Shupac
Active member
A friend asked me to work on a dead 25" with a Wei-Ya chassis. The collective wisdom on KLOV suggested that the old chassis wasn't worth the time or effort to fix, so I ordered a new one (model 429H). Rather than take any chances with its cheap brand-X electrolytic capacitors, I replaced all the larger ones with Nichicons before ever turning the thing on. I also upgraded the B+ filter capacitor to a 680 uF 200 V Nichicon.
I then discovered that the horror stories about this monitor overheating are true. Within 15 minutes, R804, the 25W 140 ohm resistor in the power supply, got so hot it melted through the insulation on the nearby 120 VAC cable. Fortunately the smell of burning plastic alerted me to the problem and I was able to power the thing off before anything shorted out or caught fire.
I could not in good conscience call this monitor "fixed" and return it to my buddy knowing it has this problem -- I didn't want the poor bastard's house to burn down just because he wanted to play some Golden Tee. So I decided to try upgrading the original power resistor with a beefy 50W, 150 ohm chassis-mount resistor from Digi-Key (p/n 696-1462-ND, $3.89). This thing is a beast, big and heavy with cool-looking vanes carved in the aluminum. I soldered on a couple hefty wires, routed them to the pads where the 25W resistor had been mounted, and bolted the new resistor to the chassis heatsink. Some drilling was required.
It seems to be working. I can't attest to long-term reliability, but I can say that the 50W resistor runs cool enough that you can touch it, which gives me hope.
The picture is excellent. I hope it stays that way.
I then discovered that the horror stories about this monitor overheating are true. Within 15 minutes, R804, the 25W 140 ohm resistor in the power supply, got so hot it melted through the insulation on the nearby 120 VAC cable. Fortunately the smell of burning plastic alerted me to the problem and I was able to power the thing off before anything shorted out or caught fire.
I could not in good conscience call this monitor "fixed" and return it to my buddy knowing it has this problem -- I didn't want the poor bastard's house to burn down just because he wanted to play some Golden Tee. So I decided to try upgrading the original power resistor with a beefy 50W, 150 ohm chassis-mount resistor from Digi-Key (p/n 696-1462-ND, $3.89). This thing is a beast, big and heavy with cool-looking vanes carved in the aluminum. I soldered on a couple hefty wires, routed them to the pads where the 25W resistor had been mounted, and bolted the new resistor to the chassis heatsink. Some drilling was required.
It seems to be working. I can't attest to long-term reliability, but I can say that the 50W resistor runs cool enough that you can touch it, which gives me hope.
The picture is excellent. I hope it stays that way.
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