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My vizio tv model VT420M has no power or lights. I have replaced the power supply board with no result. What do I do next? Is there something else I need to check?

TV model Vizio VT420M Part replaced was :Power supply part number ADTV82421AAD Y9 stamped 715G3196-1

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  • yadayada
    yadayada Dec 10, 2016

    And you have verified the power cord is live at the input to the TV?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Power Supply Board

http://www.encompassparts.com/products/?VIZ0500-0502-0102

This is the only place I founf that carries the
part.

Posted on Jan 05, 2009

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ginko
  • 19396 Answers

SOURCE: 42" Vizio - no picture no sound

If the TV goes in standby, then it is in protection mode.

Ensure also that the fault is not coming from a faulty receiver box sending
bad signal, check if you get same problem on DVD with no receiver box
connected.

Try first leaving the TV power cord unplugged for some times, let say one hour or so.

The flashing light indicates a diagnostic state called protection.
When the TV goes on protection there are only two possible causes.

1The internal circuits are jammed because of electrostatic charges accumulating on capacitors, or because of a wrong voltage read by the main chip on your monitor controller board. this started the protection circuit.

2 The protection circuit detected a wrong voltage or abroken contact, identified an internal fault and kicked in , starting the flashing light.

If you are in situation one, then the TV will reset just unplugging power cord for one or two hours,sometimes even minutes.

If you are in situation 2 , then there is an internal fault.

If under warranty contact the manufacturer ringing the number on the user manual

If you want to repair at your own expenses, just locate any good qualified repairer.

If you want to DIY you find parts here,

All: Appliance parts, electronics parts & more from PartStore.com

Encompass Parts Distribution

LCD/Plasma Electronic Replacement Parts: Plasma & LCD TVs, Appliances |


On LCD Pay particular attention at inverter and power board, power board can be inspected looking for bulged or leaking capacitors, then tested with a multimeter. The inverter is more difficult to test , there is need to read voltages, should be done by a tech. Also the LCD controller board can cause same problem

Posted on May 04, 2009

  • 1 Answer

SOURCE: no picture or sound, light comes on in the front and have to unplug tv to turn it off.

I had this exact problem on my Vizio 47" HDTV. I removed the speakers and all the screws on the back cover. Took the cover off and located the fuses on the largest circuit board. The are in the upper right hand corner of the board. There are 3 of them in a row labeled LF 1.5, LF 3.0 and LF 3.0. The are white in color with copper ends. I took a volt meter and measured continuity across all fuses individually and found the LF 1.5 to be blown. The guy at the electronics store sold me a barrel 1.5A fuse and told me to soldier it across the top of the blown fuse. It took an extra set of hands but the TV works perfectly.

Posted on Jun 23, 2009

  • 1 Answer

SOURCE: Power Supply Board for SAMSUNG 40" LCD TV Model LA40R81BX

You'll find some Samsung power supply boards here : http://www.usefulparts.com/index.php?main_page=index&manufacturers_id=11&sort=20a&filter_id=98&alpha_filter_id=0
but you have to open your TV first and find out model number

Posted on May 10, 2010

  • 14 Answers

SOURCE: My vizio e371vl will not power on but the orange vizio stays on

Just had one in the shop. It was bad solder joints on one of the resistor packs near the main IC. These packs don't have legs and don't touch the pads. So it is easy to have a bad connection.
Try resoldering all the r-paks on both sides of the board near that main IC. Good luck!

Posted on Dec 25, 2012

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Visio E550i-B2 Have sound but no picture. Did a flashlight test and I see an image. Google search results point to bad LED driver but I would like a second opinion. Thanks


Back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis. http://electro-medical.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

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Whats wrong with my TV ? I have a vizio 60 inch smart tv. When I turn on the TV the screen is blank. I do have sound and the screen does glow. Something is wrong with the backlight. How do I fix it?


Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement.

Oct 26, 2015 | Vizio Televison & Video

1 Answer

Hi I have a vizio vt42om the logo lights up then goes off is that the inverter board or the power supply or just the fuse


Sounds like main board fault. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ . In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Dec 01, 2014 | Vizio VT420M LCD TV

1 Answer

VT420M no sound or picture and turns off by itself


this sounds like a main board failure but a defective power supply can mimic some symptoms of a bad main board. I would recommend you get a diagnosis done on the set. If I was a betting man, I'd guess the main board

May 27, 2013 | Vizio Televison & Video

1 Answer

Service manual


Send your email address to me by Fixya comment, and get a copy of the service manual by return mail.

Jul 13, 2012 | Vizio VT420M LCD TV

1 Answer

I have a Vizio VT420M. When I turn it on by remote, or power button, the Vizio light changes from amber to white, but I get no picture at all OR sound. Do these symptoms sound like a bad power supply,


Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

Mar 25, 2017 | Vizio VT420M LCD TV

1 Answer

My vizio tv will not turn on


I have repaired many of these over the years. Vizio s have regulators on the main board that have been failing causing this problem. You can verify that the power supply is working by the Vizio em-bloom lighting up on the front of the set. Hope this helps. :)

Apr 28, 2017 | Samsung LE40R73BD 40 in. HD-Ready LCD...

1 Answer

Was told my backlight was out on my vt420m and it needed to be replaced


The backligts lamps rarely go out, but the backlights inverter boards that drive the lamps do go out often, you may need better tech that has real experience troubleshooting LCD TV.
Power supply, main board can also cause no lights on the screen. I would get second opinion.
Please read my guide to understand how LCD TV works.

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

Jun 29, 2011 | Vizio VT420M LCD TV

1 Answer

My Vizio VT420M LCD TV has for several months has changed to a dark screen while viewing without any other problems. We always hit "power/cable" on the HD cable box and it would immediately come...


Now the tv u turn on u have a flashes of a picture only few sec. and died have sound left only?Yes,than the 2 long boards call the LCD inverter boards are the causes and the problems.These 2 long LCD inverter boards help the LCD screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those 2 refurbishes long LCD inverter board for the replacement.

Jan 15, 2011 | Vizio VT420M LCD TV

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