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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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Posted on Jan 02, 2017

Shuttle83
  • 1139 Answers

SOURCE: HPT-4250

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

SOURCE: DP42647 UPGRADE?

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 Shopjimmy.com,Ebay.com to buy a refurbish power supply board for the replacement.

Posted on Apr 02, 2010

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My LG tv (Model number: 32LS3410-UB) has sound, but no picture. When I do the flashlight test I can see a very dark image on the screen. Will replacing the LED driver fix this problem?


If you already tested with the flashlight which is the first step in the blank screen with sound fault then you have to test the LED Backlight supply voltages if you are familiar and good in the electronic repair. First you have to check if bulging capacitors for the LED Backlight drive voltage circuit, replace them. If capacitors are good then you have check the backlight LEDs. The flashlight test proves that the power supply is good and TV is working fine because the sound is ok and picture is fine. Attached videos and links may help you for the repair and replacement of backlight LED strips or LEDs itself depending on the type of LED strips used in your model.
https://www.youtube.com/watch?v=Z1DEkSguWtg
https://www.youtube.com/watch?v=YgaL6X6eSaU
https://www.youtube.com/watch?v=EZVQKEp6jxk
https://www.youtube.com/watch?v=T2FboV-1PJg
https://www.youtube.com/watch?v=2pyuXwNkBMA






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Sanyo DP46142 TV comes on for approximately 30 seconds and then screen goes black. Power LED stays on.


Sounds like a backlight problem to me. If you input a signal to the HDMI or Composite input and then it goes black have you tried taking a flashlight to the screen to see if the picture is still there but just dark? That would indicate a backlight issue. That model appears to be an LED edge lit backlight, so if the picture is still there after going black your going to have to trace out the backlight circuit and see whats going on. Usually with LED backlighting if it comes on at all then the LED's are good, its just the driver supply thats failing to keep them on. Some TV's have a small separate board that provides the backlight control, but i suspect with this model its on the power supply board and not the motherboard. Have you checked that board? It could be bad caps on the power supply board, check the voltages to the backlighting when it lights up and then when it goes dark. It could just be some failed capacitors on the power supply causing that voltage rail to drop off.

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I have an LG 47LN522-UB LED TV that stopped working after three years and need help diagnosing a problem with it.


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.

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1 Answer

Turned on, has sound but no picture. Why?


LCD Easy Fix (sound but no picture) - YouTube

? 4:52
https://www.youtube.com/watch?v=IBRE1Dcyxp4
Jan 13, 2012 - Uploaded by Clay Whitehead
My tv stopped working, it had the sound but no picture, so I did a little ... +ducksfans76 have you done the flashlight test? what that is is turn the tv on in a ... screen that means your backlight is out and with LCD tv's most likely is the inverter. ... Samsung Flat Screen No Picture Only Sound 002 - Duration: 1:26.

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https://www.youtube.com/watch?v=MQj2t4nNVYc
Sep 18, 2012 - Uploaded by MonkeySee
Learn how to troubleshoot your television if you've got sound but no picture. ... I have a logik lcd tv and for some reason thescreen always turns ...

Dec 25, 2015 | Sanyo Televison & Video

1 Answer

Sanyo Lcd Picture cuts out


Check your power outlet for any loose contacts. Look for any loose contacts in RC jacks/sockets/Cable. Try changing the input device to something you are sure, works such as a DVD player.

Show a torch light (flashlight) on the screen from a safe distance, when program runs. If you can see the picture, the problem is with the backlight and might require the attention of a qualified service technician.

Aug 04, 2012 | Sanyo DP42848 LCD TV

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 shopjimmy.com, http://www.tvpartsandmanuals.com/ , ebay.com, marcoselectronics.com and other places on the internet.
48.v1448.021.jpg

Feb 13, 2011 | Protron PLTV-26 26 in. HD-Ready LCD...

1 Answer

Hello everyone, My Sanyo TV lcd-32ax2 is in front of me the back panel removed and ready to be tested. I don't get any pictures or backlight but the sound work and I can change programm with the remote...


try holding a flashlight up to the screen and see if you can see the video, if you can you have a backlight problem.Can't seem to find your model number, sure it is correct.

Sep 09, 2009 | Televison & Video

1 Answer

Blank Display, using exernal monitor, can see display info w/flashlight, display flashes light at startup


You could have a defective screen - a defective inverter or a CCFL lamp.
To determine if you have a LCD screen or video card problem, read this and follow the instructions.

Defective CCFL backlight, it may have the following symptom:

  • Screen flashs on red/pink and off.
  • Picture stays on in red and slowly be come normal.
  • Picture flickering with dim display.
  • Picture flickering on and off.
All these symptoms indicate that the LCD backlight lamp (CCFL Lamp) has reached the end of the life and all you need to do is replacing the CCFL lamp

Connect an external monitor to your laptop and power it up, if you see the normal Windows images then the video card and laptop is OK and the problem is definitely the backlight.

Dim image and/or dark display on the laptop's LCD screen indicates a faulty LCD backlight and it could be the inverter that supplies high voltage to the CCFL lamp or it is the CCLF lamp is nearly burnt out or burnt out, most likely this is the case.
The inverter can be replaced easily but the CCLF lamp is more time consuming and requires soldering skills.
Check out www.lcdparts.net for parts, repair service and DIY info.

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1 Answer

Sound but no picture


check with a flashlight against the screen for picture, if present backlight inverter has failed.

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