Question about Quasar SP-3235 32" TV

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Vertical Diffusion I am having a problem with one of the TV/VCR Combo sets, it has not diffusion of the picture vertically. I have a lot of experiance in electronics, I will resolder the board. But if this does not work, I would like to know what it is I have to repair and if at all possible what it looks like. Thanks you

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Re: Vertical Diffusion

Completely resolder the virtical circuit, including the vert. ic. i have also at times found an open resistor near the flyback that provides b+ to the vert. ic. if you can find a pinout if the ic, find the b+ pin & trace it back to the fluyback. good luck.

Posted on Dec 18, 2006

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I got the problem for my Panasonic 21 TV (CRT type) where's Vertical line across picture tube when the brighness adjust high. The vertical I.C already changing. Any solution > Thank you

Have you recently replaced its Line Output Transformer [LOT]?. If so have you replaced it with same type and number? Verical bars are due to LOT to Deflection Yoke mismatching. It is known as "Yoke Rigging" technically. Replacing the vertical Ic won't help in this problem . If you have replaced the LOT, the replaced one is not orginal. Ok

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Tv goes to straight line in center of picture then

It happens when Vertical deflection stops as Vertical Out IC becomes hot or does not get vertical signal.
Please check electrolytic capacitors and dry solder joints in vertical out section in TV.

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Just increase the screen voltage slightly by turning the screen control on the LOT and if a horizontal line appears, check the vertical IC supply, and if everything is okay, change the vertical IC, it is not costly.

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If the line goes across the screen you have a loose solder joint on the vertical output IC. I've seen this happen many times in Zeniths and a lot of other sets. If the IC is not loose then there is a loose solder joint somewhere else in the vertical circuit. These IC's are 10 - 13 pin chips that operate the vertical deflection on your set. I feel like a drop of solder in the right place will fix it! Stargazer

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1 Answer

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Does you set have PIP (picture in picture)? If it does then the PIP module has a bunch of capacitors that have gone bad (dried out and leaked) causing you to loose vertical sync. Vertical synchronization is what locks your picture keeping it from rolling. Even if you don't have PIP then still you have a vertical sync problem. The set would have to be checked by a tech to find exactly what's happening. Stargazer

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1 Answer

Picture on Panasonic tv intermittently becomes striated and bottom half of picture shows on top half of screen

Hello! What you're describing sounds like a vertical deflection problem if it also occurs when you're watching a TV program. This type of trouble is a component failing in the vertical circuit of your set. A loose solder connection could cause this. On the other hand, if it just happens when you run the VCR, your problem could be somewhere in the tape drive mechanism or possibly a bad tape. Things like slipping clutches,bad belts sticking guide rollers are a few things that will cause this in a VCR. You need to have a tech check it for you. Hope this gives you some help. Stargazer

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1 Answer

Vertical hold

You dont have enough vertical sweep!! Best thing to check is the vert output device and I think its an IC . BUT before that check the b+ going to that device and see if its low. I will run through a silicon diode right next to the ic. Measure both sides of the diode and if theres a big voltage drop then the diodes bad. Now also these sets are common for the b+ filter cap off thge flyback transformer. Its the voltage line that feeds that diode and the vert output section. Now measure all caps out of cucuit as most will measure good if you dont. Also just for giggles right nrxt to the big IC that has the vert ,horizontal video and sound drive there is if im not mistaking the vert parts start with c4-- or the ic will be ic4-- Its a small cap that will sayc4-- attached to nothing but the ground and one pin of the ic. I've seen this cap cause all sorts of vert problems in the past as its the vert waveshaper capacitor for the vert osc/drive. Good Luck

Apr 17, 2006 | Sharp 25VT-J100 TV

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