No Video After Cap Kit

zenomorp

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Hey guys. I got a K7000 series 25" chassis that I just capped. Worked fine before, but now there is no picture. Comes on just fine, but the screen is dark and there is no image. The screen pot turns up the screen, but still no image. The brightness and contrast pots don't work either. Any ideas? All my caps are in correctly and this is the 5th cap kit I have done and the first issue I have ran into. Thanks - Mike.
 
Cold solder joint. Double check your headers especially...but check all your work and any components in the vicinity.
 
Check the solder pads on the R89 and R101 resistors. These two points are absolute shit on this chassis and you most likely knocked one of them loose. If you hear your monitor chattering(you might even have neck glow) but no picture, your problem is right there. Scrape the hell out of the solder pads and bridge the areas beyond the initial size.
 
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Check the solder pads on the R89 and R101 resistors. These two points are absolute shit on this chassis and you most likely knocked one of them loose. If you hear your monitor chattering(you might even have neck glow) but no picture, your problem is right there. Scrape the hell out of the solder pads and bridge the areas beyond the initial size.


Thanks for the suggestions. I re-flowed EVERY pad I compromised as well and the R89 and R101. Still no picture. The brightness and contrast pots work now, but still no picture.
 
Are you getting any chatter out of the monitor? If not, desolder a leg of the D10 diode and try the chassis again. If you get a picture now, your voltage regulator is dead and this is very common on this chassis as well.
 
Are you getting any chatter out of the monitor? If not, desolder a leg of the D10 diode and try the chassis again. If you get a picture now, your voltage regulator is dead and this is very common on this chassis as well.

Not quite sure what you mean by "chatter." When the monitor warms up, the image gets a little blue and starts to flicker between slightly blueish and black. There are no game images at all in any aspect. I can plug in the video cable and unplug it with no change in video or activity. Basically, the chassis is acting like it's not receiving any input.
 
Ahhh, you started off saying that you had no picture but you actually do have something even though it doesn't look right. Now you need to look at your cap work, did you bridge any solder joints? bad caps? cap in backwards? Cap in the wrong location? Header pins all reflowed? Are you ready to pull your hair out over this POS? The 7000 chassis makes a soft chattering sound as it runs, you're getting an image so at this point it doesn't matter.
 
Ahhh, you started off saying that you had no picture but you actually do have something even though it doesn't look right. Now you need to look at your cap work, did you bridge any solder joints? bad caps? cap in backwards? Cap in the wrong location? Header pins all reflowed? Are you ready to pull your hair out over this POS?

I have neck glow and a stable, dim blue screen. No game images. All the remote controls work. I installed another chassis and it worked fine, so I don't have a problem with my cables or machine. It's the K7000. All of the caps are in correctly and I re-flowed all the joints. I am pretty sure I didn't create any bridges. What are the header pins?
 
I have neck glow and a stable, dim blue screen. No game images. All the remote controls work. I installed another chassis and it worked fine, so I don't have a problem with my cables or machine. It's the K7000. All of the caps are in correctly and I re-flowed all the joints. I am pretty sure I didn't create any bridges. What are the header pins?

The header pins are the pins on the chassis where the video input connector plugs on. It could also refer other pins like those on the chassis such as where the yoke connector plugs on.
 
The header pins are the pins on the chassis where the video input connector plugs on. It could also refer other pins like those on the chassis such as where the yoke connector plugs on.

Figured as much. I metered them all and they were good.
 
Check the neckboard, especially if you had one with a cap on it. Look for cold solder on the socket...
 
Oops, missed that.

Crank the screen control?

Yes, All the pots on the remote board work as advertised, including the screen pot on the flyback. The chassis works fine, just no game images. It's acting like the video cable isn't hooked up.
 
Did you try my suggestion?

Other than than, I would do a continuity check from every per you soldered to the next on in the trace. I had a different model that did something similar, and it turned out that a pad had separated from the trace, but didn't look like it...
 
*SOLVED* Oh man. What a dumbass I am. Turns out that it was simply the sync wire was on the wrong header pin. Usually, you can use the last pin on the first set of pins for the sync, but on the K7000 series, it seems you have to use the most forward one on the set of three. Works fine now. Thanks for all the suggestions. I appreciate all the help.
 
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