L
lj_robins
- Jan 1, 1970
- 0
Hi,
I'm trying to repair an ATX power supply that has been dying a slow
death, turning the power switch on the back off/on has allowed the
computer to boot up for a couple of months but the supply finally died.
Shorting the two power wires on the bulk connector that normally make
the supply come on just make the supply give a little "Ziiiiiit" noise
then a very faint high frequency squeal can be heard.
I pulled the heat sink with the three transistors (two transistors and a
MOSFET) all three tested fine. I then pulled the heat sink with the
three rectifiers, one tested in the normal range but the other two were
testing at 0.99x and 0.2xx, I would normally expect these to be in the
0.4xx or 0.5xx, sometimes a low 0.6xx, is this normal?
The two rectifiers in question are: SB1040 and SB1640.
Any help would be appreciated.
-Landon
I'm trying to repair an ATX power supply that has been dying a slow
death, turning the power switch on the back off/on has allowed the
computer to boot up for a couple of months but the supply finally died.
Shorting the two power wires on the bulk connector that normally make
the supply come on just make the supply give a little "Ziiiiiit" noise
then a very faint high frequency squeal can be heard.
I pulled the heat sink with the three transistors (two transistors and a
MOSFET) all three tested fine. I then pulled the heat sink with the
three rectifiers, one tested in the normal range but the other two were
testing at 0.99x and 0.2xx, I would normally expect these to be in the
0.4xx or 0.5xx, sometimes a low 0.6xx, is this normal?
The two rectifiers in question are: SB1040 and SB1640.
Any help would be appreciated.
-Landon