Monitor problems (WG 19K7203)

davespicer

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I'm having trouble with a Wells Gardner 19K7203 bought recently. It was new, although it was likely to have been in storage for maybe 5-6 years. I wouldn't have thought that would be long enough for caps to dry out.

Symptoms are as follows:

- Any full-level colour filling the screen appears on the top few lines only and is cut from the remainder. For example, white text on a solid blue background will appear as yellow text on a black background. Colour bars are displayed correctly and a problem only occurs when there's a large amount of a single colour.
- With normal video, horizontal dark bands appear at times. These are content-dependant and do not move when the display is static.
- There is a high pitched squeel from the monitor when the display is predominantly dark. Volume depends on brightness level, starting as a clicking sound at mid brightness and developing to a full-on screaming noise when dark. The same sound can be heard at full volume on startup and lasts until the monitor warms up.

The Wells Gardner troubleshooting guide is not particularly useful. I did randomly swap out C013 as one of the suggested squeel cures with no change.

There are no obvious signs of cracked solder joints, which I've heard can be a problem with the later WGs.

Any monitor gurus care to comment?

I'm looking for possible diagnostics rather than suggestions to shotgun the caps. I have the option of returning the monitor for a refund and would like to work out likely cost of repair before I decide what to do.

See attached pics. The text screen should be white on blue. The other picture shows the dark bands.

--
Dave
 

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Last edited:
Before you go any further, change all the caps and reflow the joints. If this monitor is new and you are seeing joint cracks, this should be a pretty good indication that the storage conditions were not great. You'll waste more time shotgunning caps and retesting the chassis each time than you will just changing em all.
 
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