Hey all,
I have a VX724 monitor which is giving me a headache. I've replaced all electrolytic caps on the power supply / inverter board (including the mains cap which had leaked and the positive lead had corroded off - good job CapXon) and 3 caps on the logic board with fresh Panasonic FR/FM/FC series caps.
Symptoms are pretty straightforward, it will not turn on (no power light) and the power supply is ticking - it is trying to start but there is a short somewhere. One day it just silently went out and didnt have any signs of life.
The caps in the Royer oscillator circuit seem to be fine (no bulges) and the transistors on the flipside of the power board measure out ok.
The thing is, I am getting a continuity reading between +12V and ground on the secondary side. My suspicions point toward the MBR10100CT schottky diode - could it produce such symptoms? How can I measure if it works? Or could there be a shorted winding on the power transformer?
I am sorry but I cannot provide any pictures right now, there are plenty of pictures of the power board on the forum though (VX924 and VX724 seem to have the same PSU)
Thanks!
I have a VX724 monitor which is giving me a headache. I've replaced all electrolytic caps on the power supply / inverter board (including the mains cap which had leaked and the positive lead had corroded off - good job CapXon) and 3 caps on the logic board with fresh Panasonic FR/FM/FC series caps.
Symptoms are pretty straightforward, it will not turn on (no power light) and the power supply is ticking - it is trying to start but there is a short somewhere. One day it just silently went out and didnt have any signs of life.
The caps in the Royer oscillator circuit seem to be fine (no bulges) and the transistors on the flipside of the power board measure out ok.
The thing is, I am getting a continuity reading between +12V and ground on the secondary side. My suspicions point toward the MBR10100CT schottky diode - could it produce such symptoms? How can I measure if it works? Or could there be a shorted winding on the power transformer?
I am sorry but I cannot provide any pictures right now, there are plenty of pictures of the power board on the forum though (VX924 and VX724 seem to have the same PSU)
Thanks!
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