Question about Samsung LN40A450 LCD TV

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Just checked with a technician for bad capacitors but couldnt find any... considering the tv is still quite new.. bought in april... im facing the same problem... the tv won't power on but the standby light is still on and responding to the keys... any one can help? im stuck with only local warranty and i've left for a new country...

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  • dharvish_chu Nov 09, 2010

    oops... there an error with the model number: mine is a plasma display: model number ps42p430b2m... looks like all capacitors are still working... the technician highlighted a possible micro processor error... due to over heating.



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Posted on Nov 09, 2010


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Repair Sony nsx-40gt1 tv, no picture, 2 red blinking lights where normally green. Is the power supply board bad, t-con bad or main board bad. Who sells repair manual?

Hello Eric,

shopjimmy has the circuit boards and gives live support..

Check out the URL below.

Also consider getting an anti-static wrist band... so you don't destroy good semi-conductors with tiny static sparks.

Further information on that is under "ESD"
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Green light on my Sony Bravia KDL40BX420 is on but no picture just a solid green light

hi there bare with me here i havent a clue how this works but. But as regards to your problem its the capacitors in your tv dont worry its quite easy. in your tv there are like little small things called capacitors and they control the power the tv coming on and things like that. what i did was looked on the web , youtube , on how to fix and replace a capacitor in my "model " tv and videos came up as to what to do and how to do it. dead easy i went about finding the bad blown capacitor and went to maplins and bought the new one and replaced it. and it worked a dream.
dead dead easy rtealy is. if you want to contact me email me at

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Our 42" visio flat screen, bought in 2007, is

Yes this can be fixed, it is probably caused by a some faulty capacitors either on the power supply board or the inverter board. Have a technician come out and check the capacitors in both of these circuits.

Sep 08, 2011 | Vizio 42 in. LCD TV

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Purchased an RCA universal remote (RCRH02B) and the codes listed in instructions don't work. After programing (or trying) the device with all the codes individually, the TV will turn on and off,...

Consider that you may have a bad remote. You never mentioned why you bought a new remote. Did the original remote quit working? If so, the problem may be with the TV.

Jan 04, 2018 | Toshiba 13A24 13" TV

1 Answer

I just bought a new LG LCD and have noticed that when I first turn it on the morning it makes a noticable click sound about once every few minutes for the first ten or fifteen minutes, then it stops...?

moz-screenshot.pngmoz-screenshot-1.pngmoz-screenshot-2.png Hi, this could be a problem with the power supply in the tv, it is common especially on some Samsungs and specific repair kits are available quite cheaply if you have good soldering skills, this can also apply to many other Flat Screen TV's .

Usually this is caused by capacitors that have dried up and split, you can normally tell as the capacitors are bulging on the pcb, you can get them in a kit as I said eBayer's sometimes do them or you can buy them indivually from a good electronics components supplier, make sure you get the correct values for each!! marked on the side of the capacitors in xx/x V, xxx/x uF and 105oC. (the x's represent numbers)

The picture below shows the type of theing that happens, the brown ones are bulging/split on the top whereas the black one is fine.


High Voltages can exist in these sets, never attempt anything while plugged in and
if in doubt do not attempt it yourself and seek the advice of a qualified TV Technician.

There could also be dry solder joints on the panel, usually applies to the power supply as it's mainly these get the hottest.

Here's an example of what dry joints look like.....


High Voltages can exist in these sets, never attempt anything while plugged in and
if in doubt do not attempt it yourself and seek the advice of a qualified TV Technician.

It's also worth considering claiming under the warranty for replacement or repair through you dealer if warranty is valid.

Hope this helps


Feb 11, 2011 | Televison & Video

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My TV will turn on for approx 5 seconds. During this time no picture is displayed. The TV will then turn itself off and then will not power on. I can unplug the TV for a few minutes and then it will repeat...

Hi Gian,

This is an indication that you have a problem on the power supply section or on the load because of the following reasons :

1. Over Voltage - the regulator might be cycling on over voltage due to lack of load (Open).

2. Over Current Protection - excessive load or faulty power supply cycling will trigger the over current protection circuit.

3. Leaky Capacitor - a dried up main filter capacitor or other filter capacitor in the power supply that is producing an out-of-regulation condition. A bad filter capacitor on the output of a series regulator may result in excessive/drop of voltage and subsequent shutdown. The unit will not go through unless isolated the faulty parts.

4. A problem with the microcontroller.

This is not DIY and quite technical. I've advice you to look for a qualified technician or send it to repair shop to troubleshoot the problem. Also to consider the dry joints that will do the same problem as what you encountered right now.

But first check if your unit is under warranty then avail it because the manufacturer of your unit will fix it for free or with a little charge only.

Hope it may help you.

Thanks for using fixya.

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2 Answers

I bought on credit a SAMSUNG LCD HDTV Model LA37B530P7R last August of 2009, it was performing well until lately this October it just happened one day that I observed very faint flickering dark lines...


Mostly, when your televisions screen goes blank, it is not due to the lcd display, it most likely is caused by a component in the television.

And mostly is some capacitor on a panel that is causing the problem. Once a problem comes up and has to do with the screen, it is either the lamp is faulty or a capacitor got burnt on the main panel of the television.

You can assess it yourself by unplugging the television for some time and opening it up, then you open the cover protecting the panel and take very close looks at the capacitors (some battery like structures that are erectly placed on the panel) for any one that is burnt.

Once you detect the faulty one, you can replace it with a new one. Also take a close look at the lamp to see if it is not the problem.

Do not let any one reap you off your money, it is quite cheap to get a capacitor or a lamp and the problem is not a lcd display problem. you only have lcd display problem when your television falls or hits a hard object.

Take care

NOTE:' have a local repair man assess the television to explain further. Do not open if you are not familiar with such activities.

Oct 11, 2010 | Televison & Video

2 Answers

Power supply is bad on philips plasma 50 inch tv, it just clicks

nice job... thats the most common problem with all LCD tv's now

Jul 21, 2009 | Philips 50PFP5332D 50 in. Plasma...

1 Answer

Magnavox 19" TV shuts itself off.....won't stay on

I had a similar problem with my Phillips 42 in. LCD HD TV.

Here's the problem. The Power Supply Board. I opened my TV up(warranty was up of course) and found several bad capacitors. Phillips and several other companies were sold capacitors that although were highly rated failed within 5 years because of a lack of preservatives. All sorts of electronic equipment is now being effected due to these defective capacitors.
1. Take it in and have it fixed
2. Open it up, check the board for faulty capacitors(bulged or leaking) Buy a new Power supply board and install it.
3. Remove PSB, remove faulty capacitors and replace with compatible new ones.

Hope this helps

Jun 04, 2009 | Philips Magnavox 27MS343S 27" TV

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