Sony SLV-679HF VCR Power Supply and Playback Problem Picture Image suddenly disappear
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- Опубліковано 30 лип 2024
- Previous owner wrongly connected unit to 220V power source and damaged the unit's power supply. After the repair of power supply, the VCR powers on normal. However, during play back, the picture would show very briefly on the screen and disappear. The screen becomes blue. In addition, the timer does not run. The VCR does not stop playing the cassette, only there is not image. Pressing Fast Forward or Rewind in play mode shows the images, but when it stops, the picture stabilizes briefly and disappears again.
- Наука та технологія
Thanks for the video. Excellent demo, but you should use a good mic. I can barely hear your voice ☺
Well done persevering with it.
So many of those machines just get dumped when they go wrong these days.
It is good to keep a VHS going.
I always try to tinker and repair something to avoid throwing it in the trash and add more problems to the world. This VCR went back to its original owner. Many electrical problems could be simply avoided if people bother to verify the specification of their equipment before using it in a different country.
Thanls for sharing.
Hi - Thanks a lot for this video. I just experienced same issue with same VCR SLV-679HF. Video will show for 3 seconds and then no more video. You mentioned replacing Secondary Power Capacitors solved issue for you. I do not have Service manual. could you please let me know which Capacitors you replaced? Thanks
I have an SLV-R5UC that when plugged in shows the display, and it will load tapes and eject them (so servo motors are doing OK) but there is NO POWER at all going to either the video head or capstan. Could this be related to a capacitor problem? I know (from reading on the Net) that the R5UC has a reputation of having a poor PSU and many people replace the original caps. But I don't want to go that route if you think this problem is not related to a capacitor issue. Any help would be appreciated.
Also, as you demonstrate in your excellent videos, fixing one problem many times just then shows where ANOTHER problem is and needs to be addressed. I have no idea if the machine will run if power is supplied to the video head and capstan but obviously those items need to be going for the VCR to work.
Thank you again for any assistance. You have quite a fund of knowledge re these electronic devices and it's truly an education to watch them.
drcoolit Thank you for sharing your kind comment. As for your capstan problem, it is likely the power supply is showing its age, and the filtering of the DC power is not done properly anymore by the aging capacitors. I had the same problem on another Sony SLV-315 model. Here is the original video: ua-cam.com/video/OBPfF1zzP_Y/v-deo.html
After that problem was fixed, I discovered a mechanical issue with the tape loading mechanism, and had to fix it here: ua-cam.com/video/tY4JXp9zbFw/v-deo.html
So the first step is to restore the power supply and then you'll see whether other problems exist. Make sure to take the proper safey precautions before working with any electrical equipment.
1000uf thank you for your advice. I have seen your videos (mentioned in your note) several times as they were highly informative. You do a very good job on these "do it yourself" topics. However, it's only been since yesterday in viewing these PSU videos where capacitors are mentioned QUITE A FEW TIMES as being the culprits for quite a number of problems that the importance of these things has become ingrained in my mind. Now I'm going to have to learn how to solder/de-solder PCB components! Thank you again for your response.
drcoolit You're welcome. You might want to practice on some junk electronics first before attempting to work with soldering. I have two videos in my channel covering soldering and de-soldering. Good luck.
1000uf I am definitely going to view your videos on the soldering techniques! Thank you again.
Hi, do you actually do repairs when I send a Sony VCR to you? Just let me know, thanks!
No, I don't.
this video was quite helpful to me. thank you very much for uploading this video.
i have a Panasonic 3- head superdrive vcr.Everything is working properly. sound works,display also works but there is no picture on the screen. i tried to clean the video head but still there was no picture. is that the same problem ?(regarding the capacitor)
if so...then how do i know that which one of the capacitor is damaged ? please help me.thank you.
+Abdulwasay Fazal Does any capacitor look damage to you (swollen, bulging top, leaking dry or wet content)?
i have to check that yet ....i will certainly informs you if this is the problem😂
I've got an SLV-393 and it has no picture only blue, but the tape is moving. I can feel what feels like 120v ac coming from one of the 4 fucking screws on the side. And there's a plastic piece broken off, no clue where it goes. Nice sale, goodwill. Not worth taking it back for my $6.49 either.
200 Volts? It's far too low for a power supply. So you did it ok :)
+1videoshow The VCR is designed to run on 120V. So often they use 200V to 240V (better) for the main capacitor.