CurtPalme.com Home Theater Forum

JustGreg · Joined: 07 Mar 2006 Posts: 3098 Location: Kenosha, WI

I just replaced a gaggle of caps on a friends (The Smoker) Toshiba 50H82 which restored the TV to functionality BUT, when the set is first powered on, and for the first roughly 5 minutes the video has (as he told me on the phone) video 'squigglies' and there is a hiss emitted from the speakers.

I heard it when I first fired up the set after working on it the other day but there was no source connected so I couldn't see any video abberations. When I changed inputs to his HDSTB the hiss went away. Evidently it wasn't a bad input port like I thought. He never used that input anyway so I figured no biggie. I guess it was just coincidental timing on my part.

He said the video and audio straighten out after ~5 minutes, with a watchable image, but the only workaround he found for the audio issue is to switch over to external output (AVR) with the remote. Then it's fine but still has the image distortion. But for the audio issue I would guess the problem was HV related. There is one large cap in the power section that is visibly shot. I didn't have one to put in at the time. (He's ordering it). C884, 160v, 330uf M 3D. I have NO idea what the M 3D denotes. I couldn't find an explanation in the service manual.

It sure sounds like HV to me. I noticed the lead had been torn out of the focus block and someone just stripped the wire back and shoved it down in without even tinning the wire. I can't see how the f-block can be opened to resolder the wire. The cover is glued on and slides toward the PCB; which would require desoldering the whole thing to open it up. I think it's called a focus block. It sits next to the flyback and is fed by an anode lead from the flyback.

He isn't worried about it and is thanful for getting his TV working; especially because money is tight due to the medical costs for their handicapped toddler. However it DOES bug Me and I can't let it go. If it's an HV issue I don't want it to eventually arc/fail and take out components that would render the set trash. I suspect the problem will go away after I replace C884...I hope anyway.

Thanks for any direction you can offer guys. Their little girl is a brave little cutie who has had nothing but one surgery after another since born and gets around with a prosthetic leg but other than that loves to watch TV in the livingroom where other people normally are. They have other sets but the Tosh is the biggest.

A side note, she just got selected to be the official Shriners child for a couple years and will be traveling a bit and her photo will be on their literature. Thumbs Up

EDIT: The tubes are pretty toasty too. The set has been used primarily over the years for 4:3..you know what it looks like now that I've corrected the AR to what the set was designed for; 16:9. Anybody know a good clearinghouse for NOS tubes? The set takes Hitachi tube P/N's: Red:23008174, Green:23008175, and Blue:23008176. I'll start searching too.
EDIT: I found a seller on ebay that has the blue up for auction at $74 and some change. He rates them a 9/10...yeah right. I sent a question asking if he has all three and made an offer if he does.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Those tube numbers are Toshiba. Is there a Hitachi number on the tube decal?

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Oh, you may want to listen near the focus pack for the noise. If it is there then with the tv unplugged try turning the screen and focus controls back and forth to swipe the contacts inside clean.