Had K7197 Chassis Board Repaired, But Still Doesn't Work

scottkeen

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Had K7197 Chassis Board Repaired, But Still Doesn't Work

I sent off the chassis board from my 25K7197 to one of the members here to be repaired. I received it back last week and plugged it in, but it still doesn't work.

The conditions are the same as when I sent it out. I can hear the monitor energize, but there's nothing on the screen at all. There's not even a flash when disconnecting or connecting power.

Something new I noticed after it was repaired was that there's an electrical burning smell. I started feeling around the components and capacitor C38 is very hot and the burning smell is coming from that area.

The member who repaired it said he had it working for a couple of days straight. But it didn't work when I got it back so I don't know if the board was repaired, got damaged in the return shipment, or if there's something wrong with my CRT tube. At one point before I sent it off for repair, I had it working briefly but then it would flash and shutdown (I think the term is collapse?)

So I'm still hoping to get this working but I can't sink any more money into this. Before I sent it out, I replaced caps with a cap kit, flyback, voltage regulators, and more caps and resistors, and reflowed every single solder joint on the main, remote, and neck boards. Between the repair cost and all the parts I've bought, I've sunk $160 into this and it still doesn't work.

Is there anything else to try that doesn't cost more than $20 bucks?

Next question:
This non-working monitor is a 25K7197. I have a working 25K7191. Are the boards interchangeable and do I risk breaking my working 25K7191 if I switch boards just to trouble-shoot whether it's the CRT or not?

Sadly, if this is gonna be more throwing-good-money-after-bad, then I'm better off pulling the monitor out and taking it to the dump. Hate to dump a 25" arcade monitor.
 
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