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Sanyo dp42647 42" lcd - no picture - sound ok

Tested display by placing a flashlight against screen- display is ok- backlight is not working- checked fuses on backlight board- fuse to control circut was blown- this is a smaller black 2 amp surface mount fuse, not one of the 2 large 8 amp ones. tested circut, pulling less than .5 amp- Tv works fine now. Good luck--

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6 Suggested Answers

  • 1139 Answers


I think what has happened is that your power supply malfunctioned and what has happened is that a capacitor has blown up. I would suggest that you do a complete search of the power supply to determine the location of the blown capacitor, I would advise getting a schematic to aid you in this. If you don't have experience in electronics I would also advise taking the set to the shop or calling a repairman to take care of this issue.

Posted on Sep 20, 2007

  • 71 Answers


no u cannot.

Posted on Mar 05, 2009

  • 2 Answers

SOURCE: LTV-30w2 Backlight problem...goes black

turn light in room off, take a strong flashlight and shine at an angle and see if you can see picture.If you see picture then it is inverter problem.part number 4900506280,I think.

Posted on Mar 05, 2009

  • 135 Answers

SOURCE: screen went black on my 42" sanyo model dp42647 lcd

Hi there! The panel may be in protection mode. The Inverter board is the most logical area to start after checking power supply Voltages.(5,6,24 and 13Volts). There may be coils on the Inverter Board which have bad soldering or faulty. Other than this it may be main board which controls switch on or off. If all else fails, refer to a repairer. Beware of High Current!!! Best Wishes and Good Luck, Jus004

Posted on Aug 23, 2009

  • 8457 Answers

SOURCE: Sanyo lcd tv blinking

Power supply board is dead.Replaced the power supply board will solved this problems.Tries, to buy a refurbish power supply board for the replacement.

Posted on Apr 02, 2010

  • 178 Answers

SOURCE: sanyo 42 inch lcd dp42647 - turns on, video audio pulse on off

Need s to be replaced the main board.

Posted on Apr 17, 2010

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When testin a power supply or led board on tv do i test dc or ac with multimeter?

Your power supply board is working if you get audio and imgaes.

You test AC only the AC side of the transformer before the Rectifier Diodes. Everything after the Diodes will be in DC.

did you get to see any spec of backlight as shown in
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Lg 50ln5600 backlight issue

Check whether the back-light start voltage [control voltage] comes to the backlight inverter section of the power board; from the main board. It sounds that that voltage does not come from the main board, after the firmware has been loaded up. If so the main board will have the fault. Contact any service technician.

Aug 03, 2015 | LG Flat Panel Televisions

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Blank screen on LCD TV

either the backlight power board or the power board itself isn't powering up the backlight power board

or your backlights are burnt... this is where testing comes in

Dec 30, 2013 | Flat Panel Televisions

1 Answer

Black screen, audio ok

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 11, 2011 | Samsung LE-32M61B 32 in. HDTV-Ready LCD...

2 Answers

When I turn my TV on there is sound, but, the picture vanishes after a couple of seconds. Why?

The backlight inverter is what powers the screen to "light up." You will need to check your power supply for the proper voltages going to the backlight inverter. If those all check out ok, then you need to replace your inverter to get your image back. You can find a new inverter by searching "inverter + model number of your tv.

Please rate if this helped :)

Apr 04, 2011 | LG Flat Panel Televisions

1 Answer

My Samsung LN-S2651D has suddenly lost the picture. The sound works, the remote control changes channels, etc, the lcd backlighting seems to be on, but the screen remains black with no trace of an image. ...

This sounds like the LCD Back light Inverter board has failed. The board may need to be replaced. (First check the menu option to make sure the Back-light option is not set to zero or a really low value !)
One test you can try is this.

With the set on place a bright flashlight against the screen. Look around the edge of the flashlight. You should see an image moving. You can not see the full image because the back light is off !

You can find inverter boards for your set from;
other sites by search the internet.

IF YOU KNOW HOW TO WORK WITH ELECTRONICS REPAIR( replacing board) or have a friend with knowledge/skill you can fix it.

>Unplug the set and disconnect any cables.
> Lay the set face down on a cloth covered smooth surface.

>Remove the back cover.
> Remove the metal shielding covering the board
> Disconnect the cables plugged into the board.
> Remove the screws holding the board in place.

> The new board should have the same part number as the board you are replacing.
> Install the new board with screws.
> Reconnect the cables.
> Replace the metal shielding covering the board
> Replace the back cover.

The Inverter board looks something like;

Apr 01, 2011 | Samsung LN-S2651D 26 in. LCD Television

1 Answer

Sound but no picture just 1year old

This looks like a problem with the inverter/backlight.
Turn on the set. (Take a quick look at the backlight setting in the menu just to be sure)
Take a bright flashlight and place it against the screen. Look around the edge of the flashlight for a moving image. This would indicate a bad inverter. The inverters supply voltage to the fluorescent backlight.

IF you know how to work on electronics you or a friend with knowledge/skill can replace the inverter board. You did not give a make and model so I do not know the part number.

You can look on, eBay,
for an inverter board.

Feb 14, 2011 | Flat Panel Televisions

1 Answer

Black screen, no picture, audio is OK

Place a bright flashlight against the screen. Look around the edges of the flashlight on the screen and see if you can see an image moving. This indicate the inverter/backlight has failed.
IF you know how to work on electronics or have someone with knowledge/skill you can repair/replace it.
Unplug set.
Lay on flat surface covered with a cloth.
Remove back cover.
First check to make sure the voltage is getting to the inverter board.
If the voltage is present, replace the inverter board. If not check fuse on power supply board.

Inverter board can be found on, ,, and other places on the internet.

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