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2 Year old 47LG50 TV with no backlight.....I have read some info on this sight regarding testing of the power supply using 2 car headlights. Can the power supply board be tested with a multi meter?

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Vizio 42 in L42HDTV10A no power no lights no nothing

Yeah if you don't have any power at all, no lights or anything its the power supply.

Posted on Oct 08, 2008

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SOURCE: not even 2 years old and no power

no red light on tv. no power only two year old, need help.

Posted on Jan 08, 2009

welcomejee
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SOURCE: I have a Soyo mtsytpt3227ab

Hi,
It seems back light inverter board is defective in said symptoms because you get sound in tv but no picture. Please point strong flash light at tv screen to observe faint image, if image is there then replace back light inverter board that is available with shopjimmy.com
And if no faint image found then power supply board would be defective and it is available with shopjimmy.com
Hope these info will help.
Thanks.

Posted on Mar 14, 2011

vrc_tech
  • 109 Answers

SOURCE: How do I determine if it a power failure or if it is a faulty SC board (TNPA5335)?

That does nost sound normal. I would take a look at the output of the power supply. Look at your electrolytic capacitors on the power supply board. Do they look like the top of them has popped up? If so you can get replacement capacitor kits from www.lcdalternatives.com

Posted on Jul 09, 2014

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Samsung UN65EH6000FXZA (Version YH02)


There is three possibilities:
1. Defective back lights LED strip.
2. Defective LED driver section integrated in the main power supply.
3. the main board.

How to check it:
1. You need a LED back lights tester to check the strips, or open the panel, use a 3.7 V DC power supply to test each LED diode separately.
2. Use a multi meter to test the out put DC voltage from the connector to the LED strip between the + & - for each section, (like 1+/1-, 2+/2- etc.) it should read 140 - 220 V DC. (need power up the TV).
3. Un-plug the cable between the main board & the power supply, power up the TV, if you get the back lights light up, the main board is bad.

Aug 11, 2017 | Samsung Televison & Video

1 Answer

I have a 2-1/2 year old LG 60LB7100 TV. When I turn the TV on I get the Lg logo and sound but then I loose picture.


The back light driver can be incorporated in either the power supply board or the main board (model specific). Contact these guys and they will make sure you get the correct part. TV Parts Universal TV Stands DLP Chips ShopJimmy

Jul 28, 2017 | LG Televison & Video

1 Answer

Vizio E420I-A0 Black Screen


Check the attached links,
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."


Vizio E470i A0 Blank Screen No Backlights How to Test Power Supply...
Testing TV Backlight LEDs
Testing tv backlight leds EsBuzz net
http://www.badcaps.net/forum/showthread.php?t=41334

Mar 10, 2016 | Vizio E420I-A0 42" LED TV 1920x1080, 120...

1 Answer

Red flashing light on 47lg50


After use Tv will not turn on


Tv will not turn on after previously being use. We will use the tv for a period of time turn it off and come back to it later in the day or night and the tv will not power on. The flashing red light on the bottom right corner will flash but it will not kick over to the blue light as it does when the tv is acting normal. Now we will wait an hour or two and the tv will turn on and work but it just starts the cycle all over again. The tv is not hot or warm or anything and does not make a noise. What can I do to fix this?
Category: I own this product
Interested in: Troubleshooting
ASKED 1 YEAR AGO User Name:
Anonymous
West Palm Beach, FL, USA
ON 47LG50 0out of 0found this question helpful. 1 ANSWER
We regret the trouble you have experienced with this television. There does seem to be a problem with the Power Supply, or one of the related components of this TV. The unit will likely require service. To make service arrangements, you may either contact our Customer Interactive Center at 800-243-0000, or you can check our Repair Provider Lookup on our website, athttp://www.lg.com/us/support/repair....

From this link.
Looking for Answers about LG Electronics 47LG50

Sep 16, 2014 | LG 47LG50 47 in. LCD HDTV

1 Answer

I have a few year old 47LG50 and the other day I turn the tv on and there was just dark color on the screen. I tried to turn the tv off from the remote and the tv power button but had to unplug the tv. It...


Good day!

That problem is usually happen when the power supply got partially defects.

Follow this simple procedure on how to repair it on your own:

  1. Open the back cover of your TV by removing all screws at the back.
  2. After you open the cover,the internal parts of TV reveal such as power supply board system board and inverter board
  3. Next,look at the power supply.It is the one that connected on the power cord and its usually compose of common parts like capacitors,resistors and power transistors with heat sink.
  4. After you found the power supply board,try to look the capacitors and see the actual appearance of it.If the capacitors looks like leak or bulge on top that is defective replace it with the same type,ratings and value.Because the leak capacitors can cause of voltage drop and power failure.Use soldering iron and soldering ****** to replace it and be careful to do that,because capacitor have a polarity (+/-) terminal.
  5. Finally,If you already replace the bad capacitors with the new one.try to plug in your TV and power it ON to test it.
I hope this solution will be helpful.Thank you and good luck.

Apr 26, 2011 | Televison & Video

3 Answers

My 47LG50 is just over 2 years old, about 30 days ago I started to lose the video/picture At first it happeded every once in a while, now it is every 5-8 minutes. I can turn it off and turn back on and it...


This problems it could be those 2 long LCD inverter boards are dead,so it is not giving ur tv LCD screen panel the backlight to produce a picture or the tv Tuner signal board itself is the problems it dead.That the board,that take in the incomming broadcasting signal wire ur case the HDMI or Component cables.Take out the incomming broadcasting signal to the tv,turn on the tv,now tv have no picture,it should have a loud white static picture noises for good more 5-8 mins,than problems it not the tv Tuner signal board.Than it is those 2 long LCD inverter boards are dead.Tries websites like Shopjimmy.com,Ebay.com to buy refurbishes 2 long inverter boards or the tv Tuner signal board for the replacement.

Mar 25, 2011 | LG 47LG50 47 in. LCD HDTV

1 Answer

Lcd has audio only no video from any input source


There are two places to look for the problems, the backlight inverter board and the power supply. Look at the power supply first since it is easier to get to, look for burnt parts, bad capacitors, etc.
http://en.wikipedia.org/wiki/Capacitor_plague
Please post back what you find.

Dec 06, 2009 | LG 47LG50 47 in. LCD HDTV

1 Answer

My 2 year old Magnavox 37MF231D/37 LCD TV just blew the picture screen. The audio comes through fine, but the screen is dead black with no menus, info, nothing. I tried various inputs, same result. I...


The problem can be in the backlight inverter board (hard to get to), or the main power supply module may not be working. Look at the power supply first since it is easy to get to, look for burnt parts, bad capacitors.
http://en.wikipedia.org/wiki/Capacitor_plague
Please

Nov 11, 2009 | Toymax Magnavox 37MF331D 37 in. LCD TV

1 Answer

Not even 2 years old and no power


no red light on tv. no power only two year old, need help.

Oct 30, 2008 | Spectroniq Protron PLTV-32 32 in. Plasma...

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Mitsubishi WS-65511 Rear Projection Big Box TV resets with a green flashing light every 5 minutes, Then works fine for 5 more minutes (perfect picture). Acts up worse when cold. Warm it up Works hours It's NOT the DM board caps. I've already replaced the DM caps twice. Not the problem. No repairman will look at the set. Too Old. So am I. I could repair it with help. The power supply must have a safety circuit that will shut down & reset if too much draw. I DON'T have a diagram. I'm not sure how to trace it . Which board? If I unplug boards one at a time, Will it damage other boards ? I know it is NOT the 7 DM board caps everyone keeps telling me. I see no burn't parts, No bulging caps. Tapping on components doesn't reset. What kind of component would act up when cold , But not overdraw when warm? This set has the best beautiful picture when it runs. If you can get past the resetting every 5 minutes for the first hour, You can watch it sometimes for 20 hours. I've left it on at night & it is still on the next morning. Change the channel Or raise the volume, And off it goes. Once or 10 times, Keeps resetting. Then on for 4 or more hours, Maybe. I can't afford a new one. It works GREAT ! when it works. I've notice that even when the set is turned off, The green light starts flashing (resetting itself while it's off) , Then stops. Once in a hundred times it will kick off the breaker & you need to push reset with a pin on the front panel next to the green light. It's probably a 10 cent resistor OR a $ 1.00 cap. If I only had someone with more knowledge than me to help. I know how to use a meter & read a schematic. I built a Heathkit 25"TV in the 70's & all my novice ham gear. I'm 64 & not familiar with digital circuits. Can someone help PLEASE ?

Dec 16, 2017 | Mitsubishi Televison & Video

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