G07 vertical collapse

dyno

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My g07 has gone into vertical collapse, I have tested the vertical output transistors and they are good, tested the fr401 68ohm resistor and it is good and replaced cap 302 which I have heard could cause the problem. What should I be looking at now besides a full cap kit? I have read ic 501 could be the problem but it is rare for it to be bad.
 
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Yep, but that wouldn't cause vert collapse. Check the entire thing for cracks, and do continuity checks from the vert yoke pins back along those traces...
 
My monitor is mounted horizontally, and the line runs up and down the screen (north -south), this is vertical collapse isn't it or is this horizontal collapse? I think I have checked everything that would cause vertical collapse and not found anything bad.
 
My monitor is mounted horizontally, and the line runs up and down the screen (north -south), this is vertical collapse isn't it or is this horizontal collapse? I think I have checked everything that would cause vertical collapse and not found anything bad.

If the line runs the length of the long dimension, it is vertical collapse. If the line runs the length of the short dimension it is horizontal collapse.

Which do you have?
 
It runs the length of the short dimension, so I have horizontal collapse and have been chasing the wrong problem. I feel like an idiot. What could cause a horizontal collapse? I found some info on horizontal collapse and it says a cap kit might fix it or the width coil is shot, would that be a good start?
 
I can confirm it is horizontal collapse, I found a thread where the image on the monitor is exactly the problem I have and dokert you said it is horizontal collapse in that thread.
 
Here is a link to the RF flowchart

http://www.rotheblog.com/images/arcade/misc/flowcharts/g07_flowchart.pdf

I have encountered a GO7 CBO with collapse just like shown in the chart, and FR 401 checks out good. Next move would be to pull X401 and X402 and check them.

Interestingly, I also have encountered a Neotec NT 27E with the same collapse.... will delve into that one soon.
 
Checked all that which causes vertical collapse, what I just realized is that I have horizontal collapse. Thanks for the link:)
 
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Here is a link to the RF flowchart

http://www.rotheblog.com/images/arcade/misc/flowcharts/g07_flowchart.pdf

I have encountered a GO7 CBO with collapse just like shown in the chart, and FR 401 checks out good. Next move would be to pull X401 and X402 and check them.

Interestingly, I also have encountered a Neotec NT 27E with the same collapse.... will delve into that one soon.

Horizontal collapse has nothing to do with vertical trans X401 and X402.

Most likely your Horizontal width coil is bad, or you are having cap failure. Let's see pics of this wonderful chassis please, top and bottom.
 
This is what is happening:

collapsedgo7.jpg


Since he said his monitor is mounted vetically, and the line runs north and south, then it is the same as mine = same as the flowchart. And the flowchart says to look at X401 and X402 specfically, and the suggests to check all 400's. Then possibly look to IC501.

It has been capped, new fly and HOT too. And for the record, I recently aquired this chassis, and it will heading back to it's origins. It looks just like any other re-capped chassis, nice and clean.
 
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It runs the length of the short dimension, so I have horizontal collapse and have been chasing the wrong problem. I feel like an idiot. What could cause a horizontal collapse? I found some info on horizontal collapse and it says a cap kit might fix it or the width coil is shot, would that be a good start?

This is what is happening:

collapsedgo7.jpg


Since he said his monitor is mounted vetically, and the line runs north and south, then it is the same as mine = same as the flowchart. And the flowchart says to lool at X401 and X402 specfically, and the suggests to check all 400's. Then possibly look to IC501.

Negative my friend, look again. You do have vertical collapse, he has horizontal collapse.

Don't kill yourself using the flow chart, it is NOT gospel and should only be used as a guide just like the one I made for Sanyo's.
 
Looks like I have found the problem, took a look at the width coil and the wire is broken. I will replace it later tonight and hopefully that solves the problem. Thanks again Dokert for pointing me in the right direction, to the width coil:)
 
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