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I have tcl 40in Md 3750 it willl not display picture . it does have backlight .I shine with flashlight But no image.I have replaced main board and t con board but no change. How do I ck screen driver

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Hitachi le55a6r9a has audio but no picture. When you shine a flashlight on the scree, you can see a dark image. Which piece needs to be replaced?


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://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.

Feb 07, 2017 | Hitachi Televison & Video

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Hi. I have a Samsung LED 46" model #UN46EH5000FXZA, with no picture but has sound.I replaced the power supply board & T-Con board & still no picture but have sound. What can I do next??


Do flashlight test to see if y0ou can see an image - if so replace the inverter board that powers backlights. If no image then go for the main board.

Aug 12, 2016 | Samsung Televison & Video

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Sound but no display


ok I have ran across this before.. First turn on the TV and go to a channel u know is good, with sound.. now turn off lights in the room.. or just darken the room.. next take a FLASHLIGHT and turn it on and shine it into the front of TV . If u see the images on the screen when moving the flashlight around. that is a good sign.. That usually means the Backlight board or boards are not working..with the TV on and in a darken room you should be able to see light coming through some of the Vent holes in the back cover, that means the Backlight board is working. from what u say I would bet on the backlight boards. pretty easy fix.. Unplug from the AC outlet. remove the back. Now be careful back there cause u can still get Zapped. I ALWAYS take pictures of the back (close up of the model and serial #'s) I take several pictures of the inside of the TV. some TV's have the Backlight board or boards on the side of the screen and some have the backlight inverter built in the main board, since u have already replace the main board u must have backlights separated. . Take close up shots of the board, and write down all the #'s from the board and when u order make sure u order the exact one..I never remove the bad board till I have the new one ready to install. I always go to ShopJimmy.com first to see if they have the part. Then I check Amazon, and then eBay. in that order.try to buy NEW boards if u can.. Hope this helps.

Mar 20, 2015 | Vizio E470VL 47 in. HD-Ready LCD TV

1 Answer

TCL LED LCD 55" - Backlight issues


Repair or replace the backlight.

Nov 24, 2013 | Televison & Video

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The t.v has sound but no picture for a while then it comes on


Sounds like a dieing capacitor or two on your main board. You could also check the capacitors on the power board, if there are two diferent power "outs" for sound, and backlight. When you first turn it on, when it has sound but no picture, shine a really bright flashlight against the screen. Is there an image there that's just not lit up? If there is, than it's simply a few capacitors on the power board. If there is NO image while there is still sound, than it may very well be your main board. It may also be the CCFL tube itself, (like the long tube lights you see in most offices) but CCFL issues are rare, and hardly ever worth replacing. (CCFL Cold Cathode Fluorescent Lamp)

Either take it to a repair shop, or send it to the manufacturer unless your comfortable replacing a few components and are handy with a soldering iron.

Jan 31, 2013 | Philips 32PFL3505D 32 in LCD TV

1 Answer

JVC tv sound but no picture


It could be a main board, but it could be a backlight problem. To verify this, turn on the set, dim the lights in the room, shine a bright flashlight on the screen. If you see a faint picture, you have a backlight problem.

Jan 09, 2013 | JVC LT-52X579 52 in. LCD TV

1 Answer

Laptop turns on but the screen displays nothing


Try using an external monitor. If it works with this, the display board may be out. If you can see the faint image shining a flashlight diagonally at the screen, the backlight is burned out. It should be practical to replace the display if it's still a good computer otherwise.

Nov 14, 2009 | Dell Inspiron 1525 Laptop Jet Black

1 Answer

Screen displays no signal after a power failure; can hear sound, no picture


It's either the backlight lamp or backlight light inverter is busted due to the power failure.Here's how to determine which is which:
  1. Grab a flashlight.
  2. Turn on the TV.
  3. Shine the flashlight onto the screen.
  4. If you cannot see any display even a faint one, the backlight inverter is dead, else the backlight lamps are busted.
  5. Replace which ever is the culprit.

Sep 25, 2009 | LG 42LC2D 42 in. LCD HDTV

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