Question about Vizio SV421XVT 42 in. LCD TV

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Tv lcd vizio sv-420xvt1a no picture no sound back light on 12v

5v,2.5v,3.3v,1.8v are good
but remote control dont work

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The problem was are in the main board control p/n 3642-0492-0150

Posted on Dec 18, 2009

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Posted on Jan 02, 2017

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Need service manual for vizio model vf551xvt/vf5521xvt


It will be difficult to get this document over net; because, they don't have their on circuit design. all of it are borrowed. Contact the authorized service centre.

Dec 24, 2015 | Vizio VF551XVT 55 in. HDTV

1 Answer

Vizio logo does not light up amber when plugged in but turns white when power button is pressed. no picture or sound. Big Transformer on power board makes a light buz sound when plugged in also.


1. When the TV powered up, please measure the 24V, 12V & 5V are there, if one voltage is missing, you may have a defective power supply.

2. If the power supply lost the 24V source, you may unplug the power supply connector on both the inverter board, then power it up, if you got the 24V back, you do have a defective inverter board, you may unplug them one at a time to locate the bad one.

3. If the power supply & inverters are good, you may have a defective main board. The common problem on the main board is that a voltage regulator is bad, you may use your millimeter to measure them 1 x 1. The out put voltage (on the heat sync) should be 1.25V + the control voltage (Pin 1), for example: if the control pin voltage is 0, the output voltage should be 1.25V, if the control voltage is 2.05V, the output voltage should be 3.3V, if one of them is out of range, replace it, you may find the part from Digikey Co. The part number printed on the regulator is AMC1117.


Good luck!

Apr 08, 2015 | Vizio VX42L 42 in. LCD TV

1 Answer

Dynex PO2-w30-003s no picture sound ok


put a flashlight behind the TV screen or front screen close, just try as close as possible, if you see image that means that the Back-Light inverte is defective or the screen lamps are not working, if deres no imagen the video card is not working (main board)

Aug 06, 2014 | Dynex DX-LCD32-09 LCD TV

1 Answer

Can't turn tv off or on with remote.


Main system control section circuit fault. Contact any service technician to get it repaired. The 5V supply line voltage should be checked. Gopakumar Gopalan Google

Aug 05, 2014 | Vizio VO42L 42 in. LCD TV

2 Answers

Vizio VT470M no picture, no sound, no backlight. Power supply board looks good all voltages appear correct (24V, 5V, and 3.7V) and no "bulged" capacitors . When I unplug unit for two hours, the...


Im having similar problem and with my limited knowledge of lcd tvs and the voltages ALL being good except the pwr on or sw on voltage from the main board to the power supply which tells it to switch everything on Im guessing that something is going wrong on the main board. In the condition where it freezes it (the power on V) which switches everything on i get varied voltages such as 2.5 or 3 or (the normal 5v) and then when nothing powers up (blank screen) i read 0v on pwr on voltage but all my other voltages are corect (24v to inverter, 12 v to main board, 5v, etc.) Im guessing from researching this is that there is in improper voltage somewhere in the main board circuit. I have been unable to find it so i may order another board and post back.

Jun 19, 2012 | Vizio VT470M 47 in. TV

3 Answers

Have a vizio vx 42l on the bench. amber light only no power up have my standby 5vdc and my 3.3vdc power button is sending a high pulse to the main mod but i dont get pson to the power supply mod suspect...


This is your mainboard needing replaced! Simple as that!

The main sends the pson signal and without it...you have a dead tv.


Please rate if this helped :)

Mar 10, 2011 | Vizio 42 in. LCD TV

1 Answer

Bought new Vizio 55"


Had same problem - turned off Adaptive Lumina, Backlight control, and Ambient light sensors on the Vizio advanced picture settings and the Dish remote now works. Vizio was emitting an infared signal that interfered with the Dish remote signals with these settings on. TV still works and looks just fine... But best of all Dish remote works too.

Nov 08, 2010 | DISH Network IR Remote Control

3 Answers

42" vizio vw42l - no picture or sound


If the backlights for the screen do come on and you also have 12v and 5v feed the main board then it does sound like the mainboard will need to be replaced.

Nov 28, 2009 | Vizio VW42LF 42 in. LCD HDTV

2 Answers

32'' Vizio LCD no picture or sound


Your filter capacitors have popped due to diodes shorting, P-channel FETs shorting from gate-to-drain. Pull-up resistors have changed value and as a result your capacitors have peaked (popped)....so now the tv is in protection mode to prevent further damage to your tv. Take it to your local shop for servicing, or take it back if its under warranty......

Nov 05, 2009 | Vizio L32 32 in. LCD HDTV

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