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Have a SHARP LC-46LE620UT TV with sporadic audio & video black outs / sometimes it is worse than others times eventually goes out completely for a couple of days/comes back and works fine for weeks.

THE BLUE "ON" LIGHT STAYS LIT WITH NO PICTURE OR SOUND.

Posted by Tomas on

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The Knight

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  • Sharp Master
  • 76,407 Answers

Fault with the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. 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/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.

Posted on Jul 11, 2020

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5 Related Answers

Anonymous

  • 1 Answer

SOURCE: Sharp aquos lcd screen goes blank

i was having these same problems with the screen going black, and i found that when i hit the back of my tv it would work sometimes. so, i improvised on some of the advice on this page and so far no problems. here is what i did (its very easy):

1. lay the tv on the floor and take off the back panel. (i think 12 screws)

2. on the right side of the tv (as you are looking at the back) you will notice a large metal covering that is held in place by 6 screws. unscrew these and remove the metal cover.

3. you will notice that the three screw holes on the left side of the board have some sort of metal or solder around them, in sort of a star pattern. when i looked closely i noticed that most of the metal (solder) was tarnished, or kind of blackened. (this must mean that the ground screws werent getting a good connection and this would explain why it would work sometimes when i hit it because it would vibrate the screws enough to get a good connection! )

so, take a pencil eraser and erase all the black or tarnish off the metal surrounding the screw holes. thats it! (to be safe i took some sandpaper and cleaned up the screw holes on the back of the metal covering, but i dont know if that was necessary)

at this point i followed another gentleman's advice to do a hard reset. this involved unplugging the 8 connections although i dont know if this was really necessary because i believe my problem was a ground issue. i did it just to be safe. his advice is on this site if you want to do this step.

4. i put everything back together and it worked! i performed a soft reset at this point which puts your tv back to factory settings. just go to menu>setup>reset>return to factory settings? yes
this will turn your tv off and back on. that's it. so far so good for me.


Posted on Dec 18, 2008

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localwonder

Michael Masters

  • 6784 Answers

SOURCE: TV loses power

hi, this is typical capacitor issues. they are failing to hold there charge load. they will eventually blow and render the tv useless. these are located on the power board. i suggest a repair in the near future.

Posted on Mar 07, 2009

romsky79

rommel dadulla

  • 822 Answers

SOURCE: I have a 32

i know your problem. its an inverter loose connection from CCFL to inverter output. back of your LCD inside the TV. try to remove and re-connect again. be sure no power and AC is unplugged. [email protected]

Posted on May 28, 2009

Anonymous

  • 4 Answers

SOURCE: Motorola DCH3200 cable box: sound and sometimes video cutting out

Sounds like your SNR is getting too high and causing the signal to overload. A few things can cause this a bad splitter that causes the signal to bleed and introduces noise, or a more common issue is having a weak signal coming from the cable provider and once it goes through a splitter it causes the signal to become to weak to be stable.

Since it sounds like your cable has been working up until recently, you may have had a cable or splitter go bad.

Call comcast and have a technician come out and test the line.

Posted on Sep 19, 2009

Anonymous

  • 1 Answer

SOURCE: Sanyo DP46840 purchased less than 1 week ago from

Hi gregschirk,
I bought the same model and I am experiencing a similar problem. My HDMI components worked fine before. Now both my cable box and DVD player will not be recognized as HDMI systems. It thinks they are DVI to HDMI connections. Good picture but no sound. Would like to know if there is a fix for this.
Thanks Gilbo72

Posted on Dec 26, 2010

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