Ok, I know this forum is more about arcade monitors. However, I'm hoping the general knowledge of CRTs may help me out here.
So my old Zenith TV (that I use with my older video game consoles) developed a problem with black horizontal bars. These seem to show up with brighter colors. They do become less visible if I turn down the brightness of the TV with the on-screen menus, but I'm worried that this may be a problem that gets worse.
Here's a video of the problem. Note the black runs on the Sega logo screen (especially that really dark one near the top), and through the middle of the Sonic logo.
The TV is a Zenith SL2067BT, made in 1994. My parents bought it new from the store, but they never used it much. I used it for gaming from 2001 to late 2006 (when I got an HDTV, and didn't yet realize that my older consoles look bad on an HDTV.) Fast forward to this year, when I got the TV from my parents before they threw it out. It had not really been used since 2006.
Besides a lot of non-use, the only other thing in this TVs history is having to be repaired around 2003. It turned off on me in the middle of a game, and could not turn it back on. My father brought it to someone for service, and we got it fixed.
I've heard replacing electrolytic capacitors solve a variety of problems, so I plan to do that. I've already opened the unit, discharged the CRT (I have experience doing that from my arcade cabinet), vacuumed up a thick layer of dust, documented how the wires are hooked up, and removed the boards. Luckily, no sign of a leaking capacitor.
My plan is to document each capacitors values and part number marked on the PCB in a spreadsheet. Then, I'll mark off the top of the capacitor with a small drop of paint or something. Once I get the replacement capacitors, I can just de-solder any capacitor with paint on it (with my desoldering station), and put in the new capacitor. Luckily, the PCB not only lists the component number (i.e. "C10"), but the proper polarity for mounting the new capacitor.
So...anyone see this problem before? Would re-capping fix it, or do I need to do something else? Or is the TV toast and I need to get another one from a yard sale?
Any recommendations on what capacitors to get? I usually just buy whatever from Jameco.com, but if a more expensive brand of capacitor would be better for my TV, I'll consider it.
Also thought about doing an RGB mod while I have it open, but not sure where to start. Never heard of anyone RGB modding a Zenith. I identified a chip LA7672 as a "Color TV Single-Chip Signal Processor", so that might be a "Jungle chip," but I'm not sure. There's another longer chip on the board, but it's protected by a metal shield that's soldered to the PCB and I can't identity it without desoldering the shield. Although if it's too complicated or I have a high chance of damaging my TV, I'll just stick to changing out the capacitors. Or would it be worth it to ask the folks at the shmups forums?
Attached pics:
1.) The TV in question, prior to disassembly.
2.) The back taken off. The dust buildup is thick.
3.) The mysterious shielded chip.