Question about Sony 46 KDL46EX720 3D LCD TV

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Sound but no picture. No backlight present. No VLED_VCC Voltage from PSU

I have this set that has no backlight. Backlight doesn't even flicker. There is no VLED_VCC from the power supply to the Led driver PCB Is this a simple case of power supply failure? Thanks Dave

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  • Expert
  • 127 Answers

For sure is the power supply can you replace the module?

Posted on Nov 01, 2012

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Posted on Jan 02, 2017

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SOURCE: Sony Bravia 46S2010 LCD backlight ok , no video

yes it is

Posted on Jun 18, 2009

farmerbear
  • 490 Answers

SOURCE: just got home from vacation and hit the on button

Start by switching off the hard power button in back or unplugging the unit for about a minute, then replug or repower and try. This helps with a variety of power and tuner issues. Hope this helps some:)

Posted on Aug 20, 2010

Testimonial: "Thanks tons farmerbear you hit the nail on the head. No hard power button but unplugging did the trick. Thanks again, Frank"

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2 Answers

Why no backlighting on Toshiba 26AV502? - No backlighting/black screen. Audio present, no video. Trying to save older set.


Check and replace the damaged component/s at its main board. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

Sep 20, 2014 | Toshiba 26AV502U 26 in. LCD HDTV

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No picture at all on my Bravia (4yrs old) but have sound, I suspect it's a problem with the backlight.


Usually in that case the problem is the backlight.There is no supply in the backlights cause of loose connection because the backlight have high voltage.The connector of the backlights at the board or driver supply is loosen.So its better to check the connection and resolder or fix the connection.Thanks..

Aug 25, 2011 | Sony Televison & Video

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

My proview 3200 has picture but no sound


Hi gravdar4,
Power on the unit in the dark room then aim the flashlight directly to the screen, you will barely see the images. This is because your backlight is not functioning. The following reasons are the caused.
1. Power supply- missing B+(supply voltage) coming from this board feeding the inverter board. This was caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board- even the B+ was present from the power supply, if the fuse, driver transistor, driver transformer was faulty, no output to the backlight resulting to black picture.
3. Busted backlight
Diagnosing the fault istechnicaland if you don't have necessarytools and test instrumentand can't fix it yourself, I would advice you to look for anexperienced technicianto isolate the problem.
Hope I helped you.
Have a nice day!
Thanks for using Fixya.


Jun 12, 2011 | Proview PA-32JK1A 32 in. LCD Television

1 Answer

I have got an Acer3201W, It worked properly for almost 20 minutes but then suddenly switched off automatically and now though its giving sound but not picture.. All its channels are working properly and...


Hi sowaleh,
Power on the unit in the dark room then aim the flashlight directly to the screen, you will barely see the images. This is because your backlight is not functioning. The following reasons are the caused.
1. Power supply - missing B+(supply voltage) coming from this board feeding the inverter board. This was caused by faulty transistor, dried/leaky electrolytic capacitor, open fusible resistor.
2. Inverter board - even the B+ was present from the power supply, if the fuse, driver transistor, driver transformer was faulty, no output to the backlight resulting to black picture.
3. Busted backlight
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.

Jun 12, 2011 | Coby TF-TV3005 30 in. LCD TV

1 Answer

No picture but sound works


Hi ,
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.

May 09, 2011 | Protron PLTV-26 26 in. HD-Ready LCD...

1 Answer

Have sound but no picture screen is black


Hi memom440,
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 | Sanyo DP32648 32 in. LCD TV

1 Answer

Akai lct32 inch sound but picture


This failure is cause by the absence of 24 volts from the power supply to the backlight inverter board.
Defective backlight inverter board.
Defective CCFL that is inside behind the screen.
The easier way to troubleshoot it is by measuring the voltage from the power supply, if the voltage is present then the next step is to replace the backlight inverter board and lastly if the TV doesn't work; then the repair is a bit more challenging to replace the CCFL light(s).
Let me know if you require further assistance.

Aug 24, 2010 | Akai LCT3201AD 32 in. LCD Television

2 Answers

Got no picture only sound


Hello,
You most likely have a backlight issue with this TV set. Could be the inverter circuits for the backlights. The inverter is the power supply source for the backlights. there could also be a screen driver problem. This would entail changing the entire board. You should call in an authorized LG repair center to check this set out for you. Good Luck and please let me know what you found out about this TV set.

Jun 03, 2010 | Samsung LE26R73BDX 26 in. HD-Ready LCD...

1 Answer

Sound with no picture..backlight working


This failure could be due to a backlight inverter board or the power supply is not providing the 24 volts to it.
The way to fix it is by measuring the voltages from the power supply to the backlight inverter board, if the voltage is present then the backlight inverter board is defective and will need to be replace. If the voltage is lower then 20 volts, then is a power supply failure.
Click here to find the backlight inverter board.
Let me know if you need further assistance. I repair power supplies for all LCD models.

Jul 24, 2009 | ViewSonic N3251w 32 in. LCD HDTV

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