Franklin MG-120TS Green Monochrome composite monitor [Repair in progress]

phunguss

TinkerDifferent Board Vice President
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Dec 24, 2023
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Stillwater, MN
I have been looking for info on this monitor... got it free from Free Geek Minneapolis some time ago when they still had a "free shelf". Sticker says "does not power on".
Franklin MG-120TS back.jpg

After removing the swivel base (unnecessary), two screws along the bottom bezel from the back, and the three white screws you see in the pic above, the shell came off the back with the tube laying on a padded surface, face down. The fuse and the RIFA cap is intact. I removed the power transformer and it tones out correctly for continuity. It was a little dusty. It looks like 24 electrolytic caps and two ICs to possibly replace.
Franklin MG-120TS components.jpg

I removed all caps and my simple Fluke showed all tolerances within 10% of specifications, but I cannot test ESR with it. So I will replace all caps. Two ICs ordered are TDA1180P and TDA1170LN (N). Here is the solder side of the board in case anyone needs it. It is a composite of two images, enhanced to emphasize the screen printing for component identification.
MG-120T-back.jpg

And the neck board.
Franklin MG-120TS neck.jpg

A list of the caps is attached.
 

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