Hello everyone. I am a new troubleshooter and have fixed about 10 Viewsonic monitors all by replacing caps. This new monitor I have here to fix is a Viewsonic VG930M-3. It has the 2 seconds to black problem. I already replaced all the caps with Panasonic and Nichicon caps. I also replaced the large filter cap, still the same issue. I have determined that the three diodes on the power supply/Inverter board are passing electricity both ways and high values for passing voltage, so they are bad. I can also see a browning of the circuit board at the leads of one of them. Seems I have a shorted output transistor as well. I think I can identify and order one of those. I am getting 5V from the two red power supply pins, as I should. My problem is trying to order new diodes for this. How do I know what to order from Digikey? They have numbers on them but I have no idea what they mean. I can order caps on Digikey but diodes are a whole 'nother animal. Can anyone help me out? The screen looks fine for the two seconds it works, I would like to save it. Thank you.
Charles
Charles
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