Bad Caps and their Symptoms for Common Monitors

z0ner

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While searching for some general repair logs for a 20EZ I stumbled upon this Randy Fromm link that I had to get Wayback info from.

Obviously the general school is to replace all caps when doing a monitor cap kit, but if one was done recently or you're otherwise trying to troubleshoot some bad rework, I thought this would be interesting to document here:

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Electrohome GO7
C511 47uf 160VDC Causes activation of X-ray protection which in turn causes shutdown of horizontal oscillator. Monitor appears dead. Power
supply voltage rises to approx 160 VDC. May also cause weird black areas to appear on the right side or top of the screen.

C905 10uf 250VDC May cause jittery picture.
C107 10uf 250VDC (on neck board) Cannot darken screen completely with screen control.

C504 1uf 50VDC Wiggly picture; especially toward the top of the screen.
Looks as if you should be able to adjust it out with the horizontal frequency control but you can't.

C517 100uf 16VDC Picture keystoned. Sides not straight.
C518 220uf 16VDC Picture keystoned. Sides not straight.
C411 100uf 160VDC Poor vertical deflection.

Hantarex MTC900
C25 47uf 16VDC Jailbars
C36 22uf 35VDC Jailbars
C83 47uf 25VDC Jailbars

Hantarex MTC9000
C34 22uf 160VDC May cause shutdown of monitor. May cause interference bands on screen. Common failure starting now!

Wells-Gardner K4600
C614 33uf 25VDC Keystoned picture. Sides not straight.
C311 1000uf 35VDC Poor vertical deflection (picture doesn't fill screen)

Wells-Gardner K4900
C702 10uf 100VDC Picture bright on the right side and dark on the left side.
C313 100uf 160VDC Poor vertical deflection (picture doesn't fill screen)
C507 47uf 160VDC May cause interference bands on screen.

Nintendo (Sanyo Model 20-EZV)
C407 10uf 160VDC Causes vertical foldover. The top part of the screen is squished.
C302 1uf 50VDC Jail bars
C467 1uf 160VDC Jail bars
C468 330uf 25VDC Jail bars
C469 220uf 25VDC Jail bars
C471 10uf 160VDC Jail bars
C472 100uf 160VDC Jail bars

C459 100uf 16VDC. Horizontal tearing. Looks as if you should be able to adjust it out with the horizontal hold control but you can't.
May cause multiple images.

C303 10uf 50VDC Brightness too low.

Matsushita (Pole Position)
C455 100uf 100VDC Poor vertical deflection.
 
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