![]() I took snapshots of waves 4 (H DY H) and 5 (H DY C). So I figured I'd start at the yoke and work my way back. They have some sample waves for the deflection (D) board shown on page 27 in the service manual. ![]() Using your advice, I checked the wave forms at the horizontal yoke. I've taken several measurements, but never quite knew what I was looking for or at, so never got far. I do know very basic electrical theory and what not to do/touch in a CRT. Here is a link to the service manual: Again, sorry if this isn't something normally worked on here. So, I have to try and get most from the component side. It hangs vertically on the side, so its pretty much impossible to run the board without being attached to the cage. It's mounted to a metal cage that covers up the bulk of the solder side of the board. ![]() The deflection board can be a bit of a challenge to try and get some readings off of it. ![]() So the more explicit the directions, the better. But I'm not great with using a scope, and as I mentioned, not good at trying to figure out what to look at on a CRT. I have a Rigol 1054z and can post screen caps. I'm looking for someone to help guide me to find the defective part. So my money is on a common issue with this design The million dollar question though, is what? This is about as far as my CRT troubleshooting knowledge goes. And according to the service manual for that monitor, the deflection board is about 99% identical to mine. Someone else found an eBay listing of a Sun monitor with a Sony chassis exhibiting the same thing. Its possible whatever this is, is a defect across all similar Sony chassis. Its always the static plateau, valley, plateau, valley while adjusting it. I did notice that the ripples running up and down the left and right sides of the screen change slightly if you mess with the geometry settings. To be safe, I reflowed a bunch of joints on the board, focusing on anything attached to a heatsink. I looked over the deflection board for any broken/cracked solder joints, I couldn't find any. After each board, I reinstalled it and checked the monitor. Board by board I recapped the entire monitor (except the H board with the user controls on the front). Unfortunately, I have found that not to be the case. And it was most likely a bad electrolytic cap. So I put it back in the chassis, and the readings look very good while the board is in the chassis: -15v rail (measured -14.5v) +15 rail (measured 14.5v) +80 rail (measured 78.2v) +200 rail (measured 199.3v) I showed the picture to a few people, and pretty much people either said it was the deflection board or the power board. I was getting some inaccurate voltages, and I had to trick it into powering up due to the standby mode. However, I found the board does not like being run outside the chassis for some reason. First thing I did was pull the power board and try to bench test it. So Self repair seems to be my only option. I tried to find anyone local who still works on these, and couldn't. The OSD with nothing connected is also distorted, so it's not the PC or the input. ![]() I powered it up one day, and was greeted to a rather distorted image. I have nice 21" Sony Trintron CRT that I keep around for a specific use, and a while back it started failing on me. Not sure if this is something you guys usually discuss/troubleshoot here, but I'm running out of options. ![]()
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