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Update--R301--pulled and tested ok, VR9 pulled and tested at 2K so thats ok...I swapped in a different IC4-no change.. Could a bad flyback do this? I know its brand new but maybe I got a bad one out of the box?

R301 measures 177.8 (in circuit) I checked around VR9 and it looks ok. Interesting thing--if I measure resistance across R101 you can see the value rise (as if you are charging a cap) and it peaks at 4.02Kohm. When I do the same thing on a known working chassis, it continues to rise above...

Yup--Pulled R89-ok, r97-ok, r104-ok R103 gets really toasty really fast--I've swapped in a different c55 with no change (I can't imagine I have three bad c55's when they rarely go bad--can I???) I'm thinking my d19-d22 diodes are testing fine and failing under load?--just guessing here..

Its a K7191 with a P538 board. When I plug it in, I get 40VDC when I check the red wire on R301--R103 also heats up pretty sharply. So far: Capkit done, flyback changed, IC4 checked=ok, R103=3.0ohm, D19-D22 checked and ok, C55 swapped with another one, reflowed a bunch of joints but they...

I pulled this from a defender and have never worked on one before so I wanted to poke the web before diving in. I haven't done anything to it as of yet.. on power up I hear the crackle of the tube and see a faint neckglow but there is no picture?? Any ideas? I've heard there are no...

Hopefully this thread isn't too old to be considered necro-threading :) Anyways, I have a 30VDC led lit and the knocker works when isolated. was your led lit even though the transistor itself was pooched? Just trying to figure out if the problem is on the power supply side (even though the...

hang on part out Do you mean the actual sound board or the amplifier that sits on the bottom. I Have both but no idea if its working or not (dead machine--mainboard is the problem I think). Is there a way to test them if the machine is dead? I'm probably parting out the machine so if there...

I just received this machine after being stored for about a decade in a dusty (but dry) barn. Took a shot and powered it on and the screen comes up but the display is all scrambled. I pulled the boards and re-seated all the removeable chips--no difference. Does anyone have experience with...

Thanks for replies! I capped it, reflowed other parts and now she's good as new! Not sure where the actual problem was but the shotgun approach did the trick..

I just picked up a u2000 and can't get the picture to hold horizontally or vertically..I replaced the H. hold pot --got a bit better, checked q700, it's fine, checked d700, it's fine. I'm just curious what the gurus say should be my next step? (it's wired to a jamma board currently, with the...