Quantcast AG-1980P plays audio fine, but the video is shot - digitalFAQ Forum
  #1  
06-26-2012, 02:26 AM
via Email or PM via Email or PM is offline
Free Member
 
Join Date: Dec 2011
Posts: 167
Thanked 0 Times in 0 Posts
Lordsmurf,

I'm new to the forum...

You seem to know a bit about the AG-1980P. I just bought several of them in a package deal and they all have the same problem. They all play audio fine, but the video is shot. They have blue and red banding over the entire picture. They also won't show any video unless the TBC is switched on. I've cleaned all the machines and used different tapes with the same results. One of the machines made it to fairly clean black and white video with hints of color with TBC off. When I went to check it again a couple of days later it was back to the red and blue streaking.

I read up on the capacitor plague and opened up one of the machines. I couldn't find a visibly "bad cap" to save my life. I used the service manual to dismantle the machine. One of the things I noticed is that the machine didn't have a Video Control C.B.A. on the underside of the chassis. I was concerned that someone had removed the card, but I noticed that the screw posts were clean (never had a screw in them) and there was no evidence that there had ever been a card there. There were no empty sockets on the other boards or disconnected wires. I checked the other machines, and none of them have this card. Did they revise the machine over time and integrate the video control function into the other cards without changing the tooling for the chassis to get rid of the mount for the card?

Do you have any recommendations for how I can bring the video back on these machines? BTW they were from a production studio so I'm sure they were rode hard and put away wet.

Thank you,
John
NonsuchVideo


This question was asked in a private message. Rather than hide our tech advice in private conversations, Site Staff will often answer PMs (from any site) here in the digitalFAQ.com forum, so that others may read and benefit from our expertise. Please continue the conversation here. Either login or join as a Free Member, and we can continue troubleshooting your video, photo or web related issue. Thanks for understanding our tech Q&A policies.

Reply With Quote
Someday, 12:01 PM
admin's Avatar
Ads / Sponsors
 
Join Date: ∞
Posts: 42
Thanks: ∞
Thanked 42 Times in 42 Posts
  #2  
06-26-2012, 02:32 AM
lordsmurf's Avatar
lordsmurf lordsmurf is offline
Site Staff | Video
 
Join Date: Dec 2002
Posts: 8,266
Thanked 1,368 Times in 1,204 Posts
I don't have access to an AG-1980P right now to check on the Video Control C.B.A. Mine is being repaired, too.

The machine was revised multiple times through the years, and there are several sub-models for sure.

Capacitors don't always bulge or leak -- sometimes they just dry up. In the case of the JVC DVD recorders, Panasonic DVD recorders, AMD motherboards, etc, it was cheap Chinese knock-off capacitors that bulged and leaked, and that was easy to see. In the case of the 1980 VCRs, the capacitors dry up or drift out of proper value, so there's nothing to see.

You'll need to test each capacitor. I don't have the tools, knowledge or experience to do this, therefore everything is sent to a shop that does have expertise at it. And specifically a trust shop that also knows the AG-1980P quite well.

That shop is Jots Electronics in Arlington, Texas. If you're close, drive there. If you're not close, mail it there. It may run $200 total to fix them, but it's worth it. A restored unit should last many years.

- Did my advice help you? Then become a Premium Member and support this site.
- Find television shows, cartoons, DVDs and Blu-ray releases at the TVPast forums.
Reply With Quote
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
One VCR plays at wrong speed, other VCR plays for half second then stops Member-X Capture, Record, Transfer 5 02-12-2012 12:54 PM
Rotating a video that was shot vertically ? Sossity Edit Video, Audio 6 12-22-2010 07:53 AM
Video plays two clips intermittently naga Capture, Record, Transfer 1 07-07-2008 09:49 AM
PowerDVD has no audio, but plays the movie video okay ? manthing Videography: Cameras, TVs and Players 5 06-23-2006 04:57 AM
Fine tuning cable TV reception mlaviolette Videography: Cameras, TVs and Players 5 09-09-2004 10:00 PM

Thread Tools



 
All times are GMT -5. The time now is 05:48 PM