Hi there, I am having an issue with my TV. It has a Scart input on the back which is S-video only, which I've been using for my OG Xbox. Recently this input stopped working. There is sound but no picture at all, as if nothing is connected. This only happened after I tried hooking up a PS3 using an S-video cable to the same input. There was no picture, and thinking it was an issue with the PS3, I plugged the Xbox back in but there was still no picture. I've tried the AV Scart passthrough adapter on the other Scart input with a composite source and it works fine, so I can rule that out.
I'm worried that I may have damaged the input somehow, as even wiggling the connector around makes no difference. The TV in question is a Panasonic TX21MD4. If anyone has any advice on how to fix this it would be much appreciated.
CRT TV Scart input stopped working
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KPackratt2k
- Posts: 271
- Joined: Sun Apr 04, 2021 11:02 pm
- Location: Seattle, WA, USA
Re: CRT TV Scart input stopped working
On most TVs there are zener diodes for overcurrent protection that go between the video signals and ground. If these diodes are shorted, the signal will be grounded out. If you have a multimeter, you should measure the resistance between the video signal pins (15 for Chroma and 20 for Luma) and any one of the ground pins (4, 5, 9, 13, 17, 18, and 21) of the SCART connector. If it reads 0 ohms, then the zener diodes need to be replaced.
If you were hot-plugging (i.e. plugging in the video cable while the console is turned on) your consoles into the TV, it's possible that it caused the zener diodes to short.
If you were hot-plugging (i.e. plugging in the video cable while the console is turned on) your consoles into the TV, it's possible that it caused the zener diodes to short.
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TheGamer123
- Posts: 2
- Joined: Mon Dec 21, 2020 5:13 pm
Re: CRT TV Scart input stopped working
Thanks, I've just tried measuring them but they both give me 75ohms so the resistors seem to be OK.KPackratt2k wrote: ↑Tue Mar 04, 2025 12:15 am On most TVs there are zener diodes for overcurrent protection that go between the video signals and ground. If these diodes are shorted, the signal will be grounded out. If you have a multimeter, you should measure the resistance between the video signal pins (15 for Chroma and 20 for Luma) and any one of the ground pins (4, 5, 9, 13, 17, 18, and 21) of the SCART connector. If it reads 0 ohms, then the zener diodes need to be replaced.
If you were hot-plugging (i.e. plugging in the video cable while the console is turned on) your consoles into the TV, it's possible that it caused the zener diodes to short.