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Wells Gardner K7000 intermittent colour

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K1ngarth3r View Drop Down
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    Posted: 14 Oct 2021 at 2:25pm
Looking for some advice for my K7000 25” monitor with a Zenith tube.

Around a year and half ago I recapped it and put in a new flyback and reflowed the monitor v-hold pot to fix a sync issue (but didn’t reflow the rest of the board o neckboard).

Over past couple of months I had been intermittently been loosing Red and now occasionally Green. If I leave the cab on for sometime the colour may come back strong.

I have removed the chassis today and was going to reflow the entire board including neck boards. 

Short of trying the chassis on another tube, is there any other maintenance I should be doing?

Maybe testing the colour drive transistors or input transistors?
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big10p View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote big10p Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2021 at 2:39pm
Probably worth checking neck pins and socket have good connections.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote K1ngarth3r Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2021 at 3:07pm
It looks like I have some serious cold solder joints on the input headers Embarrassed

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Post Options Post Options   Thanks (0) Thanks(0)   Quote gunblade Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2021 at 3:08pm
most people tend to miss the rgb header bad solder joints
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Post Options Post Options   Thanks (0) Thanks(0)   Quote big10p Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2021 at 3:27pm
Heh, looks like you found the culprit.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote K1ngarth3r Quote  Post ReplyReply Direct Link To This Post Posted: 14 Oct 2021 at 4:40pm
Yep, it's fixed Tongue


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