Sony SLV-E780 Power Supply Issue – Clicking Sound, Need Help Identifying Faulty Component

[Akuanka]

Hi everyone,

I’m troubleshooting a power supply issue with a Sony SLV-E780 VCR. The device clicks repeatedly but doesn’t power up completely. I’ve already replaced five capacitors, but the problem persists.

Here’s a video link https://photos.app.goo.gl/3Xki6yvCLn67gLX78 showcasing the sound. Based on your experience, could this be due to a transformer, diode, or another component? Any guidance on what to test or replace next would be greatly appreciated.

Thanks in advance for your help!

 

[bertus]

Hello,

The ticking sound may occur due to an overload on the powersupply.
There shoud be someting drawing to much current.
Take a look at the main board and see if there are some tantalium capacitors broken.

Bertus

 

[Akuanka]

Hello,

The ticking sound may occur due to an overload on the powersupply.
There shoud be someting drawing to much current.
Take a look at the main board and see if there are some tantalium capacitors broken.

Bertus

Hi Bertus, thanks for your answer. I have already replaced all electrolytic capacitor and checked good ones. there was no issue with that. How to identify the tantalium caps? Can I check them directly on the board?

 

[bertus]

Hello,

There can be orange or blue droplet capacitors.

Tantalum capacitor - Wikipedia

en.m.wikipedia.org

I have seen then fail and even shorting an 50 ampere powersupply.

Bertus

 

[Akuanka]

Thanks again. Yes, I figured out that but was unable to understand their rating. can I check them directly on the PCB? I have a multimeter in resistance mode and checked with 20k and Million Ohms. They all show OL. Should I solder each one by one? there are also minimal markings that are impossible to read.

 

[bertus]

Hello,

I am not talking about the powersupply itself.
It is likely connected to a board.
There is likely someting wrong with that board.
Something is drawing to much current causing the powersupply to go into protection.
That is the ticking you hear.

Bertus

 

[Akuanka]

Hi, Yes, that is clear but how to find which element is faulty this is the problem for me. I have already replaced all aluminium capacitors. Thos tantalum seem to be little tricky to test. Any ideas how to do it? Or could it be diodes?

 

[Akuanka]

Actually PS is detached from VCR but clicks are still there

 

[Bluejets]

Remove or at least, lift one leg of the cap.
With electros, make sure they are discharged first. A 10r 5 w resistor will suffice. For testing, buy a $30 component tester, best purchase you will ever make for the price.
Use a series lap tester to avoid blowing fuses.

 

[player2move]

I only remember issues with caps, when pulsing often the 2 small ones in primary part of psu.

Did you check the diodes for DC on secondary side for shortage?
And did you try to warm the psu with a hairdryer? Caps get back part of capacity when you heat them up.

As far as I can remember there are far more then 5 caps in your psu. If you want to keep the machine longer, i suggest to renew them all.