I just started on a 27" Wells U3000. This is the first time I've worked on one of these. Does anyone have a cap list?
When powered up, it's doing the deadly tick, tick, tick, etc. I pulled the monitor and noticed the big filter (on the power supply board) cap oozing out it's top. I replaced it....and found the 7watt/10K ohm resistor totally open. I also replaced that and fired it up.....still ticking. I checked the HOT, it's good. Someone has replaced some of the smaller caps on the power supply board and the values do not match the schematics I have.....some are not even close.
I pulled the power supply connector to the main chassis, and fired it up to check the voltages. It no longer ticked, but my voltages were doubled.....the 120V was approximately 240V.....the 22V was 45V. I've never worked on one of these, so I don't know if that is "normal". It seems high to me. I decided to put a load on the power supply. I connected my work light to the 120 volt output at the connnector with the chassis disconnector. With just my work light connected to the power supplies output....I got the tick again.
So, I assume the power supply board is bad? Am I running down the right path? And....anyone have an actual cap list?.....maybe just for the 5-6 caps on the power supply board. Thanks!
Edward
When powered up, it's doing the deadly tick, tick, tick, etc. I pulled the monitor and noticed the big filter (on the power supply board) cap oozing out it's top. I replaced it....and found the 7watt/10K ohm resistor totally open. I also replaced that and fired it up.....still ticking. I checked the HOT, it's good. Someone has replaced some of the smaller caps on the power supply board and the values do not match the schematics I have.....some are not even close.
I pulled the power supply connector to the main chassis, and fired it up to check the voltages. It no longer ticked, but my voltages were doubled.....the 120V was approximately 240V.....the 22V was 45V. I've never worked on one of these, so I don't know if that is "normal". It seems high to me. I decided to put a load on the power supply. I connected my work light to the 120 volt output at the connnector with the chassis disconnector. With just my work light connected to the power supplies output....I got the tick again.
So, I assume the power supply board is bad? Am I running down the right path? And....anyone have an actual cap list?.....maybe just for the 5-6 caps on the power supply board. Thanks!
Edward
