I have this Mustek PowerMust 600 UPS for years, received as defective.
Now, waiting for some parts to repair motherboards/videocards already presented, I decided to seek competent help here to fix it.
The fuse was blowed but I replaced with a similar one.
UPS battery was drained, but I replaced it with a good battery, charged to 12V.
I inspected visually the board and there are no over hot traces of circuits or swollen capacitors; verifying CET / CEP50N06-680FZ not look shorting.
Unfortunately it does not start at all. No beeps, no led light. No communications of the UPS with PC.
I did measurements on CET mosfets and found 2.87V for top3 and ~ 7V for last mosfet(gate to drain, gate to source). The LM 317T MOSFET does not look voltages at all.
Any ideas?
Now, waiting for some parts to repair motherboards/videocards already presented, I decided to seek competent help here to fix it.
The fuse was blowed but I replaced with a similar one.
UPS battery was drained, but I replaced it with a good battery, charged to 12V.
I inspected visually the board and there are no over hot traces of circuits or swollen capacitors; verifying CET / CEP50N06-680FZ not look shorting.
Unfortunately it does not start at all. No beeps, no led light. No communications of the UPS with PC.
I did measurements on CET mosfets and found 2.87V for top3 and ~ 7V for last mosfet(gate to drain, gate to source). The LM 317T MOSFET does not look voltages at all.
Any ideas?
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