Question about Sanyo DS27510 27" TV

1 Answer

How to test the voltage regulator

I need to test the voltage regulator which is a c4423. I would like to know what readings i should be getting.

Posted by on

1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 10 achievements.


    An expert that got 5 achievements.


    An expert that has over 500 points.

  • Expert
  • 337 Answers
Re: how to test the voltage regulator

The only test you can do on this regulator is to see if is shorted or not,this is a switching regulator ,that means is design to be use in a switching power supply witch turns the transistor on and off constanly and uses feedback to stay regulated,the B+ they use in the collector is around 150 volts,an small square wave is applied to the base ,it gets amplifies and energizes the primary side of the transformer to generate all the supplies ,one of this supplies provides the feed back.I hope I have given you the more than the information you needed.

Posted on Oct 16, 2006

Add Your Answer

0 characters

Uploading: 0%


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


3 Points

Related Questions:

1 Answer

How do i fix this unit sharp 14v-w150m having a shot down problem. it shots down the high voltage during occelation. thank you.

You have a bad capacitor. I do not know your TV model number. Find a 160 volt to 250 volt capacitor at 1mf. Replace with same value. This will fix hundreds of TVs.

Dec 28, 2014 | Sharp Standard (CRT) Televisions

1 Answer

Fault finding

If your tv does not turn on at all Look for the voltage rectifier, voltage regulator. Diodes and resisters in the power circuit. Burnt solder traces, the flyback transformer, the horizontal and vertical output transistors. and especially bulging or dry electrolytic capacitors (which is what caused all of the others to fail) The symptoms that the electrolytic capacitors need replacing are lines on the screen, and later black bars on the top and bottom of the screen. To test any semiconductor use a solder ****** and a solder gun to remove the solder gently until you can remove each part test using a multimeter on diode setting. test the legs in any order for open circuit or short circuit if you have a high reading one way and a small reading the other way then the component is good. Any component that gets hot enough to need an aluminum heat-sink is suspect.

Oct 20, 2013 | Panasonic Standard (CRT) Televisions

1 Answer

Samsung tv no led indicatior glow.. voltage regulator 3s125r have a primary voltage and secondary no voltage

if no secondary voltage at the regulator that was mean the regulator is bad which need replacement.the output supply will not pass through to the other circuit which turn on the tv.

Aug 17, 2012 | Symphonic ST420FF 20" TV

1 Answer

No power

on which side of + you`ve tested?you must test the running voltage (dc)accross the filtered power supply capacitor or test the capacitor itself,then to the power regulator transistor....detach d chopper`s secondary and test for it`s a.c.if accurate it`s out put.if low,test out of circuit your power reg. transistor.if theres any development please let me know and let us solve it well.....

Jun 10, 2012 | Standard (CRT) Televisions

2 Answers

The problem i have with this tv is not regulating it use an str 30120 I'm not having 120 volts out of the regulator instead I'm having 149 out this regulator....but my problem is I do not have the...

there is a faulty capacitor in the regulator or power supply itself. Also slight tendency for the high voltage transformer to blow out, Not sure if you model has this or not. I do not have a manual.

Oct 12, 2009 | Konka K1938U 19" TV

1 Answer

Set shuts off expecially if a commercial comes on or the scene is a dark one. will restart but sometimes it takes three or four times. the longer the set is on the more it will happen

This may be caused by a faulty or a badly soldered low voltage regulator.

You need to find a test point for the low voltage named "B+" and check if it is stable when the brightness goes down (dark commercial, channel change, brightness change).

If the "B+" voltage is not constant, this means that the part that regulates it (a regulator IC or associated components) is probably faulty or may be loosely soldered to the circuit board (loose solder joints may often cause such problems since the loose contact on the pins of a component becomes even worse when a component heats up.

It is not a bad thing to have a detailed schematic of the set - it will save you time when you search for the test points and components which need to be inspected.



Oct 01, 2009 | Sony FD Trinitron WEGA KV-36HS420 36" TV

1 Answer

My vs-60607 has waving lines

postive 9v regulator on the signal board and possible capacitor right next to it. the regulator is generic 7809. if you test the output it will be 6 or 7v needs to be 9. when the lines go away it is warm and will read 9v. so do the test cold. i'm assuming you know how to use a multimeter. if not then a local repair shop can do this for you.

Jan 01, 2009 | Mitsubishi VS-60607 TV

1 Answer

TV Needs new 5 volt regulator

Check for DC output at D653, if you have voltage there find Q682 and measure the voltage at the emitter. You should get 5 volts.
Just a question, if you are missing the 5 volts; do you have any other functions on the TV not working?

Apr 17, 2008 | Emerson EWF2004 20" TV

1 Answer

Sanyo TV Model# DS32224

This is usualy because there is either a high voltage regulation fault, or a main power supply regulation fault.

There are many things that can cause this. When the high voltage goes too far down, the raster will enlarge. High voltage regulation can be caused by faulty components in the feedback sensing, or in the high voltage multiplier, or in the flyback windings itself.

A quick way to sort of know if the high voltage is regulating is to wind the brightness and contrast from one extreme to another and observe the raster size. If the raster is changing size with the brightness on the screen, the regulation is not working well. In some of the low cost sets there will be about a 2 to 5% raster size shift in this case. The high end sets will have a near 0% shift in the raster size. A size change of about 2% is acceptable for most sets. If the CRT is weak, this test will not work well, because a weak CRT will not properly load.

If the main power supply is operating slightly over voltage, the raster size will increase. Usualy, the brightness will be a little on the high side when the supply is too high. Voltage regulation faults can be from warn components in the voltage regulator area, or in the feedback control.

This should be looked after by an experienced TV service tech. This type of fault can be involved.

Jerry G.

Nov 09, 2007 | Sanyo DS32224 TV

2 Answers

Question about the voltages.

what is the question please?

Oct 20, 2006 | Sanyo DS27510 27" TV

Not finding what you are looking for?
Sanyo DS27510 27" TV Logo

Related Topics:

1,289 people viewed this question

Ask a Question

Usually answered in minutes!

Top Sanyo Standard (CRT) Televisions Experts

The Knight
The Knight

Level 3 Expert

66623 Answers

matt martin
matt martin

Level 3 Expert

1187 Answers

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers

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

Answer questions

Manuals & User Guides