Grundig GV-250 Repair problem. (Video inside post)

[hugocarmo]

Hi everyone.
I have the following problem.
I have a Grundig GV-250 VCR which has not been used for over 10 years. When I turned it on, the fuse of the PSU burned out, after being replaced it burned again, I ended up verifying that I had the bridge rectifier and the mosfet in short, I ended up replacing it, and I replaced all the electrolytics of the PSU. However, it started to behave strangely, as I will show you in the video that I will attach as a link.
In short, I ended up replacing all the ICs on the power supply CNY17G, TDA4605, TL431, TDA8137, TL082CP, AN3824K, L2720, this on the upper part of the power supply board. On the soldering part, I replaced the bas20 switching diode.
Always with the same result. I ended up disassembling the video head and removing the plate that is soldered to the motor, then I replaced all the electrolytics, and IC AN3814K. Same result.
I don't know what to do anymore, can someone help me?
I also enclose the Service Manual for this model.
P.S.- At the end of the video, as you can see, the video recorder is working normally.

Video Link:

https://vimeo.com/790579424

Service Manual Link:

https://drive.google.com/file/d/17es...usp=share_link


Thanks in advance,

Compliments,

Hugo do Carmo.

[hugocarmo]

Hi!!
Just fixed the problem!
It was a bad TDA4605, the one I replaced was new but not good, don´t know why.
Replaced it and now everything working as expected.
I want to thank You all anyway.

Best regards,

Hugo.

[ChrisW6ATV]

Good work, and welcome to Videokarma.

Finding a new but bad part can be a big challenge, it is not expected.