ironborn65
Well-known member
Dear all,
I'm trying to fix this PSU but I got strange voltage, here is the story.
Thorough cleaning
I replaced all the capacitors mentioned by Bruce from Branchus Creations.
the two input cracked filters
I replaced the optocoupler OP1, the TDA4605, the MOSFET IRFB040 and L7912 voltage regulator
Diodes DP1 DP3 DP4
The 2 Zener diodes
I had to recreate a couple of pads that were damages by the electrolytes.
It now shows some life now:
The voltage are stable over time.
What can be the cause, a bad voltage regulator?
I do not know much about electronics
thanks for the help
best
PF
do not worry about the empty spaces for the ICs, they have been added
I'm trying to fix this PSU but I got strange voltage, here is the story.
Thorough cleaning
I replaced all the capacitors mentioned by Bruce from Branchus Creations.
the two input cracked filters
I replaced the optocoupler OP1, the TDA4605, the MOSFET IRFB040 and L7912 voltage regulator
Diodes DP1 DP3 DP4
The 2 Zener diodes
I had to recreate a couple of pads that were damages by the electrolytes.
It now shows some life now:
- green wire is -12.5 volt (OK)
- BUT orange wire is oscillating from 7.1 to 7.4 (it's supposed to be 5 volt)
- BUT yellow wire is 19,27 volt, it is supposed to be 12volt
The voltage are stable over time.
What can be the cause, a bad voltage regulator?
I do not know much about electronics
thanks for the help
best
PF
do not worry about the empty spaces for the ICs, they have been added
Last edited by a moderator: