karoshi
Student
Hi there. I've recapped one of my New Net City Toshiba PF D29C051 in an effort to improve minor geometry issues, however, I seem to have damaged or broken something. I'm hoping some of your guidance can help me narrow down the culprit.
Post recap, the picture was bouncing around like crazy, until I left it on for about 45 seconds, when the picture went black with a very faint, tiny white line at the top of the display. It's sending power to the yoke and it doesn't appear that I shorted the high voltage.
Here's a video of the same signal being sent to two machines, after the cap. Yikes.
https://drive.google.com/file/d/1KZaqdTGcWxvviAG9NSfAKmeBuP-Wi4-V/view?usp=sharing
Here's a video of the monitor powering on and a brief inspection of the cables attached, while I looked for any other pots that might help me adjust the sync issues.
https://drive.google.com/file/d/10wKvXYHUqh0i9ITYFB0X4mzpu2trrKQZ/view?usp=sharing
Attached is a photo of what it looks like now.
The only obvious error I made, was I initially seated the monitor-service/calibration cable into the wrong port. After the screen stopped displaying a picture, I corrected the cable placement, but I no longer got any picture on screen at all.
Some notes:
- I bought my caps at a local electronics shop, and the larger ones I got online from Mouser. I made sure to take care with polarity, voltage, and uF.
- I did not specifically buy a "filter cap" when I got the 1000uf 250v cap. Could this be an issue?
- I did not replace the 'non-polarized' caps on the neck board. There's 3 of them, they are 250v at 1uF, and I couldn't find those anywhere, so I just skipped them.
- There was one location on the chassis which had a screen-misprint, in which the positive/negative silkscreen was flipped, different on the top of the board and the underside. I matched the original capacitor orientation.
- No obvious leaking or cold/cracked solder on the PCB.
- I did use an air compressor to clean out the dust around the back of the monitor and yoke. Could I have damaged something for a 70 psi short burst of air?
Before I take this to P&L for official repair, Ive considered removing the largest caps, and re-solder in the original filter caps. I would love to hear any other ideas of why I'm getting power, but no picture. Could I have shorted something?
Post recap, the picture was bouncing around like crazy, until I left it on for about 45 seconds, when the picture went black with a very faint, tiny white line at the top of the display. It's sending power to the yoke and it doesn't appear that I shorted the high voltage.
Here's a video of the same signal being sent to two machines, after the cap. Yikes.
https://drive.google.com/file/d/1KZaqdTGcWxvviAG9NSfAKmeBuP-Wi4-V/view?usp=sharing
Here's a video of the monitor powering on and a brief inspection of the cables attached, while I looked for any other pots that might help me adjust the sync issues.
https://drive.google.com/file/d/10wKvXYHUqh0i9ITYFB0X4mzpu2trrKQZ/view?usp=sharing
Attached is a photo of what it looks like now.
The only obvious error I made, was I initially seated the monitor-service/calibration cable into the wrong port. After the screen stopped displaying a picture, I corrected the cable placement, but I no longer got any picture on screen at all.
Some notes:
- I bought my caps at a local electronics shop, and the larger ones I got online from Mouser. I made sure to take care with polarity, voltage, and uF.
- I did not specifically buy a "filter cap" when I got the 1000uf 250v cap. Could this be an issue?
- I did not replace the 'non-polarized' caps on the neck board. There's 3 of them, they are 250v at 1uF, and I couldn't find those anywhere, so I just skipped them.
- There was one location on the chassis which had a screen-misprint, in which the positive/negative silkscreen was flipped, different on the top of the board and the underside. I matched the original capacitor orientation.
- No obvious leaking or cold/cracked solder on the PCB.
- I did use an air compressor to clean out the dust around the back of the monitor and yoke. Could I have damaged something for a 70 psi short burst of air?
Before I take this to P&L for official repair, Ive considered removing the largest caps, and re-solder in the original filter caps. I would love to hear any other ideas of why I'm getting power, but no picture. Could I have shorted something?
