WG K4600 Vertical Collapse

cyberbmxer

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Monitor was working just in serious need of cap kit.
capped monitor, plugged it in. fuse popped immediately. then realized I plugged in the wires on the yoke wrong....
ok, put the yoke wires back in correct order. replaced fuse. start monitor and its in vertical collapse. (line right across the center of the screen)
pulled tr305,tr307 and tr352 they all checked out fine. I poked around on the XY Card and didn't see anything else wrong. I don't really have any extra parts to throw at it and I am very average at monitors. I don't know where to check next?
 
Have you checked the resistance across the vertical deflection coil? It should be in the 7-8ohm range. If it reads around 1K with the chassis connected to the yoke (but off), then the vertical coil is open.
Working back in the vertical circuit, if tr305 and tr307 test good, then tr306 is next. Also check diodes x304 and x305. The voltage at the cathode of diode x306 should be 30V -- something else to check.
 
Have you checked the resistance across the vertical deflection coil? It should be in the 7-8ohm range. If it reads around 1K with the chassis connected to the yoke (but off), then the vertical coil is open.
Working back in the vertical circuit, if tr305 and tr307 test good, then tr306 is next. Also check diodes x304 and x305. The voltage at the cathode of diode x306 should be 30V -- something else to check.
thank you very much. I will start down that path. ok. right off the rip I found an issue. I C311 and C113 were in the wrong place. I swapped them. but no fix.
will look a the diodes see what i Find.
 
Where is the vertical coil? and the C633 bi-polar capacitor I have a regular capacitor in there. is that causing my issues? I installed a cap kit that I had from 2009 Bob Roberts. I should have looked up the instructions. I was short the bipolar cap. @wpmcnamara
 
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Assuming C633 hasn't failed, using a regular capacitor instead of a biplor wouldn't cause the vertical deflection to fail. HOWEVER, putting a regular electrolytic capacitor in place of a bipolar is a recipe for an exploding capacitor, or at least a leaky failing on. Normal electrolytics do not like reverse voltage. If you read about someone having reversed a capacitor while doing a cap kit and it exploding... C633 is being reversed 60 times a second. It's not long enough to make it immediately fail, but over time it will. You certainly want to get it replaced with a non-polarized ASAP. Personally, I would probably put the original bipolar back in, if you still have it, while you wait on a new replacement.

If C633 has failed, it could certainly cause problems, though I'd have to look closer at the circuit to figure out if it would result in full vertical collapse.
 
Assuming C633 hasn't failed, using a regular capacitor instead of a biplor wouldn't cause the vertical deflection to fail. HOWEVER, putting a regular electrolytic capacitor in place of a bipolar is a recipe for an exploding capacitor, or at least a leaky failing on. Normal electrolytics do not like reverse voltage. If you read about someone having reversed a capacitor while doing a cap kit and it exploding... C633 is being reversed 60 times a second. It's not long enough to make it immediately fail, but over time it will. You certainly want to get it replaced with a non-polarized ASAP. Personally, I would probably put the original bipolar back in, if you still have it, while you wait on a new replacement.

If C633 has failed, it could certainly cause problems, though I'd have to look closer at the circuit to figure out if it would result in full vertical collapse.
well, Thats great to know! I wont be firing that up again until the new cap arrives. i threw out the old one 3 weeks ago when I did the kit. going to measure the yoke resistance today too. make sure that is within spec. thank you.
 
First pic is with game pcb second with pattern generator.
 

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Ok, I received my order from Arcade Parts and Repair.
I have replaced the polarized cap 633 with bipolar cap.
Replaced transistor tr306 with a tip31c (it tested good but I had a new one to replace it with)
Replaced line filter cap (hope I did it right.) Could someone confirm or deny?
All header pins were reflowed (removed old solder and flowed with new solder)
Ohmed yoke it's in spec. I'm not positive the yoke wires are in correct order. Can some please confirm.
I also need to set B+ can I do that with the yoke wires off?
Thanks. Don
 

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Based on the picture I took of my 4605, your yoke wires are not in the correct locations. I cannot definitely say yours are in the incorrect locations due to possible hardware variations, but it sure looks that way to me.

4605_Pic_Cropped.jpg
 
Thank You. I was getting frustrated.
I should have ordered the pots from you last week. :( you will be seeing another order tonight.
 
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