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Sony crt tv 29" PINCUSHION PROBLEM

I have troubleshooting sony tv 29 inches having pincushion problem at the right side of picture. At first time it was turn on it is small dark and then dissappar in a few second and it will comeback again.


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MY SONY DOES NOT DISPLAY NUMBERS ,VOLUME,MENU PANAL

Posted on Oct 22, 2010

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Do you have Inotech color tv schematic diagram model no it-29?


I need 29" inotech crt tv schematic diagram(it -29).I need to replace a burned resistor but can not see the value.It's causing pincushion destortion on picture.

Aug 17, 2014 | Televison & Video

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Pin problems


I assume that the pincushion problem to your TV, ie, the display have curved vertical lines [X] shape. If so, the pincushion circuit should be troubleshooted. Check the transistor of this stage. Try to download the repair manual to this set. It will have all details. Is it a Sony TV? If so, try this link. http://electronicshelponline.blogspot.com/Pull up older posts.

Dec 26, 2013 | Televison & Video

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I have LG 29 Inch CRT TV Model RT-29FC85VE. It's 5 years Old. Now it's giving Vertical Pincushion Problem. Please help in solving the problem.


please take out the coil connecting the yoke o/p to ground
& rewind it with same gauge copper wire & then adjust the screen by remote code...pressing ok on remote& ok on the tv simultaniously

Feb 23, 2011 | Televison & Video

1 Answer

Occasionally the picture snaps into what looks like a pincushion.


it is infact pincushioning.. these tv's have a maze of boards.. try to contact manufactuer about pincushion pcb also try to auto converge colours if you can.

Dec 14, 2009 | Mitsubishi WS-55807 TV

1 Answer

I need to find the pincushion circuit on my RCA F32632SB TV to check a problem with the TV displaying an hour glass picture. Where can I find a picture of this or a manual to guide me to the circuit?


The pincushion it intimately related to the horizontal circuits,the electron beam must travel farther to reach the corners of the crt and it does to the middle and so without pincushion circuits the raster would be bowed in on the sides on crts 27 inches are larger.Pincushion corrections straightens the raster by modulating the horizontal yoke current at a vertical rate.In an RCA tv the pincushion circuits are usually numbered 4800and the pin amp will probably be numbered 4801,its drive transistor should be Q4802,R4802 will be the width control,and R4805 the e/w pin amplitude. its inputs from the vertical should be Q4801 (subtractor) Q4803 (buffer) you should have a parabola waveform at 4801,yoke current can be modulated here without effecting high voltage.when Q4802 conducts voltage should decrease across Q4801 and the voltage drop across the yoke increases. The east west pin amp control 4805 controls how much of the vertical parabola is input to U4801 to compensate for changes in width caused by variations in beam current.By varying the e/w control resistor you can know if the circuit fault is in the input or output,if the picture varies in size the fault is in the input to U4801,if it does not vary check the output or U4801......hope that helps

Jan 15, 2009 | RCA F32632SB 32" TV

1 Answer

Apex PF3230 TV with pincushion problem.


too dangerous for a home repair as this requires replacement high voltage components and adjusting the set with the back off while running.
Take to repair store.

Nov 08, 2007 | Apex Digital PF3230 32" TV

1 Answer

Is there an adjustment for pincushion?


CHECK THE CAPACITOR IN THE PINCUSHION SECTION OF THE TV MAIN BOARD

Oct 25, 2007 | Televison & Video

1 Answer

RZ56Z83


The picture on my projection TV has intermittent concave right and left sides. Can you tell me what's wrong with it? your problem is due to pincushion ckt as it is intermittent so that there might loose contact or print break in pincushion ckt it can be rectified easily by skilled tech. there is no parts failure. good luck

Sep 23, 2007 | Zenith Z56Z83R/D TV

1 Answer

Shrinked picture of 29 inch television.


It is a pincushion problem. There is a bad cap and or a bad diode in the horzontal section.

Oct 29, 2006 | Toshiba 27A51 27" TV

1 Answer

Pincushion Picture


Lets try something before you call for a second opinion,with the tv ON and the problem showing hit the top and side of the tv,if the picture somehow reacts or corrects itself when you hit it call someone else and tell them what the problem is and that you feel it has a loose conection,dont have to tell them about the first estimate. Dont hit the tv with a hammer,just with the palm of your hand.Is worth the try. Good luck.

Sep 18, 2006 | Sony KV-29FX66 29" TV

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