Question about Vizio SV421XVT 42 in. LCD TV

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No high voltage but intermitant - Vizio SV421XVT 42 in. LCD TV

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TV Parts Universal TV Stands DLP Chips ShopJimmy Go to this site to get replacement power supply board. It's not a difficult job to replace it yourself.

Posted on Apr 03, 2015

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Posted on Jan 02, 2017

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2 Answers

A/C BLOWER MOTOR rus slow intermitently at all settings


Could be the blower motor, or the resistor.
I would check the voltage at the blower motor first.
The ground circuit goes thru the resistor and controls the speed.

Sep 17, 2012 | 2007 Toyota Yaris

1 Answer

The low beams on my pilot are blowing, if that makes sense. My high beams will work fine, Ive had to replace the bulbs more frequently than I know I should have to. Do I need a specific bulb or a higher...


This was a fairly common problem for older cars. It was usually caused by a bad voltage regulator, that allowed the voltage to get too high. I recently fixed the same problem on a 1986 Dodge.
I haven't heard of this on newer cars. The newer cars have electronics can be very sensitive to voltage spikes.

Anyway, I still suspect that the high voltage is the problem. You can have the voltage checked, but it may be intermitent. Most modern charging systems have the voltage regulator integrated in the alternator. An alternator can be pretty expensive to replace, just to try it out. You could have the alternator checked at an auto parts store. Or you may have to have it checked by a auto tech/dealer.

Another possibility is the type of bulb you are using. I replaced the bulbs on my Escape with Sylvania Silverstars. I blow them pretty regular; every 6mos or so. This is fairly common with high output headlamps.

Aug 10, 2011 | Honda Pilot Cars & Trucks

1 Answer

What are these codes that appears on my engine check machines? p1391,p1297,p0108,p1492


P1391 Intermitant loss of cam or crank; P1297 No change in map from start to run; P0108 Map sensor voltage too high; p1492 Battery temp sensor too high.

Apr 16, 2011 | 2002 Chrysler Sebring

1 Answer

Wiper problem-93 Ford Ranger XLT,2 wheel drive,3.0 v-6.auto. Only have high speed,no more intermitent,no longer returns to start position-HELP


probably the motor but chaeck this first G3 CHECK CIRCUIT 58 FOR BATTERY VOLTAGE
  • Unplug wire harness connector.
  • Set wiper switch on low.
  • Check Circuit 58 for battery voltage key on.

    k17829a.gif

arrow.gifVoltage OK
CHECK for malfunctioning wiper motor. Perform low speed current draw test. SERVICE as required.
arrow.gifVoltage not OK
CHECK for:
  • Open connector.
  • Malfunctioning switch.
  • Malfunctioning governor.
  • Open wire Circuit 58 (W).

Jun 02, 2010 | 1993 Ford Ranger SuperCab

1 Answer

Canno turn the tv on.


You probably have a main or high voltage power supply problem; the latter produces the 20,000 plus volts for the CRT and gets its voltage from the main supply. It's difficult to say which is at fault without a few measurements.

Feb 14, 2010 | Sony FD Trinitron WEGA KV-32HS420 32" TV

1 Answer

Spacemaker (JVM1871SK) 1800 Microwave doesn't microwave


Remove the case and see if you can localize the smell. Likely suspects are a shorted high voltage diode (replace) or a shorted stirrer bearing (replace stirrer)--a fan-like device located within the sheet metal waveguide near where the microwaves enter the cooking cavity. Make sure to have a cup of cold water in the cooking cavity when looking for problems. The problem could also be the high voltage transformer or the high voltage capacitor, but these are more rare problems. There are no radiation problems with the case off, but there are high voltages associated with the magnetron and it's power supply.

Oct 08, 2009 | GE Profile Spacemaker 1.8 Cu. Ft....

1 Answer

1999 Honda Passport 4x4 auto intermitent high pitch winding noise


try checking the tension on all the belts(fan/water pump, power steering, alternator). If loose, they'll whine.

Feb 26, 2009 | 1999 Honda Passport

1 Answer

Flickering headlights


Check with a GM dealer to see if there is repair bulletin on the voltage regulator in the alternator.

Dec 15, 2008 | 2004 Chevrolet TrailBlazer

1 Answer

Dell Ultrasharp 2005fpw


The problem you are describing is definitely a bad picture tube.please replace it or the problem you are describing sounds like high voltage regulation problems. The easiest way to tell is by changing from a black raster to a white raster. If the size changes quite noticeably or jumps alot then you have a regulation problem. The first thing to do is check your high voltage while changing the raster from black to white. If the HV varies by a large margin, then you have a flyback problem. If it doesn't, check the voltage at the collector of the HOT while varying the raster again. If the voltage changes alot then check your B+ line. Typically what goes out in this case is a capacitor(typically 100uf-350v or so) or the B+ regulator. Hope this helps.

Jan 26, 2008 | Dell UltraSharp 2005FPW 20.1" LCD Monitor

1 Answer

Sony KV27v15 DOA


The high voltage circuit also runs the horizontal deflection circuit and much of the rest as well. The horizontal problems you describe were a prelude to high voltage failure. If the TV is anywhere near 10 years old (how come you guys never give the age????) it isn't worth the cost of overhauling the high voltage circuit. You might be able to replace just the H.O.T. but the flyback is the source of the failure.

Jan 09, 2008 | Televison & Video

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