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It could be degraded connection inside the video cable. I had experience similar symptom with my M1212. And got fixed after unplugging the video cable on both ends and reconnecting again.

Is it safe to replace it with a 25A 1200V transistor commonly used in induction cooker?

Added a "stub" there, but not necessary if your layer of eproxy is thick enough.

My Apple CRT monitor M1212 is dead with a suspected shorted NPN transistor (Motorola MJF16206). I'm trying to find a replacement but to no avail. Does anyone know what model of NPN Transistor is compatible w/ Motorola MJF16206 that I can buy from the market? According to its PDF, it's a NPN...

I think most eproxy would do the job. I simply grab a random one from a local store. But now, I hv a new problem. It can no longer power on.

A belated update: re-solder didn't work for me. But after applying a thick layer of eproxy according to @Byrd, it stops humming. So, this settles the problem for now.

Got it! Readily makes sense to something doesn't.

Well, confused again! I thought between two connector boxes is a mini-din-3 cable. But this connector kit package suggests it's a mini-din-8 (NOT mini-din-3)?

I was under a false impression that one needs those connector boxes to use AppleTalk. Now, MD-8 is really a variant of RS232. Good to know!

Thanks! Let me find out if this will be another annoying experience. My guess is that it always looks easy until one tries. BTW, had u tried open a connector box successfully without breaking it? It has no screws and I dare not to force it through.

In the context of using AppleShare (NOT terminal style serial connection), can two vintage Macs AppleTalk to each other thru a Min-Din-8 crossed-over cable? This means one can get away w/ using any connector boxes? I know u need these boxes when say networking more than two Macs, but not sure...

Hello, want to test your sense of color? 110/220/330 Ohms

U mean this? https://usermanual.wiki/Document/AppleM1212MonitorSchematic.2035905086

That will do. Thanks for the quick response!

Can anyone share a dip switch mapping for this VGA-to-Mac Adapter? This particular adapter got only 6 dip switches. Thanks!

According to this video, flyback transformer tends to go bad eventually. Is it possible to get a new compatible replacement nowadays? Looking at ebay, they don't seem to me having the same pins out configuration to fit necessarily and some have two adjustment knots not present in the original...

Great, will wait for your update. BTW, I find this capacitor list. I might replace them while the case is open. https://tinkerdifferent.com/resources/macintosh-color-display-m1212-capacitor-list-1-645-346-13.25/

Thanks! Your idea looks hopeful. I'll try to get one locally because I'm not in the US.

Before I proceeded to buying an internal terminator block as suggested, I thought I would give it another try. I came up with a pretty good trick (I thought) by pulling out the PCB from the dead Apple HD that I was trying to replace. And plugged this PCB to the last connector of my 50-pin...

My M1212 also suffers similar noise issue. Did yours get fixed with silicon sealant and re solder?