Monitor was working fine before capping. A little dim and something I would call "jail bars" on the extreme left side of the screen. Hoping capping will improve these.
I washed my 4915 chassis and blow dried it with compressed air. I let it air dry for 3 more days and recapped it last night. I believe it had original caps as the larger ones were glued to the chassis. I also reflowed solder to the header pins, power resistors, flyback, socket, etc.
Only oddities I noticed were the lack of C366 on the chassis even though the cap was included in the kit. D307 bridges the space for the cap (no big deal as I read this cap is often not installed)
R312 (1W 4.7K - vertical output section) looks like it got hot at some point. Measured as 4.5K and I didn't have a replacement that wattage so I left it.
When I powered it back up, there was arcing in the neck connector around pin 7. I had to turn the screen control way back to stop the arcing. All good as the picture was still overdriven at the level where the arcing stopped and I had to turn it down further.
Questions -
This is the first time for me that recapping a chassis caused the brightness to jump to the point where neck connector started arcing. Is this common?
I get flickering general brightness across the whole screen and all colors. Almost like someone is rapidly raising the screen control up and down. I tried running the screen control across its range several times to see if it would clean up the pot but no luck. How can I tell if this is a bad connection somewhere on the chassis vs a bad screen pot in the flyback?
I washed my 4915 chassis and blow dried it with compressed air. I let it air dry for 3 more days and recapped it last night. I believe it had original caps as the larger ones were glued to the chassis. I also reflowed solder to the header pins, power resistors, flyback, socket, etc.
Only oddities I noticed were the lack of C366 on the chassis even though the cap was included in the kit. D307 bridges the space for the cap (no big deal as I read this cap is often not installed)
R312 (1W 4.7K - vertical output section) looks like it got hot at some point. Measured as 4.5K and I didn't have a replacement that wattage so I left it.
When I powered it back up, there was arcing in the neck connector around pin 7. I had to turn the screen control way back to stop the arcing. All good as the picture was still overdriven at the level where the arcing stopped and I had to turn it down further.
Questions -
This is the first time for me that recapping a chassis caused the brightness to jump to the point where neck connector started arcing. Is this common?
I get flickering general brightness across the whole screen and all colors. Almost like someone is rapidly raising the screen control up and down. I tried running the screen control across its range several times to see if it would clean up the pot but no luck. How can I tell if this is a bad connection somewhere on the chassis vs a bad screen pot in the flyback?


