ZHAOXIN PS-3005D DC Power Supply Not working need HELP!!

[monkey1]

Hi everyone I have a (ZHAOXIN PS-3005D DC Power Supply) but it is stuck on 50V which is MAX! it does not adjust to a lower voltage does anyone know where I should start looking ?

Thanks in advance

[Per Hansson]

Re: ZHAOXIN PS-3005D DC Power Supply Not working need HELP!!

This is a 30v max power supply.
You need to provide more details about the problem.
Example: when did it happen, what did you do etc etc.

P.S: These videos might have some useful troubleshooting tips in general about this PS.
https://www.youtube.com/watch?v=g94mpom2Ahs
https://www.youtube.com/watch?v=Fya-4mjV4N4
https://www.youtube.com/watch?v=_HrvuHSywms

P.P.S: The videos linked above show the slightly higher end version with multiple selectable memories with recall function and serial port.
However the internal design is the same.

[R_J]

Re: ZHAOXIN PS-3005D DC Power Supply Not working need HELP!!

Check for a shorted 2N3055

[monkey1]

Re: ZHAOXIN PS-3005D DC Power Supply Not working need HELP!!

Hi Per Hansson & R_J thanks for your really quick reply

Ok so the unit was always working fine up until i was using it to test a (Samsung 55" LED tv) with a "No backlight" issue, Instead of testing each 3.3v Led buld individually I decided to test the complete led strip calculated the leds per strip, I then set the Zhaoxin to a higher voltage probed the wrong (TP) testpoints creating continuity shorting out the unit

since then the unit powers on, amps stay a 0a and the voltage is stuck at full 50v
the voltage is no longer adjustable

if there is photos or any additional info i can provide let me know

Thanks

[CapLeaker]

Re: ZHAOXIN PS-3005D DC Power Supply Not working need HELP!!

probably the pass transistor(s) are shorted.