Question about Sanyo HT30744 TV

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On and off picture and color weak Sanyo HT30744

My Sanyo HT30744 has always had a slow start up before picture came on. Now, the power light comes on,warms up, has sound but no picture. For a couple of minutes or so the picture flickers on then off about 3-4 minutes with sound working until it appears to be working with a stabile picture screen. Picture color seems weak however. There has been no adjustment with the color controls. Sometimes a bright color picture other times weak colors. Once the picture stabilizes and stays on it sometimes flickers throughout the day but very briefly. TV in on almost constantly daily 15-20 hours.

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  • Anonymous Mar 28, 2008

    tv blinks (off and on)...all other operations are perfect tv is in shop but technition cannot get schematic from Sanyo. no tv is a good deal if you can't get it fixed.

  • seedz2 Aug 08, 2008

    Same Problem, sound, but no picture. Picture comes on randomly for a few minutes, then goes black again. I have had it for about 4 years. Is there any fix, or am I just out of luck? Thanks.

  • dmrotek Aug 29, 2008

    I have the same problem with my TV.  The picture has now completely gone while I still have sound.


    Dale

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I'll weigh in here with my problem and how I fixed it. My Sanyo HT30744 had a fluctuating picture. In random order, it would go from bright red to bright green, then sometimes the picture would be very weak and fuzzy/unclear. Sometimes after an hour or so, the picture would become perfectly clear again. Over time the TV got worse, until it almost never became clear again. We only turned it on to listen to the news on occasion. Eventually I decided to take it apart and see if there was anything obviously wrong with it. When I opened it up, the first thing I noticed was how dusty it was. From previous problems with my computer, I remembered that just blowing off the dust (or carefully vacuuming it off) would fix the computer display/operation. So I tried it with this TV.......and now it works perfectly fine. My theory is this: with circuit boards being manufactured with circuits placed so close together, it's just a matter of time before dust begins to accumulate and eventually creates a "bridge" or short across nearby circuits. Essentially the accumulated dust (regardless of how poor of a conductor it may be) provides enough of a connection across the wrong circuits that it disrupts the operation. I have vacuumed out my computer motherboard, power supply, etc numerous times when it starts acting up and it has never failed to fix the problem. So I tried it with this TV and that did the trick too! It's easy to remove the black cover behind the screen. It's just 8 or 10 screws (don't forget the 2 little screws around the cable/coax input). Then carefully slide back the cover. Once you pull it back far enough you can disconnect anything that is tied to it (there wasn't anything on mine except for a zip tie holding a cable), then move it out of the way. Then you can slide out the bottom circuit board so you can clean it. It's very easy to do, just be careful, gentle and be sure to ground yourself before touching any circuits. If you live in a dusty environment or notice a lot of dust building up around the air vents on the black cover, this could be your problem. You really don't have much to lose. You just might fix it for no cost! Good luck!

Posted on Feb 12, 2011

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I had the same problem with my refurbished HT-30744 model and my mom's HT-32744 model. It was either try to fix it or buy a new one, so I figred had nothing to lose.

I removed the back cover, unseated the picture tube driver board from the neck of the picture tube (it just pulls off), put on a dab of di-electric grease on the connector on the card, reseated the card, removed and re-applied more grease, reseated the card and the picture has like new for 2 weeks now!

This was a very easy fix.

Posted on Mar 04, 2010

  • Anthony Butcher Mar 05, 2010

    I too had the same problem where my HT30744 TV would lose its color. My mom's HT32744 would have the same problem too. They both are refurbished models bought at Value City Dept store. If I gave the cabinet a good hit it would mostly fix the color, but it could also make the picture go fuzzy too, a clear sign of just a loose connection somewhere.



    So after my wife telling me she was sick of this almost 2 year problem and she was going to buy a new TV on the weekend, I figured I had nothing to lose. So I took the rear cabinet off, unseated the card mounted on the picture tube, applied a little dielectric grease on the connector on the card and reseated the card, removed, re-greased and reattached the card. I have had no problem with either my or mom's which I did the same to since! This is an easy fix that anyone can do. The hardest part is moving the TV and reassembling the rear cabinet. Do not pull the cabinet back out more than you have to, to ease the reassembly of it.

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I agree with henlopen. Also you could have a loose filiament connection on you picture tube. Also any connection on the picture tube driver board mounted on the neck of the picture tube. AN LCD tv would be a good idea since you watch yours so much. Stargazer

Posted on Jan 28, 2007

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It sounds like you may have a voltage regulator problem on top of a weak picture tube. For a set that is to be played as much as yours, I would replace it with a LCD model made by Toshiba, JVC or Samsung. My own experience in the field suggests that these are the most "hardy" of the crop of sets now out there today. I would stay far, far away from the Philips, Vizio, Westinghouse, and Zenith sets.

Posted on Jan 27, 2007

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