Hello Everyone,
I have a Williams Slot with a Wells garner U3000. Monitor. Monitor is dead. I checked the fuse-and replaced it. as soon as you power it up it blows the fuse. Where to start troubleshooting this? Is this problem confined to the power suppy or the Chassie board? I have some repair experience with Electrohome GO-7 monitors. But no experience with these.
Any help and direction would be appreciated.
Those are usually pretty easy to find...
Check for shorts first...
Check diodes in the power section,
Check electrolytic caps for shorts,
Check Horizontal output transistor for shorts E-B-C
Here is a trick I have used for years. If you cant locate the shorted device there is another way to find the part.
First off USE A ISOLATION TRANSFORMER...
Replace the fuse....
Wire a 100 watt 120 volt regular household lamp in SERIES with the problem monitor.
Turn power on,let run for a few minutes and check for WARM parts. The bad part will have 100 watts of power going thru it
and will get warm. This will NOT burn up boards or do further damage.
Since you are on a iso transformer you are reasonably "Safe", use common sense and check for warm parts with ONE finger or a IR temp probe.
My personal bet?
First... 400 Volt filter caps
Second Horizontal output transistor (one in the heatsink)
Kirk