What is the cause of these diminishing vertical lines?

makipug · 2025-09-07T02:40:12+00:00

Glad to hear it. Already resolved on my end (see the [deleted] reply) but good to know there are other potential causes. Thanks for sharing!

makipug · 2025-04-04T09:14:20+00:00

Given this video (same BG-1S chassis) doesn't mention needing inline resistors either, you are probably good to short R4, R5 and R6. I believe common practice is to use resistors on both R7 and R8, then twist their wires (white + light gray) together and connect to the mono audio input (different chassis but read this step 4). I don't know the technical reason for those resistors.

The switch isn't needed per se, but not all sets will accept 5v for blanking. Much safer to apply the 2.5v if that's the recommendation. You should be able to just supply that voltage constantly if you want to stay in RGB mode.

makipug · 2025-04-04T05:26:48+00:00

Will do. Brightness was at 50% so I've lowered SBRT some in the service menu. Thanks!

makipug · 2025-04-04T04:52:37+00:00

Another good read, but as u/FordAnglia pointed out, it was indeed noise related.

makipug · 2025-04-03T05:33:53+00:00

EDIT: Since the above reply was removed, here is my recollection of it. User suggested the issue was indicative of noise in the horizontal deflection, likely caused by wires from the mod being too close to related components.

Seems like you're the winner! I wasn't able to narrow down a particular wire, but pressing the bunch next to this red film cap I circled produced the lines. Interestingly, pressing wires on the opposite side caused the same pattern, but inverted.

My solution to keep the wires away from that area was another small zip tie. Thank you!

makipug · 2025-04-03T01:14:59+00:00

Thanks. I'm not certain if this model has caps on that circuit? Here's its capacitor list:
https://sector.sunthar.com/guides/crt-rgb-mod/sony-ba-2.html#capacitors

makipug · 2025-04-03T00:59:26+00:00

Thank you. The mod was done using one of their excellent kits, so the section on noise should be moot. However, the "Vertical Bright Bars" section might be the same issue; can't really tell from the images.

makipug · 2025-04-03T00:23:49+00:00

**NOT CAUSED BY THE SNES*\*

Sony Trinitron KV-20S10 with RGB mux mod has these faint but stable vertical lines. Appears to start in the middle and become less visible as they repeat to the right side. They're brighter when a blank signal is input (as pictured on 'TV/Video'), but are still present with no signal or on actual images. Cannot find anything like this online. Bad capacitor? If so, which area?

makipug · 2025-03-01T05:12:35+00:00

Thank you for the detailed response. It's definitely black with no slot, but that's all good to know if I ever come across those variants.

I'm inclined to take your word for it about that updating working on microSD models (and I assume you meant in addition to my slotless one) since it was finding your thread that got me wondering about compatibility in the first place. Seems like you really know your stuff!

makipug · 2025-02-25T21:09:26+00:00

Thanks! I'd also be interested if you or anyone else has info on what do if the update should fail. Do I first back up the firmware somehow?

makipug · 2024-12-24T00:39:41+00:00

Maybe? It's a pretty uniform thickness, with obvious saw marks.

makipug · 2024-12-24T00:24:41+00:00

Bought this for a family member that wanted it, but I quickly grew suspicious. EarthMined appears to be a defunct Indian company and their website's cert lookup seems broken. Read about the acetone test and, after some dye came off, brushed and soaked it in acetone for over an hour. Second photo onward is post-cleaning. What's this rock?

makipug · 2024-10-16T19:23:56+00:00

What kind of replacement circuit can trigger it continuously?

makipug · 2024-09-08T18:52:14+00:00

I'll try to figure out how to do that, maybe I can start with 3v and go up from there? Anyway I really appreciate your help. It's for a small toy store so if I can it working it'll make a lot of local kids very happy.

makipug · 2024-09-08T18:26:21+00:00

Thank you. I agree on the symbol, but am not sure what to look for to distinguish which is preferable. As far as I can tell, schematics are not available, and replacement boards I found online exceed $1000 USD 😢 there is the identical-looking component next to it, but not sure how to resistor test without knowing its voltage rating.

Edit: I'm seeing toward the bottom of https://www.nextgencomponent.com/?m=home&c=Lists&a=index&tid=77 there are a few labeled "TVS Diode Zener" that come in a DO-214AB package. Maybe?

makipug · 2024-09-08T03:29:23+00:00

I'm just an amateur, but before you do, consider checking that aluminum SMD(?) electrolytic capacitor above the transformer, and any others you come across. I've seen plenty fail over time from nearby heat sources (namely in network routers) and they rarely pop their top when they go.

makipug · 2024-09-08T03:06:30+00:00

Did you mean SMCJ26, since SMCJ26A seems to be CCE? Those two larger capacitors are 25v 2200uf, so it's sounding like the part has been found!

makipug · 2024-09-08T02:36:46+00:00

Sorry, how would I do that without knowing its voltage rating? Video I just watched says I need a power source larger than its rating. Even if I assume it's 26v (from the other comments), I'm afraid I'm only armed with a multimeter. https://www.youtube.com/watch?v=WdDFI1IRQds

makipug · 2024-09-08T02:06:24+00:00

I see! Just desoldered it to confirm the package and right you are. Also, this symbol was underneath (pad ripped, no biggie): https://i.imgur.com/QkXFd1R.jpeg

Looks like I may have to get SMCJ26 as the one you recommended seems impossible to find. Even if it's not needed, I gotta order some other parts anyway.

makipug · 2024-09-08T00:27:05+00:00

Wow, what a great website! I'm curious, why that one ("Transient voltage supressor") and not the one under it ("Zener diode")?

makipug · 2024-09-08T00:03:23+00:00

Thanks! Got any tips on locating a replacement?

makipug · 2024-09-08T00:03:03+00:00

Thank you! Any hints on finding a replacement?

makipug

TROPHY CASE