Bullwinkle
Member
k4900 vertical collapse? could it be a flyback issue?
I'm working on a K4956 that I'd stored away a few years back. pulled it from the shelf and essentially got what's in the vid clip below. I capped it, reflowed solder on all the connectors/pin headers and on the neckboard pins. The colors look brighter..but still same issue. Changed out Q303, no help. I didn't swap out Q302 as I thought it was part of the horizontal circuit.
If you listen to the video, you can hear a "snapping" as it refreshes the screen. Is this all possibly being caused by a faulty flyback? You can't actually hear the "snapping" when standing next to it, but I suspect it might be causing interference with my iPhone's camera.
Any suggestions on what to check next? would R313 cause something like this?
I'm working on a K4956 that I'd stored away a few years back. pulled it from the shelf and essentially got what's in the vid clip below. I capped it, reflowed solder on all the connectors/pin headers and on the neckboard pins. The colors look brighter..but still same issue. Changed out Q303, no help. I didn't swap out Q302 as I thought it was part of the horizontal circuit.
If you listen to the video, you can hear a "snapping" as it refreshes the screen. Is this all possibly being caused by a faulty flyback? You can't actually hear the "snapping" when standing next to it, but I suspect it might be causing interference with my iPhone's camera.
Any suggestions on what to check next? would R313 cause something like this?

