.
After some iterations, I discovered that also Q305 was broken (replaced with CSD18532).
In my latest attempt, I also replaced a bunch of other components: U351 & U352 (MIC4424 or UCC27524), the 5 optocouplers, the TOP249, Q302, C303, U401 & U501 (SN74HC02). For Q301, I found SIHP24N65 as a replacement.
However, the problem is still not solved. I get 25V in standby, but on power up, the fuse blows, together with Q301, Q352 and D355. I couldn't find any other failed components. Does anyone have an idea or suggestion?
I would like to know the normal series resistance of L1, so I could check if it's still okay.
Comment