Question about Sharp 27N-S100 27" TV

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Sharp 27" tv

Have a problem with the vertical, after set is on for awhile, picture shrinks top & bottom, suspect a cap in the vertical ckt. not sure which one, any help would be appreciated.

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Re: sharp 27" tv

ALways check for connections. Caps usally get better with heat not worse, but maybe. with out the resources of a service center id say if you suspect a cap change them all i would guess though more likely the IC or a connection becaues you say it is good cold and bad hot

Posted on Apr 23, 2007

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Pictures shrinks.. Panasonic TC-20LM Television

Shrinking picture is a voltage regulation problem in the switch mode power supply, Possibly a cap used in the feedback circuit. Or an over current condition on the B+. This is a very tech intense repair because there is no magic bullet. If it is shrinking on bright scenes then you can bet it is a regulation problem, bright scenes draw more current from the power supply causing this effect. I would not suspect the horiz output because the regulation for this circuit usually comes from the main switch mode power supply. One diagnostic is to monitor the B+ going to the horizontal output and see if it fluctuates. If so you can bet it is a cap or optical coupler in the switch mode circuit.

Oct 10, 2009 | Panasonic Standard (CRT) Televisions

2 Answers

Generic problem for all Standard Televisions

your problem is from east west ckt . there is a transformer used in this ckt which Dry solder and works inttermittent ( shrinks & expend ) . resolder this transformer . iam working with philips ......... enjoy

Sep 21, 2009 | Standard (CRT) Televisions

1 Answer

27" proscan tv

This is a sign that there are either bad caps in the vertical circuit or bad connections at the vertical IC. CAn you solder? If so, resolder the pins on the vertical IC first and post the results here. The vertical IC will be a small flat IC attached to a heatsink with about 9-11 pins. It may be marked LA7837 or something similar.

Keep us posted.

Sep 24, 2008 | Proscan PS36123 TV

1 Answer

Panasonic 27


Initially I would suspect a problem in the Vertical section of the TV. This could either be the capacitor or the IC itself. In some instances, there are no component failures but rather cold solder joints.

Based on your post/description of :...Once in awhile picture returns to normal...", I am more inclined to think that it is a case of cold solder. which can easily be corrected by reapplying heat on the IC pins or the other associated/nearby components with the use of a soldering iron. Care must be exercised since TV units still pack high voltages even when off and unplug.

Hope this be of help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Feb 04, 2008 | Standard (CRT) Televisions

1 Answer

Shrinking screen.

hi there, you do have a vertical section problem and at the power supply section problem. do some test, check for some cold solder at the power supply section, test some electrolytic capacitor at the vertical section. ty

Jan 01, 2008 | Standard (CRT) Televisions

2 Answers

Can only see half the picture

Locate Vertical Output device--replace w/OEM equiv.or better.

Oct 10, 2007 | RCA TruFlat 27F520T 27" TV

1 Answer

Sharp 27G-S60

it is cery simple as it folds after an hoyr or so. as you are asking for the section where the problem is located so is in horizontal oscilattor section.(possible cause cap.might be defective.) as per ckt diagram is concerned is concern please seeweb site hope this will help

Sep 30, 2007 | Sharp 27C-240 27" TV

1 Answer

JVC AV-27790 - single horizontal line

Since Intermitant always inspect the vert ckt for bad solder connections. If not replace the output IC they're cheap and most likely the problem If you still have lines on the top or bottom I would replace all of the electrolytic capacitors in the vert ckt also. Without much test equipment rebuilding the whole little ckt is the best way to go.

Apr 24, 2007 | JVC AV-27790 27" TV

1 Answer

Picture is shrinking from the bottom

Hi you have lose solder in yor vertical section have a tech resolder it or that problem will cost you .hope you have already have it remedied.

Nov 14, 2006 | Toshiba 36A40 36" TV

1 Answer

Shrinking picture

All symptoms indicate a problem in the vertical circuit,the first thing to look for will be loose conection on the vertical output IC,sometimes this IC goes bad completly and it needs to be replaced.If you are familiar with soldering electronics you can take care of it but if you are not too familiar you can play it safe and take it to a servicer ,it will be a lot less expensive than if they come to your house.Let Us know how it goes or if you need more information.

Oct 26, 2006 | Quasar SP-2722 27" TV

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