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Model 40G300U1 TV. Just installed new backlight inverter. Why is there a picture on the right half of the screen while the left side is still dark?

The screen was completely black, but I could see picture when using a flashlight. I purchased a Backlight Inverter (I believe it was a used inverter that was repaired and tested), but it only fixed half the screen. Is it a defective (new) inverter, or something else?

Posted by Jake Shirbroun on

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5 Related Answers

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

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Anonymous

  • 56 Answers

SOURCE: Hp dv1000 no backlight, repalced inverter, still no screen

plug in a monitor in the side of the laptop if it shows up then the lcd is bad. Also try and reset the memory by pulling it out and then put it back in if not in all the wall nothing will appear on the LCD.

Posted on Jan 27, 2010

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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

  • 1 Answer

SOURCE: Dark area on left side of screen of Dell Inspiron 1525

ok , i have had this problem on bolth my dell inspiron laptops , on a 6400 and a 1525 . the 6400 had the lower left corner all dark and the 1525 was split right down the center . i fix bolth of em in a really simple way , turn on ur pc and go into windows , press the blue Fn button and the down arrow untill ur brightness from ur backlight is completely down . keep it that way with the screen on with a screen saver for about one hour then turn brightness back up but not all the way up cuz in my case the problem hapened again , but when i keep it just one click darker , boom problem fixed . from what i can figuere out is that the inverter aint powerfull enought to power the backlight and tends to over heat , so keeping the backlight a bit lower tend the keep em ok

Posted on May 22, 2010

Anonymous

  • 14 Answers

SOURCE: I have a Philips 42PFL7422D

There are only two boards. Master - 6632L-0470A REV 1.3 and Slave - 6632L-0471A Rev 1.3

Posted on Mar 21, 2011

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TCL L46E5300F flatscreen half right side screen is darker than left side


If it is an LED LCD TV, the backlight inverter board should be troubleshooted. Contact any service technician.

Jan 09, 2014 | Vizio VW46LFHDTV10A 46 in. LCD TV

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HELP! Olevia lt37hvs screen went blank. No Sound, panel buttons wont work. Backlight is only on on half of screen.


if you had audio i wold say its most likely the Tconn or its upper two connections to the Panel itself. But since you dont have any sound either I would assume its either the LVDS cable from the main board to the Tconn or the Main board itself as audio and video are produced on the main board, You can get replacement boards from www.tvrepairworld.com

Aug 12, 2012 | Olevia LT37HVS 37 in. LCD HDTV

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Left side is dark and right side is good


The LCD sets use backlights and also a pair (some models combine both into one unit) of inverters- one drives left side and the other right side.

You could have a bad inverter (some versions call it T-con) or even a bad display panel(main screen unit).

In most cases this is not a do it yourself repair.

May 17, 2012 | Sony Bravia KDL-46V4100 46 in. LCD HDTV

1 Answer

Qosimo e15 av101 back light is dim how do I fix it


swaffordrand,

An LCD screen cannot produce light. It needs an additional light source.
A Backlight is the additional light source.

A Backlight is a CCFL or a series of LED lights, (For present technology)

The Toshiba Qosmio E15-AV101 uses a CCFL.
Cold Cathode Fluorescent Lamp.

Similar to Fluorescent lighting used in homes, and businesses, but on a MUCH smaller scale.
(Usually 2mm Wide, by close to the height of the LCD screen, Long )

A screen Inverter is used to convert the power (Electricity) of the laptop, for the Backlight, and LCD screen.

90 PERCENT OF THE TIME the fault is the screen Inverter.

http://www.pelltechnology.com/Toshiba/Laptop/Toshiba-Portables-Qosmio-E15-Series/AV101/Toshiba-Qosmio-E15-AV101-Backlight-Power-Inverter.html

The front thin plastic frame in front of the LCD screen, is the Display Bezel.
Resembles a picture frame in it's design.

Toshiba's name is Display Mask.

The screen Inverter is located behind the Display Mask, and mounted at an area below the LCD screen.

A) Remove ALL power. Remove the AC adapter (Charger) and Battery.

B) It would be best to buy, and wear an ESD wrist strap. Average cost is around $3 to $6. (Electro Static Discharge}
Connect it's alligator clip to a good ground source.

One example,

http://www.radioshack.com/product/index.jsp?productId=2103245

Your body carries Static electricity. Static WILL fry out (Short Circuit) the delicate hardware components inside a computer. The ESD wrist strap prevents that.

It is arguable that you are just replacing a screen Inverter, and the above is 'over-kill'.
I would rather spend $6, and not have to worry that I could accidentally make my laptop an expensive paperweight, or doorstop.

Use a multi-compartment container for the various screws you will remove. SOME screws look VERY similar to other screws.

DO NOT mix them up.

C) Open the laptop, lay the Display Assembly all the way back. (Down)
Pull up on the right Hinge Cover, and remove it. Do the same for the left Hinge Cover.

To the immediate right of the right Hinge Cover, and immediate left of the left Hinge Cover, are two Philips head screws to remove.
These screw heads are covered by a piece of masking tape.

The tape is carefully removed, (May be able to use it again), and the two screws removed.

The Display Mask is very thin, therefore quite flexible.
The mask has plastic tabs that protrude from the outside edges.
There are matching tabs on the Display Cover.

(Display Cover: Plastic top cover of the laptop. Covers the LCD screen)

The Display Mask tabs snap into the Display Cover.

Go to either the Left side, or Right side of the Display Mask.
Go to the inside middle edge.
Halfway between the top and bottom of the Display Mask, and to the inside edge against the LCD screen.

Use a soft cloth laid on the LCD screen to protect it, and use a finger to gently start lifting on the middle/inside edge of the Display Mask.
(Cloth is to protect LCD screen from your fingernail)

With the Display Mask lifted in the middle, the width of a fingertip, ease another finger beside it. Start moving away from the first finger, and lifting up on the Display Mask.

The tabs of the Display Mask will start 'popping' out of the Display Cover.
Go around to the top of the Display Mask, and head towards the opposite side.

Once the Display Mask is halfway popped loose, the rest of the mask should come free.
Note that you have to slide the mask over to the Left, to clear the Latch, when removing the mask.

You will now see the screen Inverter,mounted to an area at the bottom of the LCD screen.

Unplug the cables from the Left, and Right side of the screen Inverter.
Note that the connectors on the cables are different, and can't be mixed up, as to where they plug in.

Remove the single Philips head screw from the bottom/middle of the screen Inverter.

Test the screen Inverter before removing;
This requires a sensitive (Read fairly expensive) multimeter,

http://www.fonerbooks.com/test.htm

Due to;
A) Low Cost,
B) Ease of access,
C) No tool available to test,
D) 90 percent of the time the fault is the Inverter,
the screen Inverter is usually replaced by the consumer.

Backlight:

If the screen Inverter proves to Not be the problem;

http://www.pelltechnology.com/Toshiba/Laptop/Toshiba-Portables-Qosmio-E15-Series/AV101/Toshiba-Qosmio-E15-AV101-CCFL-Backlight-Bulb-for-LCD.html

Replacing is a procedure that is fairly intensive, even for an experienced tech.

Why?
The LCD screen (Toshiba = LCD Module) is composed of many layers.
These layers are set in a specific pattern by the factory.

The layers are held in place by a Screen Frame. A thin metal frame that resembles a picture frame. (Toshiba = P-Chassis )

Part of the screen frame is removed. The screen frame Bezel.
(P-Chassis Bezel)

[ The P-Chassis, or screen frame, is composed of TWO parts. The lower main half which is the P-Chassis, and a thin upper half which is the screen frame Bezel, or P-Chassis Bezel.

This will all make more sense when you view it in the Service Manual, on Page 281 ]

Anti-Static computer gloves are usually worn to prevent soiling the LCD Panel, (LCD screen)
(Soiling = Oil from your fingers, dirt, and also helps prevent scratching the LCD screen )

There is a panel, or Board, that goes across the top. Three screws are removed. Then open the bent portion of the TCP of the board, and remove the Backlight.

The Display Assembly needs to be removed from the laptop, in order to perform replacing the Backlight lamp. (Bulb)

General example,

http://www.ccfldirect.com/lcdtutorial.html


Another one,

http://www.laptoprepair101.com/laptop/2007/12/09/replace-laptop-backlight-ccfl-lamp/

Service Manual link to be included in a Comment, along with more pictorial information.

Regards,
joecoolvette

Feb 25, 2012 | Toshiba Computers & Internet

1 Answer

I have a vizio 46 in lcd model # VW46L FHDTV10A and it started with the whole left side going dark and then it would get better after an hour or two. then about a week later the entire left side of the...


I would suspect the backlight inverter is faulty:

I would try to look on the power supply first for popped capacitors that supply the 24v rail for the backlight inverter.

Having sound is a positive when it comes to repair. This means that only your screen is not lighting.

If you repair the 24v line and check the 5v feed also going to the BN_on (on) the backlight inverter and you still have no picture...you will need a new inverter.

This could also be the CCFL bulbs that are aging and need replacement. Those are around $20 each for a bulb

Hope this helps! Please rate :)

Mar 14, 2011 | Vizio VW46LFHDTV10A 46 in. LCD TV

4 Answers

Half screen is blank 42lg20 or 42lg50 when


This is likely to be the T-con board. If the entire screen glows but you have no picture on the second half of the screen then it is the main board, not the backlight inverter. If the screen is half picture and half gray it is the T-con board.


Replacement of one of the above will fix the issue.


Please rate if this helped :)

Mar 07, 2011 | LG 42LC2D 42 in. LCD HDTV

1 Answer

Picture went black. Have sound but no picture


Tv turn on now,u only have a flashes of a picture for a few sec. than died have sound left ony?Yes,the tv have 2 long boards call the LCD inverter boards,one on it left and one on it right sides.These 2 long LCD inverter boards are dead.These 2 long LCD inverter boards help the LCD picture screen panel to have a backlight to produced a picture.Tries websites like Shopjimmy.com,Ebay.com to buy those refurbishes 2 long LCD inverter boards for the replacement.

Nov 25, 2010 | Insignia 42" LCD Flat-Panel HDTV

2 Answers

Picture screen fades to very dark (almost black) beginning at about 2/3 from right to left. Right 1/3 of the screen has great picture. Have up loaded the latest driver.


DO NOT trash your TV!
It is nod panel bad, TV has bad Backlight Inverter Modules!
They come as a Kit and guy at
[email protected] has them for decent price.
Also he will give you full tech assistance if needed.

Aug 10, 2010 | Philips 47PFL7422D/37 Television

1 Answer

One day old samsung 40LC530 LCD tv shows a dark patched screen


that is a factory defect you call the dealer for the warranty.the defective part of your tv is the inverter board.this board supplies high voltage supply to the backlight cold cathode flourescent lamp.This lamp is the one illuminating the screen of the tv..the lamp is installed at the top and bottom of the screen thats why the center of the tv is dark because the lamp does not lit well..tnx

hope i help you
please rate my help..

Jun 05, 2010 | Televison & Video

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