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Makvision 29" (27") tri-mode arcade monitor - Fuse blows on replacement
cruppel:
Hi all! Im here humbly requesting some help with my Makvision 29" (27") tri-mode arcade monitor. I had everything running perfectly yesterday until I tried to move my arcade cabinet back into its corner while it was on (yes, I know...). As I moved the cabinet, I saw a flash from the fuse area and the monitor turned off. I checked and saw that the fuse was blown so I ordered new fuses that matched (F4AL250V). I just tried the new fuse and it blew immediately. I know my way around a circuit board, but not a CRT. Can anyone please help direct my next debug steps? I'd really appreciate it!
grantspain:
if you moved the cab then the chassis has either moved from its home and is shorting or some wiring is shorting
cruppel:
Ok so I got the monitor out of my cabinet. I dont see any obvious damage except for the fuse. After poking around with my meter, it looks like AC/N and A/C are shorted. Any tips for me?
One more note, FG is also shorted to the chassis. Not sure if this is how it is supposed to be.
Heres the schematic: https://na.suzohapp.com/pdf/service_pdfs/M3129DF-TS.pdf
grantspain:
i know this chassis very well, i doubt the ac is shorted as such
first thing to check is the bridge rectifier and FET in the power supply
you can also check the PTC for a short
cruppel:
Thanks for the advice, grantspain. Just to be sure, you're talking about DB1 and Q1 in the schematics, correct? From what I've googled, it seems like the HOT may be the issue (which I think is Q1). Also... apologies, but what is the PTC?