Question about Standard (CRT) Televisions

Open Question

Sony tv kv25gxr1/shutdown after few minutes

Sir i would like to ask to how to fix this problem? before this tv is deadset and then i replace the ic voltage regulator the power is now is working and normal but when i turn on the tv after few mins goes off. i already check the voltage if normal and i found it is normal.sir give me some solution to this problem. thank you

Posted by on

6 Suggested Answers

  • 398 Answers

SOURCE: Sony KV-32S40

When the horizontal output (2SC4927) is shorted it means one of 2 things is wrong - the horizontal drive transformer has cracked solder joints or the flyback transformer is shorted inside. If the solder joints on the horizontal drive transformer (the small grey transformer connected to the base of the horizontal output transistor) are cracked then the set will play for a little while and then the parts you just replaced will again be destroyed. ALWAYS resolder the driver transformer when replacing the parts you mentioned! When I replace the parts you mention and I do not see any obvious cracks on the driver transformer then I unsolder the B+ pin of the flyback (labeled 135, for 135 volts) and put a 60 to 100 watt lightbulb (drop-light) in series with the flyback. This means that the 135 volts B+ goes through the lightbulb and then into the flyback, so the lightbulb acts as a current limiter to protect the horizontal output. When you turn the set on the bulb should glow no more than about half bright and you should hear the high voltage come up, but you should not see a picture. If you turn the set on and the bulb glows as bright as if it was plugged into the wall then you can bet that flyback is shorted and must be replaced.

Posted on Jul 13, 2007

  • 556 Answers


it was not necessry to replace so many parts if you go as per proper procedure.please proceed as 1 isolate horizontal output section from power supply & make power supply ok. 2 if it becomes ok check hor osc,driver&h/output section. 3 if it is ok connect power input to hor.section which was isolated. 4 check for loose contact or print. 5 put on tv .

Posted on Sep 22, 2007

  • 1139 Answers

SOURCE: Philips 21" L01.2A Chassis HV Shutdown

Hello bashlort, The increase in voltage may be to some circuit loading being removed this is a sign that something may have increased in resistance or something may have opened in the attached circuit. Have you taken any voltage measurements in the video section of the set, if not check the voltages on the pins of the video processor IC and follow the connections up to the CRT socket, be sure to pay special attention to the focus and screen grid voltages. If those are ok check the voltages in the horizontal section including oscilloscope measurements for drive signals. Please inform me of your findings. Thank you, Shuttle83

Posted on Oct 07, 2007

  • 1 Answer

SOURCE: Sony Wega Blinking Standby Light

No... we got it to come back on and now we havent tuned it off since... we just leave it on 24 hours a day!

Posted on Jan 06, 2008

  • 203 Answers

SOURCE: main power supply

If you changed the regulator and it still doesn't put out B+ you must have an open circuit somewhere. That model is known to have a 6.3 amp B+ fuse that opens and you must check it with an ohmmeter to tell if it's bad. replace it with a 7 amp fuse and you should be ok. If that doesn't solve it you may consider taking it to a shop. By the way, you're welcome for the tip. Two out of a hundred people said thanks for my time. Russmann

Posted on Dec 08, 2008

  • 790 Answers

SOURCE: sony trinitron power will not come on sometimes


Can you give to me your diagnose test result..


Posted on Mar 06, 2009

Add Your Answer

Uploading: 0%


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



Related Questions:

1 Answer

Sir.3#lang sa gitna sa ibabaw nito paliit na horizontal sana matulungan po ninyo ako

You will need to resolder the vertical IC and replace three capacitors that are near or next to the vertical IC. This will restore you television. If you must do the repair I suggest having someone replace the starting capacitor or capacitors in the the horizontal deflection section of the TV as well. The values in the deflection may be 160 or 200 volts at 1Mf and 160 volts at 4.7 Mf. You will correct two problems in one repair. Your TV will last a few more years. Thanks for asking!

Nov 28, 2010 | Sanyo DS31590 31" TV

2 Answers


horizontal IC problem
just replace it sir

Apr 21, 2008 | Sony FD Trinitron WEGA KV-32FQ70 32" TV

1 Answer

My Sony KP-53HS10 was working perfectly fine last night. This morning we turned the TV on and it has a red, blue, and green, 3d effect. Could this be a loose color convergence chip? If so how do I fix it?

You do need a convergence board reworked. In some cases you may repair this at home. Generally the ICs you are looking for will have a 392 **** number. You will have to replace these. And any resistors you see standing tall on the board next to these ICs should be checked and replaced as necessary. The resistors will be about one watt and under 10 ohms. Checkout the website and see if they have something to work with. Thanks for asking and give me a few hands please!

Sep 01, 2010 | Sony KP-53HS10 TV

1 Answer

No power up light blinks 7 times

this is a high voltage shutdown.......the high voltage has exceeded 33k, causes the unit to shutdown for safety.check the power regulation as well as horizontal circuits.hope this helps

Feb 18, 2010 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

Dear sir have sony tv dr 29m93 and and have verticle sinc problem and menu displey not showing can u guid me for this problem

take the tv to a repair shop, a verticle problem is not a major one. verticle has a ic, a output capacitor electrolitic which can dry up, and a scan coil on the tube. on the scan coil we have 4 wires two wires go to a line trasfirmer for horizontal, and two to an ic via a capacitor and ground.
ask the tech check what i have told you.

Jan 05, 2010 | Sony KV-DR29M69 29" TV

1 Answer

Sony trinitron power will not come on sometimes


Can you give to me your diagnose test result..


Mar 06, 2009 | Sony FD Trinitron WEGA KV-34HS420 34" TV

1 Answer

After a few minutes picture shrinks to single line on screen and then powers off

Since the set works initially, there are likely poor solder connections at the vertical IC. If this is not addressed soon, the IC will fail and need to be replaced. The vertical IC is a small flat IC with about 11 pins or so that may be marked LA7837 or something similar. Try resoldering the pins first. If that fails to resolve the problem, replace teh IC. Feel free to post the marking here so I can verify you have the correct one.


Jul 30, 2008 | Sony FD Trinitron WEGA KV-32FS120 32" TV

5 Answers

Sony KV 32HS500

what is the blinking pattern? blink pause blink

Jan 14, 2008 | Sony FD Trinitron WEGA KV-32HS500 32" TV

1 Answer


Have The LED blinking ?! how times ?....some problem can solved by the blinking LED...



Aug 30, 2007 | Sony FD Trinitron WEGA KV-27FS100 27" TV

1 Answer

ABL protection active & color's spots

Replace the capacitor and the resistor as well as the diode that feeds the b+ to the vertical IC.

Sep 28, 2006 | Sony KV-32V26 32" TV

Not finding what you are looking for?
Standard (CRT) Televisions Logo

Related Topics:

54 people viewed this question

Ask a Question

Usually answered in minutes!

Top Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

68368 Answers

matt martin
matt martin

Level 3 Expert

1191 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

Are you a Standard (CRT) Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides