Question about Samsung Televison & Video

1 Answer

My tv flatscreen (LE40A557P2FXXU) seems to be stuck in stand by mode "red light flashing" and when switched on via remote nothing happens, ie tv wont come on. Also when the switch on the side of the tv is pressed the red light blinks faster but still wont come on.HELP PLEASE. Or is it a new tv.

Posted by patchek on


1 Answer

Sometime Mechanic

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    Visited the website for 3 consecutive days.


    An expert who has written 20 answers of more than 400 characters.

  • Expert
  • 122 Answers

Internal checking circuits, most likely the high voltage circuit. Take off the rear cover. From where 120 volts AC, leads to a fuse, then to a small high voltage transformer, then a capacitor. Check DC voltage at the capacitor. For me it was 380 volts. This capacitor needed to be replaced. Samsung uses a 100 uf rated at 450 volts. Found some old power supplies and got two capacitors - 150 uf and 220 uf both rated at only 400 volts. Had to connect them in parallel making 370 uf. The voltage check was 391 volts, but my TV is now working.

Posted on Jan 12, 2018


4 Related Answers


  • 1 Answer

SOURCE: TV won't turn on

my philips plasma tv just shut of on me one night, i tried everthing 2 get it working. A repairman said to fix it approx $450.00. I paid over $2500.00 3 YEARS ago didnt know if it was worth paying out that money and then it breaking down again. For three months i kept the tv untill i decided what 2 do, couldnt bring myself to trash it. So this week i took of the back panel there was so much dust inside carefully removed all the dust, Still it wouldnt work so then i decided to go to where the powercord is to see if anything burned out, it hadnt. I followed where the cord went to and noticed that there was a fuse beside where it when on the board so i removed it when to lowes and bought replacement fuse for $1.75 put it in and bingo it started back up after about 4 months of trying.I hope it works for you. you have nothing to loose you will have to either trash it or let some repair man rip you off . Good luck

Posted on Nov 29, 2009



  • 1 Answer

SOURCE: my ilo tv seem like

Icould use s fix for this too tv use to last more than 3 years no luck for mr

Posted on Nov 22, 2010


  • 1 Answer

SOURCE: how to reset lg lcd tv

how do u reset ur password if u forgot what u put in

Posted on Aug 26, 2011

SOURCE: samsung le40a557p2fxxu,tv looks likes its stuck on


The only way to reset the TV is to remove the cord from the wall, wait for about 1 hour, plug the TV back into the wall, and turn it on. If it still doesn't power up, it means it has developed a power fault.

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to. This problem may have occurred as a result of irregular power supply, or excess power supply or power surge.

The TV is receiving current but cannot circulate or transfer the current to other necessary part of the TV because of the defective power supply board. You might be lucky it's just a blow fuse. Also a defective transformer can cause your TV not to power on.

All these can be checked on the power supply board.

But 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 ""(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 from

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.


Posted on Sep 28, 2011

Add Your Answer


Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The red power light comes on but nothing else works on my hitachi 53FDX01B PROJECTION TV

silly question but have you tried turning it on with the remote. if a tv has been turned off by remote and then power goes, turning it on by the tv switch will put the tv back in stand-by mode and you need to use remote.

just a suggestion.

Dec 13, 2013 | Hitachi 53FDX01B 53" Rear Projection...

1 Answer

What if the tv is off and the red stand by light is not on what does that mean

A lot of people are confused about turning the TV 'off'. If there is a light showing when the TV is 'off' it is merely on 'stand-by' and not truly off. Off means being physically turned off by either the switch on the set or the mains. using the remote to turn 'off' the TV will not turn off it will only put the set into stand-by mode. In many cases if the TV is in stand-by mode, and then switched off, when the set is turned back on, it will still be in stand-by mode, and will need to be turned on with the remote. (even if you unplug, in some cases) All TV's are different, so will operate differently of course.

Apr 04, 2013 | Sylvania Televison & Video

1 Answer

My Element 40" Tv is stuck in stand by how do I

hi have you changed the batteries in the remote, if the remote is ok there's a fault with the tv, could be a swollen capacitors shorted diode or poor solder joint,or a bad mainboard , thanks


Mar 08, 2017 | Element ELCHW402 40 in. LCD HDTV

2 Answers

My Harman/Kardon AVR 140 is stuck on stand by mode

I have the same problem on my AVR 1550 - its been bugging me for ages then it works again, then it doesn't ...

Aug 28, 2009 | Harman Kardon AVR 140 Receiver

1 Answer

TV will not switch on from stand-by mode

keep pressing the channel up button and switch on the tv( plug it to the power). then release the channel button and press power on.

it should work.

Mar 29, 2009 | Panasonic Televison & Video

1 Answer

When i switch on my digital Panasonic TV (Model TX-32LMD70)using the remote control from standby (red light showing) the green (on light) flashes and then nothing happens i.e. the television does not...

Is your TV still under warranty? This problem seems common on this site with the Panasonic brand. I really can't say what exactly is causing this problem, but it seems like something in the power circuit board is faulty. My advice would be to call Panasonic's Technical Support Hotline and speak to a Technician. It could even be a problem that has warranted a recall of that particular model. The number for Panasonic's Hotline is 1-800-211-7262. Or, you can contact them via e-mail @ under "Get Support". Hope this helps...

Sep 08, 2008 | Panasonic Televison & Video

1 Answer

Viera TH-50PX70BA

I called out a TV repair-man in the end!!!

Jun 20, 2008 | Panasonic VIERA TH-65PV500 65 in. Plasma...

Not finding what you are looking for?
Televison & Video Logo

Related Topics:


Ask a Question

Usually answered in minutes!

Top Samsung Televison & Video Experts

The Knight
The Knight

Level 3 Expert

76584 Answers


Level 3 Expert

513 Answers

Cindy Wells

Level 3 Expert

6259 Answers

Are you a Samsung Televison and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides