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Old 03-16-2022, 07:17 PM
BenM86 BenM86 is offline
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Join Date: Mar 2022
Posts: 14
Need help with input and sync issues with JVC AV-27530

Hi all! I’ve been getting into CRT TV’s for my retro gaming addiction, hoping I can get some help learning about these beasts as they’re very different from the electronics I’m used to working on. I’m having trouble diagnosing this JVC I just picked up. I’ve never seen as issue quite like this before and Google is failing me. The TV seems to work just fine, but I can’t get a usable picture from any of the inputs. I’ll attach a video of what it looks like, possible sync issue? The coax input works and looks fine, if I use an RF modulator from a console it’s fine. But every other input, Composite, Component, and SVideo all look like this, I tested all of them from multiple sources. Also the OSD works and looks fine, and looks fine on top of the garbled picture on the inputs.

The seller I bought it from said everything was working when I picked it up he tested that day, I supposed he could have been lying but it was a $20 TV I don’t think he was. So it seems likely this happened on the car ride home, possible a broken solder joint or trace somewhere? The only thing I’ve been able to discern is if I put pressure on the main video chip on the board it will slow down the rolling picture the more pressure I put on it, could the jungle chip have gone bad somehow? I did a full inspection of the board and I don’t see any caps or connections that are obviously bad or leaking. Also sound works on all inputs.

Video: https://youtube.com/shorts/QF07it8c-Zo?feature=share

Thanks!

Last edited by BenM86; 03-18-2022 at 10:08 AM.
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