Question about Proton MM2701VT 27" TV

1 Answer

SHORTED OUTPUT MAGNAVOX TV

I have a magnavox MS3252S431 tv with a shorted output.It was whining before i desoldered the output.The output and driver coil solder looked ok.Do i need to change any other component before i replace the output and turn the set on?

Posted by on

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Genius:

    An expert who has answered 1,000 questions.

  • Master
  • 1,139 Answers

Hello valexandrur,

You are in the correct section, now your problem may be a shorted Integrated High Voltage Transformer (IHVT) also called a Fly-back Transformer and or a shorted Horizontal Output Transistor (HOT). I would first check the Transistor to see if it is shorted between the emitter and collector (to do this use a multimeter set to "Rx1") and the reading between the emitter and collector should be near infinite no reading, if the reading is 000 ohms then the transistor is shorted and should be replaced. Now for the hard part, you technically can not check for shorted transformer turns in the IHVT using a multimeter, you will have to use a device which will allow you to do what is called a ring test. If you do not have this piece of equipment (IHVT tester), I would replace the IHVT just as a matter of good measure, since the HOT had drawn a lot of current I would assume that the IHVT was damaged to since it is in the serial path between the collector of the transistor and the VCC supply.

I hope this helps,

Thank you,

Shuttle83

llc
.com/">http://www.electron-age-technologies-llc.com

Posted on Jan 19, 2009

Add Your Answer

Uploading: 0%

my-video-file.mp4

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

×

Loading...
Loading...

Related Questions:

1 Answer

I have a Magnavox Philips TV model no MS3252S431..I can't figure out how to turn off the closed caption. The remote CC button does nothing... Help


Check the remote control for its infra-red emission. Check it with fresh batteries. Check by pressing all the buttons on it; and see whether all of it generates infrared signal while pressing. If it is found OK, check and replace the infrared sensor inside the TV. If you wish to get some details; check the site linked here. It has details about how to check a remote control; by one among the post. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ If the remote control is found OK; check and replace the infra-red sensor inside the TV. Contact any service technician.

Nov 30, 2014 | Standard (CRT) Televisions

1 Answer

No power ticking sound when plug into outlet


Hello

Your Philips Tvs line output section has some trouble with it. All philips power supply circuits are so designed that, even a small short circuit in the ciruit board occurs, the power regulator will sense it, and the entire system will shut down, and that is happening now in your TV.

You just start with the horizontal output transistor, fitted very close to Line Output Transformer [LOT], for any short. You must desolder it out from the circuit for this check, and check it for collector to emitter leak. If this will happen, the main regulated power supply ie 120VDC, will gets shorted through this transistor, cause a dead short circuit. If it is shorted, you must find out the reason for that short.

If LOT said above has damaged, this transitor will also get shorted. In otherwords, if LOT is damaged, its driver transitor,will also will get leaky. You just replace this transitor with an identical one. Switch on the tv for a while, say 10 seconds or so, check its heat effect. If it heats up abnormally, surely LOT has damaged, and you should replace it also with an identical type and number. Ok

Nov 24, 2010 | Philips 32PT563S 32" TV

1 Answer

WHEN TV IS PLUGGED IN TO OUTLET, EVEN WHEN TV IS OFF, i GET A LOUD WHINING NOISE AND STILL NO PICTURE


There is a short inside the set. Most likely the horizontal output transistor has shorted. The whining is the power supply being overloaded. Lots of things can cause this.

Oct 20, 2009 | Standard (CRT) Televisions

1 Answer

RECOR COLOR TV dead high pitch whining noise


you have a short in the horizontal ckt,look for diodes,horizontal output it might be damage or a bad cap, if not the fly-back transformer is gone.

good luck


caypianan@yahoo.com

Oct 20, 2008 | RCA F32650 32" TV

1 Answer

Magnavox MS3252S431


Replace:

Q7461 C33725
O7463 C32725
C2455 47uF@50V

May 23, 2008 | Proton MM2701VT 27" TV

1 Answer

Magnavox MS3252S431


Replace:

Q7461 33725
Q7463 32725
C2455 47uF@50V

May 22, 2008 | Proton MM2701VT 27" TV

2 Answers

High pich whine from CT-36D32 36" TV


jdosk-the high pitch noise you hear is generally from the horizontal output being shorted,the horizontal output is usually near the flyback transformer,get a digital multimeter to checkthis part.Let me know I'll try to help. cooltek Feb.16/08

Feb 05, 2008 | Panasonic CT-36D32 36" TV

1 Answer

Kv24fs120 dead set with two led blinks


Two-blinks of the "Diagnostic STANDBY/TIMER LED" indicates one of two things:

1) Horizontal Output (Q502) in shorted on the A-board.

or

2) IC702 is shorted (CB board)

Two-blinks of the diagnostic red LED is a " B+ Overcurrent" problem.
The red LED will blink 2-times, stay off for 3 seconds, then blink 2-times. The cycle repeats.

The circuit board is quite delicate. One should not attempt repairs (unless one has high quality vacuum desoldering equipment such as a PACE desoldering unit).

Feb 01, 2008 | Sony KV-24FV12 24" TV

1 Answer

Magnavox tv problem a green vertcal streak on rt side


Dickson do you have a speaker next to your tv anything magnet will change color it may need demagnatised

Maxol your tv more then likely has a bad picture tube or you have a shorted transistor for green output shorted on CRT board.

ThankYou for using FixYa. Have a Nice Day.

Dec 28, 2007 | Philips Magnavox 27MS343S 27" TV

2 Answers

Rca f27442


Check for shorted base-collector junction on horizontal output transistor designator Q14401. Also coil L14401 going to base of transistor needs to be desoldered, scrape ends, resoldered. If horizontal transistor is shorted, real possible flyback transformer bad.

Dec 16, 2006 | RCA F27442 27" TV

Not finding what you are looking for?
Proton MM2701VT 27" TV Logo

Related Topics:

123 people viewed this question

Ask a Question

Usually answered in minutes!

Top Proton Standard (CRT) Televisions Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

isaac johny
isaac johny

Level 3 Expert

796 Answers

Jaime Hernandez

Level 3 Expert

2267 Answers

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

Answer questions

Manuals & User Guides

Loading...