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Toshiba 42 inch LCD with no picture but sound. Flashlight test shows image on screen. No backlight visible with power. Inverter board?

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City View TV & Computer, Inc.

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  • Toshiba Master
  • 450 Answers

In most of the case, the LED back lights strip is out.

Posted on Aug 29, 2017

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Jaime Hernandez

  • 2337 Answers

SOURCE: no picture

The way to isolate the failure to the power supply would be to measure the voltages going to the backlight inverter board. If all the voltages are normal then is more likely a defective backlight inverter board or LCD controller board.

Posted on Jan 05, 2009

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Anonymous

  • 66 Answers

SOURCE: Westinghouse LCD tv LTV-32W4 has great sound but no picture.

Your television actually has a backlight bulb which can be replaced at our parts request email and phone number. Email address: [email protected]. (866) 839-5888

Posted on Jul 29, 2009

Jim Krause

  • 1779 Answers

SOURCE: 47inch toshiba lcd tv (HL167) black picture, but

Best to replace both at the same time . Yes they are easy if you can find the parts.

Posted on Dec 15, 2009

Anonymous

  • 308 Answers

SOURCE: Bad backlight inverter on 42" RCA LCD

Does the backllght go out after a few seconds? Could still be a lamp or something else on the inverter boards. You could try used inverter boards from the same set with other problems (broken screen), Or a complete working backlight from another set but very delicate operation to swap the LCD display from one panel to another.

Posted on Apr 03, 2010

Anonymous

  • 68 Answers

SOURCE: DIM BACKLIGHT TOSHIBA L305D-S5924 LAPTOP

There are also another reason , the Back light lamp might be damaged also!

Posted on May 11, 2010

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2 Answers

I have a 32" Samsung LED TV with not picture. Audio is working.


Do flashlight test - if you can see image you need t con board. If no images seen, inverter board. TV Parts Universal TV Stands DLP Chips ShopJimmy

Sep 18, 2017 | Samsung Televison & Video

1 Answer

I have sound but no picture


If it's LED or LCD then it's backlights-- just shine flashlight on screen at an angle and see if you can see any movement or bring up menu display and with a flashlight you should be able to see it---as stated above---
Symptom: No picture on screen but LCD TV still has sound.
Solutions: The problem is cause by defective inverter. Replacing inverter will solve the problem---ou cannot see anything at all then it's T-Con board--

Feb 14, 2016 | JVC LT42X579 42-Inch 1080p LCD HDTV

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How do I fix my Samsung 40 LED TV that has sound but no picture?


When repairing LED TV Back light assembly you need to contact expert person because lifting of LCD TV panel is very dangerous for non technical person. Be careful

37173103-9860-4e74-ba0c-e24133de2091.jpg

Oct 15, 2015 | Samsung 40" 1080p 120Hz Slim LED Smart TV...

1 Answer

I have no picture but do have sound. VIZIO VO42L 42" screen


Hi ,
Power on the unit in the dark room then aim a bright flashlight directly to the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Aug 21, 2011 | Vizio VO42L 42 in. LCD TV

1 Answer

I have 42 inch flat screen phillips lcd tv that is 2.5 years old with no picture but has sound. Any ideas?


Hi joeflick,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Apr 26, 2011 | Televison & Video

1 Answer

I have a 42'" LCD. IT IS ABOUT 3 AND 1/2years old.


Hi evansw591,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 25, 2011 | Toshiba REGZA 42 in. Flat-Panel LCD HDTV

2 Answers

No video,screen is dark,there is audio


Hi doubles,
Power on the unit in the dark room then shine with the flashlight directly in the screen, you will barely see the images. This is because your backlight is not functioning. The following reason is the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This is caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ is good from the power supply, if the fuse, driver transistor, driver transformer is faulty no output to the backlight resulting to black picture.
3. Busted backlight - even inverter board is good but if this is busted resulting to black picture also.
Diagnosing the fault is technical and if you don't have necessary tools and test instrument and can't fix it yourself, I would advice you to look for an experienced technician to isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.

Mar 24, 2011 | LG 42PJ350 42 in. TV

2 Answers

My Westinghouse SK-32H540S pictures shuts off after 10 seconds. the sound stays on but no picture. is it the troubleshoot? i tried unpluging everything and repluging it and still the same thing happens...


This problems are the tv 1 or 2 long LCD inverter boards are dead.These 1 or 2 long LCD inverter boards provide the tv LCD screen pannel a backlight to produce a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes 1 or 2 long LCD inverter boards for the replacement.

Mar 24, 2011 | Westinghouse SK-32H540S 32 in. LCD TV

2 Answers

LCD TV PICTURE HAS GONE OFF BUT NOT SOUND?


If you've tried the backlight and brightness from the menu, you may have a more serious problem.
Try this;
Take a bright flashlight and place it against the LCD screen. See if you can see an image around the edge of the flashlight. If you see an image, you probably have one of three problems;
1) The inverter board is bad.
2) CCFT (cold cathode fluorescent light(s)) are dead
3) Power supply to inverter board is bad.

Mar 08, 2009 | Televison & Video

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