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Hello I have a kdl52s4100 with green power on light but no picture. The first time I asked my question here I was told it was inverter boards that was wrong! I bought them and nothing. After more trou

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  • Master
  • 933 Answers

You will need to get a multimeter, and verify that you are getting 24vdc from the power supply to the inverter board(s). Then you will need to verify that the main board is putting out the "back light on" or BL_ON to the inverter boards. The BL_ON signal is usually around 3-3.5vdc. If you do not know how to use a multimeter, I would suggest you take it to a shop. Also, laying a main board or any other sensitive electronic parts on a towel isn't recommended.

Posted on Dec 13, 2012

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: Sony Grand vega 55" will blink green for three times than red

Your problem is your thermal fuse.It is located around the bottom of the compartment that houses the lamp. You will have to remove the lamp and take the bottom back panel off. Then you will have to remove the fan. I ordered the thermal fuse so I would know what I was looking for when I started to replace it. If you take your time and are patient enough you can fix it yourself. I fixed mine and it's working great.GOOD LUCK!!!

Posted on Jun 23, 2009

  • 718 Answers

SOURCE: Vizio L37hdtv10a fails to fully turn on

You will have to isolate the main board and Inverters.
Unplug the inverters and turn on the set.
If it "turns on" then try re-connecting each inverter seperately to see if only one is causing the problem.

Posted on Mar 07, 2009

  • 10 Answers

SOURCE: Sony KDL-46s2010 4 red light blinks

I would suspect one or more of the miniature flourescent backlight lamps. One way to confirm this would be to power up the set with a grayscale image at 40 to 60 IRE. If one or more lamps is failing to light, a slightly darker horizontal area in the grayscale will give it away. Unfortunately, Sony will not supply any of the backlight components apart from a new LCD panel. Sorry.

Posted on Sep 01, 2009

budmrtn
  • 11361 Answers

SOURCE: Audiovox fpe2705 inverter board replacement

You need to verify first that you do have 24vdc feeding the inverter boards, if you do have 24vdc then we can be sure it is the inverter boards. The inverter board will have very small surface mounted fuses, check for that also.

Posted on Dec 02, 2009

budmrtn
  • 11361 Answers

SOURCE: Vizio SV470XVT1A has no backlight

The 24vdc is turn on by the signal from the main logic board, it is not always on, the standby 5vdc is always on. So yes it can be the power supply board is bad, but just to besure we need to find out if it is getting the turn on signal from the main board first.
You can have 24vdc at the inverter board and it will not light up the CCFL until it gets the signal from the main logic board to turn the lamps on (this is the STANDBY condition, the TV is on but the screen in not lit up util it see the video signal).
Send me good clean and clear pictures of the power supply board, budmrtn@aol.com, connectors of the Power supply, bottom side of the board, then I may be able to tell you which pin is a control input pin. Most people will just throwing parts in and hope that they one of the parts will fix the problem. Used Power supply module for this TV is over $100. http://www.google.com/products?rlz=1T4GGIH_enUS282US283&q=delta+DPS-379AP&um=1&ie=UTF-8&ei=USsxTKn3J6TonQfFlJGEBA&sa=X&oi=product_result_group&ct=title&resnum=4&ved=0CCsQrQQwAw

http://www.shopjimmy.com/catalogsearch/result/?q=Vizio+SV470XVT+

Posted on Jul 05, 2010

Testimonial: "Bud helped me fix my TV! It was only 1 1/2 years old. I was looking at a repair bill close to $300 - $500 and I fixed it with a $60 board! Thanks!!!"

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My sony bravia turns off and on automatically and the screen has no image. the back lights are working and audio is fine. What should i do?


Fault at the back light inverter board. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced. To some models of sets, all these section circuit will be integrated at its main board. If this is the case, you have to replace the main board.

Jul 30, 2016 | Sony BRAVIA W-Series KDL-52W5100 52-Inch...

1 Answer

When I turn on the TV the green light goes green to red to green to red. If I keep turning it on and off eventually I get a picture. The picture is very dark at first


Sounds like back - light problem. Check and replace damaged component/s at its back-light inverter board, or replace this board as card basis. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. It will be best to replace the inverter board as card basis.
http://electro-medical.blogspot.com/
http://electronicshelponline.blogspot.com/
To some model sets; especially LED back-lighted types; the back-light inverter circuit will be part of the main power supply board [SMPS]. In such cases, the power supply board might need replacement. To some models sets, the back-light inverter and SMPS section circuit will be integrated at its main board itself. If so; the main board should be replaced.

Dec 26, 2015 | Akai Televison & Video

1 Answer

Klv32s310A sony bravia gets start on with green light and after a second turns to stand by mode blinking the red light 6 times after each 2 second interval


Hello Sagar,
green led means tv powered on and status ok.
Red blinking light almost always means defect, overcurrent or overload.
6 blinks for Sony lcd flat tv means trouble in backlight circuit, or backlight inverter (backlight illumination or lighting makes your tv screen visible).
common problems in the inverter circuit, which drives the backlight, or shorted drivers, or short-circuit transformers or open circuits.
You should find the problem in the inverter circuit, or in the power supply board or in the main board.
Also look for bad capacitors (electrolytic caps) which are bulged and swollen on top.
Decoupling plugs from printed circuit boards can help you in finding the problem board by elimination method.
If you power up the set after unplugging certain plugs on f.e. the inverter board , this could result in getting a green power led and concluding that this board is faulty.

succes,
Walter from Antwerp, Belgium.

Dec 30, 2014 | Sony Televison & Video

1 Answer

I own a sanyo "26


Tv now have it on green LED power on for good and tv flashes of pictures only for few min,than dies and have sound left only?Yes,take the tv aparts.U have all the tools and understanding basic electronic also can do basic soldering work too?Check the tv power supply board,that the board where the power a/c cord plug into it.Check the tv power supply board carefully for dead and dying components parts call capacitors.These dying and dead capacitors parts most likely all of the times,will bulges up or puffing up onto it tops.Changes all these dying and dead capacitors parts components,will solved this problems 70% of the times.If the tv power supply board it is good and no dying or dead capacitors component at all.Than the tv a long board that call the LCD inverter board it is dead.This LCD inverter long board are to helping the LCD screen panel to have a backlight to produced a picture.The tv long LCD inverter board have no parts for sale indivitually,al way have to buy a refurbish whole long LCD inverter board for the replacement.Also if you have no tools and soldering skills to fixed the power supply board by replacing capacitors component parts indivitually too.Tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board or a long LCD inverter board for the replacement.

May 28, 2011 | Sanyo DP26649 26 in. TV

1 Answer

I turned my t.v. on w/the remote. it came on then turned right off. at least i thought it did. there was no picture and the power light was blinking on and off with a green light. I pushed the power button...


Hello; This problem is likely caused by bad inverter board(s). I think there are 2 on the left side on this model. If either inverter doesn't start, the microcomputer on the main board see's this and generates one "lamp error" . Once it counts 5 lamp errors, the screen will not light and led(s) will flash. These boards are about $100 each and no way to know which is bad. It can also be caused by a bad LCD panel ( cost more than the TV sold for). You can verify a lamp error problem by doing a "forced start" . The set must be unplugged. then"I think" Hold the channel up and volume down buttons on the set or VISa Versa, and plug in without releasing these buttons for several seconds. If the set makes a buzzing noise , the power supply board is bad. If the set comes on and stays or goes off this is the inverter and/ or LCD panel problem. John

Dec 10, 2010 | Sharp LC-32SB24U 32 in. LCD TV

1 Answer

I have a Sony KDL52S4100 LCD television. The power light is on but no picture is displayed and not powering on


When you say the power light is on but it is not powering up, what do you mean by that (just that there is no picture)?

Sounds like the inverter has died or the backlight bulb. Either way, it needs a techy to fix.

Oct 07, 2010 | Sony BRAVIA KDL-52S4100 52 in. HDTV LCD

1 Answer

MY L37WD12 STARTED NOT ALLOWING CONTROLS TO WORK ON TV OR REMOTE. THEN NO VIDEO, NOW NO POWER UP. RED LIGHT IS ON.


Hello,
You have to open the back cover of the television to check for bulged capacitors, if found replace with the same rating of the capacitors, but otherwise.
Also note that
If the green light comes on and blinks when the remote is touched it was never a issue with the mainboard, if it was you wouldnt have any signs of power. In most lcd tvs you have the main board which is normally the power board, the signal board which recieves signal and hold settings of the tv which can be all in one, the other is the inverter board, which scrambles the signal to what you see on the screen, and next we have the back light which lights the screen so you can see the picture, sometimes in certain models as i have learned you can have power/inverter boards which means the inverter and power are all on the same board, in your case i pressume the inverter board is seperate board and probably the issue you need to address, you can try website Shopjimmy.com,Ebay.com to buy a refurbish board for the replacement.
.
Hope this helps




Jul 30, 2010 | RCA L37WD12 37 in. LCD HDTV

1 Answer

47LC7DF, Green light comes on, blinks with remote


When you say that you have replaced the main board i assume you mean the power board? If the green light comes on and blinks when the remote is touched it was never a issue with the mainboard, if it was you wouldnt have any signs of power. In most lcd tvs you have the main board which is normally the power board, the signal board which recieves signal and hold settings of the tv which can be all in one, the other is the inverter board, which scrambles the signal to what you see on the screen, and next we have the back light which lights the screen so you can see the picture, sometimes in certain models as i have learned you can have power/inverter boards which means the inverter and power are all on the same board, in your case i pressume the inverter board is seperate board and probably the issue you need to address, you can buy these online probably the same place you got your new mainboard from. Hope this helps pls post bach what happens.

Feb 01, 2010 | LG 47LC7DF 47 in. LCD HDTV

1 Answer

Green power light on no sound or picture cycles


MAYBE INVERTER BOARD BAD..
INVERTER BOARD IS A PART OF THE LCD PANEL UNIT

Sep 28, 2009 | Sharp LC-32SH12U TV

1 Answer

Phillip tv


Probably bad inverter board. It has a short in inverter board and as soon as it powers up it detects the excessive current draw and shuts the set back off. Open it up, unplug the power supply connections to the inverter board then try to turn it on, if you get a green light then the inverter is bad. Try E-bay for replacement board.

Apr 16, 2008 | Philips 26MD255V 26 in. LCD TV/DVD Combo

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