Xerox XM3-22wB 22" Monitor - Clicking from speakers (no display)

[Ken Laszlo]

Hello everyone

The display I am troubleshooting is the same one mentioned in this thread:
https://www.badcaps.net/forum/showthread.php?t=10851

I am trying to repair a faulty Xerox XM3-22wB 22" Monitor.

Upon applying power to the unit, a large repetitive clicking sound is coming from the speakers but there is no picture and no LEDs lit up.

I have replaced all of the capacitors on the output side of the power supply, but the problem still remains. (Not touched the caps for the backlight though).

Further fault finding:
Upon applying power to the the power supply board disconnected from the main chassis, both power level (14V and 5V) appear Ok and stable.
When connecting the power supply board into the main chassis, the 14V is fine but the 5V level is dropping to about 1.8V.
All output capacitors (there are three) have been replaced on the 5V output side.

I wondered if anyone could assist any further please, as this is where I have got up to. The person I got the monitor from said that it was working but had been stored in a shed for about 2 months - Maybe it suffered from cold/damp during this time?

Thank you for any assistance
Ken

[Ken Laszlo]

Re: Xerox XM3-22wB 22" Monitor - Clicking from speakers (no display)

Oh well, I managed to fix it.
The issue was C206, a 22uf 50V capacitor on the input side of the power which I had not yet replaced (it was not bulging or looked 'bad'). I replaced it and the unit is now working.

Best wishes and good luck all
Ken

[budm]

Re: Xerox XM3-22wB 22" Monitor - Clicking from speakers (no display)

Oh well, I managed to fix it.
The issue was C206, a 22uf 50V capacitor on the input side of the power which I had not yet replaced (it was not bulging or looked 'bad'). I replaced it and the unit is now working.

Best wishes and good luck all
Ken

That is the startup/running cap for the SMPS, very common failure cap.