Question about Sony KV-20S40 20" TV

Sony KV 20S40 20" tv flutters, reduces in size and then shuts off

I have this tv about 8 years now. Just recently when I turn the set on it might be Ok for a minute or two and then the picture starts fluttering. It appears it's having trouble maintaining the full image. Then it might go black on the right edge of the screen (1 1/2 inches or so) before it shuts off. The standby light will go and off every few seconds. I'd like to know is this a picture tube problem or a power problem and is this worth repairing? If repairable how much might it cost?

1 Answer

Mike Longo

Level 2:

An expert who has achieved level 2 by getting 100 points

All-Star:

An expert that got 10 achievements.

MVP:

An expert that got 5 achievements.

Vice President:

An expert whose answer got voted for 100 times.
Expert
398 Answers

The set most probably has cracked solder joints in one of the deflection circuits, which is pretty common. The picture tube and major components are fine. A good tech can quickly resolder the main board and that should not cost too much. If your set came into my shop I would charge about $50 but ask around, the shops in your area will vary.

Posted on Jul 31, 2007

Add Your Answer

Upload

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

Loading...

Include an image. It's worth a thousand words.

prev next

Related Questions:

1 Answer

Sony KV-20FS12 shuts off after being turned on, stand by/time light blinks

the blinking is actually an error code. watch the blinking closely and you will see it blink a number of times pause briefly then blink the same number of blinks over and over. If you let me know the number of blinks I can tell you why the set isnt powering up.

Aug 07, 2012 | Sony KV-27V42 27" TV

1 Answer

Sony Wega Kv-36XBR250 screen blinking

I have seen this flashing before, this could be an indication that the picture tube is weak, what happens is that if the white balance is off there is a circuit called akb it monitors the kathode of each gun and if they are not in balance it will attempt to balance it out. if it can't the picture will begin to flash, sometimes in some models the power light will blink 5 times. On some models the power light will only flash if the tv gives up trying to compinsate for white balance and shuts off compeletely. If you see the tv shutting off with 5 blinks then you know for sure it is time for a new set.

Sep 02, 2009 | Sony FD Trinitron WEGA KV-20FS120 20" TV

1 Answer

Have Sony TV, Vega the largest size, recently it started shutting down itself and finally there was a thin line on the screen and not it has completely shut down. The local mechanic says the main IC has...

The vertical IC is gone.

Apr 23, 2009 | Sony FD Trinitron WEGA KV-SW29M50 29" TV

1 Answer

Image too large for the screen

you need to replace filter capacitor from vertical section area and horizontal section area. i already encounter tha kind of problem and fix replacing vertical section capacitor.

Apr 19, 2009 | Sony KV-13M42 13" TV

1 Answer

Sony wega reduced sound

the problem maybe is in the sound IC. try to re solder the sound section of the TV.

Apr 13, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

32 inch sony trinitron wega

It will most probably need an overhual of the power supply

Mar 01, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

1 Answer

Sony KV-27S42

If the screen won't come on then the diagnostic will never show. The 4 blinks is an error code. If the set is older than 12 years then it doesn't owe you anything, you got your money's worth out of it. Average life of any tv from that genre is 8-12 years. It's time for a new set, or take it in for an expensive repair ( pending parts availability).

C-Dog

Feb 10, 2008 | Sony KV-27S42 27" TV

1 Answer

Sony KV-27V66 Tv Problem

I would have someone check the electrolytic capacitors in the power supply or deflection circuits. You can check them with an ESR meter. Any good technician should have one. I bet one or two of the caps are leaky.

Dec 14, 2007 | Sony KV-35S40 TV

1 Answer

Sony Trinitron Kv24Fv12

stand by timer light flashes 7 times no pic no sound. how do i
stop timer

Apr 09, 2007 | Sony FD Trinitron WEGA KV-32FS100 32" TV

1 Answer

Sony Tv kv 2584 A5

There are no adjustments for this problem,if the unit has been working good for 3 years and suddenly gives you this pix is time to call a qualified technician,among many reasons you might have loose solder conections in the horizontal drive circuit or poor regulation problem in the power supply,if you dont know how and where be safe and call a Technician.

Aug 30, 2006 | Sony KV-32S26 32" TV