20 Most Recent Vizio SV420M LCD TV Questions & Answers

Hi Thomas, Before going to main board, please check the speakers. Good luck.

Replace the main board of your TV. You can get marts from here and fix it yourself. www.shopjimmy.com

Sure that the other boards you used were any good? If so, then try the Power supply board since the other boards of your set other than the main board specialize in the video aspects. Since you have no audio the only two boards that could account for no audio are the main board and the PS board which powers everything in the set.

So the power button is the only one that functions? Double check your main board, IR sensor, and key controller connections. You should not need a code at all. The only programming you should have to do is to do a scan for antenna channels you may use as well as setting up any of your personal preferences. Did you order the exact part # as the old one?

It may have bad IR sensor board due to no 5vdc feeding it or the IR sensor is bad, it can also be the main board is not processing the signal from the IR board. It will require in-depth troubleshooting or you can try new board.
http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+SV420M

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: www.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.

Contact the authorized dealer for Vizio.

http://www.manualowl.com/p/Vizio/SV420M/Manual/21355user guide and manuals

Hello,
if your TV doesn't have picture or sound, then it means it's having a power problem. There is a shot on the power supply board of the TV. Therefore, the power supply board cannot circulate full voltage/current. So there won't be sound or picture.
The TV might have worked fine in the past, but that's electronics for you. Power surge, irregular power supply, excess power supply, etc can affect the unit thereby not making it to work properly.
More often bad capacitors causes problem on the power supply board. I do not think the power board needs replacement, rather those defective capacitors is causing this issue. Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.
The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)
You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.
What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).
You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors). After replacing these capacitor(capacitors) most likely the normal operation will be restored. Or you can by a refurbished complete power board to save you some stress.
Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.
If you don't know about TV repairers, take the TV to the nearest repairman to fix the fault for you. Also, note that TV stores a lot of current, so wait a while before opening the TV back cover.
I hope this helps.
Regards.

You have to match the screen exactly since the T-CON and backlights inverter boards are part of the LCD panel assembly.
Even same TV model can have more than one brand of the screens installed.
You have to open it up and get the number as printed on the panel sticker.

Basic troubleshooting guide here: 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: www.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, long life rating such as PANASONIC FM or FC series.

replacement panels cost more than a new tv