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Monitor repair logs

nem

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I'll keep this list up to date, if anyone else wants to post up their logs.

Hantarex

Hantarex Polo 25/28, vertical collapse
Hantarex Polo 25/28, image will not sync

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I always replace all electrolytic capacitors and go over solder joints whenever a chassis passes through my hands. It's absolutely a shotgun approach and lacks finesse, but ultimately it fixes at least half of these darn things.
 
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Hantarex Polo 25/28

Problem: vertical collapse

Solution: Internet tells me usuals suspects are R167, R177 and possibly the vertical IC. I checked both resistors in circuit, they were fine. I replaced the vertical IC to no benefit. This is when someone smarter than me suggests to check the voltage coming in.

hantarex_polo_25v_missing.jpg


There should be 25V. There wasn't. Went upstream towards the power supply and found this guy, L105:

hantarex_polo_l105.jpg


On earlier revisions there isn't a resistor here at all. It doesn't actually show on the schematic. It was an open resistor. Power comes in, nothing comes out. Pulled that out and replaced with a wire link.

Full schematic can be found on AO wiki: https://wiki.arcadeotaku.com/w/File:Hantarex_polo_25-28_schematic.png
 
Hantarex Polo 25/28

Problem: image will not sync. I couldn't get the image to lock when adjusting horizontal and vertical hold. It was to the side and it would constantly roll either up or down.

Solution: IC104 (TDA2593) was buggered. It's DIP-16, so I suggest putting a socket in there if you're taking it out.

hantarex_polo_ic104.jpg
 
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