JP1 Remotes Forum Index JP1 Remotes


FAQFAQ SearchSearch 7 days of topics7 Days MemberlistMemberlist UsergroupsUsergroups RegisterRegister
ProfileProfile Log in to check your private messagesLog in to check your private messages Log inLog in

VCR won't power up

 
Post new topic   Reply to topic    JP1 Remotes Forum Index -> Electronics Repair
View previous topic :: View next topic  
Author Message
Ellen



Joined: 03 Aug 2003
Posts: 100
Location: East of the Rock, West of the Hard Place

PostPosted: Wed Sep 27, 2006 7:37 pm    Post subject: VCR won't power up Reply with quote

Last night I was moving some of my electronic equipment around to rearrange things because I bought a new DVD recorder. When I came home from work today and went about finishing setting things back up, my VCR would not power on Sad The only thing that I can think that I did that might be a problem is that I forgot to remove the tape that was in the VCR before powering it down. Do you think that might be why it won't power on now? I did open it up and I don't see or smell anything burned. And the fuse appears to be okay. It is a JVC HR-S7200U that I bought maybe 10 years ago. It probably isn't worth the cost of repairing, but I was wondering if there is anything I might try to fix it. Any comments would be appreciated. TIA
Back to top
View user's profile Send private message
zaphod7501



Joined: 02 Aug 2004
Posts: 530
Location: Peoria Illinois

PostPosted: Wed Sep 27, 2006 9:07 pm    Post subject: Reply with quote

You'll have trouble replacing it because all the current VCRs are based on the $8 Chinese junk chassis.

The usual cause of this symptom is due to failure of all (at least deterioration of many) of the capacitors; probably in the power supply. Repair requires educated guessing on which ones to change, usually lots of them.

Short term solution is to plug in and unplug the A/C cord repeatedly until the power supply starts up and the microprocessor resets. If you can get it to turn on, it should keep working until it loses A/C power again.
_________________
Just call me Zaphod (or Steve) --- I never should have started using numbers in a screen name but I just can't stop now.
Back to top
View user's profile Send private message
Ellen



Joined: 03 Aug 2003
Posts: 100
Location: East of the Rock, West of the Hard Place

PostPosted: Sun Oct 01, 2006 8:05 am    Post subject: Reply with quote

I'll give that a try. Thanks Steve.
Back to top
View user's profile Send private message
The Robman
Site Owner


Joined: 01 Aug 2003
Posts: 19066
Location: Chicago, IL

PostPosted: Sun Oct 01, 2006 9:39 am    Post subject: Reply with quote

If you do want to try repairing it, when a capacitor burns out, there's usually some ugly gunk around the base of it. But, some capacitors may be dead without there being any gunk, so it's not a 100% sure fire thing.

If you open it up and you do see some caps with gunk on them, at least you know that that's your problem, but look for other burned out parts also.
_________________
Rob
www.hifi-remote.com
Please don't PM me with remote questions, post them in the forums so all the experts can help!
Back to top
View user's profile Send private message Visit poster's website
remoteneeded



Joined: 27 Dec 2005
Posts: 22
Location: London, UK

PostPosted: Sat Dec 09, 2006 6:03 pm    Post subject: Reply with quote

This post may be too late for you, but I'll post this information to help others.

I agree that's it's probably a faulty electrolytic capacitor in the power supply. Here's two ways of finding the dead capacitor:

1/ The easiest way is to use an ESR meter. The great thing is that you can test the capacitors without having to remove them from the circuit board. I have fixed many dead VCRs using one of these meters.

2/ The hotter a capacitor, the shorter its life will be, so look for capacitors in the PSU that are mounted close to components mounted to heatsinks. Change them for new ones and see what happens

Be wary of using a capacitance meter, as this may not indicate that your cap is faulty - you're looking for capacitors with a high ESR, (equivalent series resistance)
_________________
Andy C / Remoteneeded
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic       JP1 Remotes Forum Index -> Electronics Repair All times are GMT - 5 Hours
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


 

Powered by phpBB © 2001, 2005 phpBB Group
Get Smart! the band's official homepage Rockabilly Central