Maker Pro
Maker Pro

Ticking sound and won't start VCR

erik0607

Feb 1, 2023
7
Joined
Feb 1, 2023
Messages
7
Hi everyone

Recently bought a pretty cool Mitsubishi VCR at auction that won't start.
I've checked all the capacitors I can find without finding a fault. It simply won't start and constantly gives a ticking sound around the area of the photo.

Any suggestions?
Kind regards Erik
 

Attachments

  • 16752468729096424592371632915074.jpg
    16752468729096424592371632915074.jpg
    278.6 KB · Views: 10

Martaine2005

May 12, 2015
4,949
Joined
May 12, 2015
Messages
4,949
Hi Erik, not the best description ‘ticking’!.
A visual inspection of capacitors will only show obvious signs, it won’t show high ESR or shorted caps. Take them out of circuit and use an ESR meter.
Can you elaborate on ‘ticking’?.

Martin
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
'Ticking' is usually indicative of a PSU going into protection mode for one reason or other. The fault may not necessarily lie in the PSU itself (as common as that actually is) so if you can disconnect the PSU board output and the fault (ticking) stops then you will need to fault-find the rest of the machine.
 

erik0607

Feb 1, 2023
7
Joined
Feb 1, 2023
Messages
7
I've discontented the capacitors around the psu and tested them. There are a lot of other capacitors away from the PSU (and sound) but figured those need to be checked (?). I don't have a separate psu board though so not sure how I can disconnect the output
 

erik0607

Feb 1, 2023
7
Joined
Feb 1, 2023
Messages
7
'Ticking' is usually indicative of a PSU going into protection mode for one reason or other. The fault may not necessarily lie in the PSU itself (as common as that actually is) so if you can disconnect the PSU board output and the fault (ticking) stops then you will need to fault-find the rest of the machine.
Hi Erik, not the best description ‘ticking’!.
A visual inspection of capacitors will only show obvious signs, it won’t show high ESR or shorted caps. Take them out of circuit and use an ESR meter.
Can you elaborate on ‘ticking’?.

Martin
See reply above
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
Yes, that's definitely the noise of an overloading (going into self protection) psu.

The fault is most likely on the secondary-side. Check the secondary-side rectifier(s).
 

roughshawd

Jul 13, 2020
465
Joined
Jul 13, 2020
Messages
465
That video was really vaige...
make sure you don't have one of those overloading psu manufacturers in there too!
 

kellys_eye

Jun 25, 2010
6,514
Joined
Jun 25, 2010
Messages
6,514
I've discontented the capacitors around the psu and tested them.
How did you test them? You need an ESR checker to be sure....

not sure how I can disconnect the output
You'll have to trace the pcb tracks and, perhaps, make a deliberate break in the track to isolate the output from the PSU to the remaining circuitry. Post a pic of the underside of the board and a close-up of the secondary side components.
 

erik0607

Feb 1, 2023
7
Joined
Feb 1, 2023
Messages
7
How did you test them? You need an ESR checker to be sure....


You'll have to trace the pcb tracks and, perhaps, make a deliberate break in the track to isolate the output from the PSU to the remaining circuitry. Post a pic of the underside of the board and a close-up of the secondary side components.
Oh I thought you could check and see if the resistance increases consistently. (Like in this video
)

I was able to find a rectifier right next to the power cable input . But are they more than one?
Attached some more pics of front and back side of the board.
Thanks!
 

Attachments

  • 20230202_005106.jpg
    20230202_005106.jpg
    355.8 KB · Views: 2
  • 20230202_005033.jpg
    20230202_005033.jpg
    475 KB · Views: 2

Delta Prime

Jul 29, 2020
1,962
Joined
Jul 29, 2020
Messages
1,962
Model number, serial number VCR please.I will see if I can pull a schematic.
 

Martaine2005

May 12, 2015
4,949
Joined
May 12, 2015
Messages
4,949
No offence to the OP, but do you realise the dangers of mains voltage? Because it doesn’t appear that you do!.
Please be careful poking around.

Martin
 

davenn

Moderator
Sep 5, 2009
14,260
Joined
Sep 5, 2009
Messages
14,260
Oh I thought you could check and see if the resistance increases consistently. (Like in this video

sadly a very poor way of testing cap's ... a proper capacitance meter (some multimeters have capacitance testing capabilities)
 

Delta Prime

Jul 29, 2020
1,962
Joined
Jul 29, 2020
Messages
1,962
Unfortunately I couldn't find a free service manual this one cost five bucks U.S. I hope you're in the UK cuz it won't work in the U.S. If you're in the U.S.guess what it'll make a clicking sound cuz more likely to be plugged into 110VAC @60 Hertz while the UK would be 230VAC@50Herts.
It all depends if you acquired this VHS for a small amount of money then $5 isn't too bad.Guidance is free on this site if you have any questions. The best part if you share the service manual with us,we will all be on the same page (Pun Intended).

1675399834426.jpg
 
Last edited:
Top