Question about Toshiba Satellite M40-S417TD Notebook

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FL Inverter Board adjustment

I had problems with my inverter board and had replaced it myself. It works only marginally better but seems to still turn off whenever I crank up the contrast too high. I noticed a small potentiometer on the board though and am wondering if it can be adjusted to prevent this from happening or if it shouldn't be touched at all?

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Dear User, I would suggest not to tampering with your lcd inverter potentiometer, as it control the amount of voltage being use by the lcd montior. As you have seen from earlier event, it turns off once it reach a certain point. In which, whats really happen is that its reaching a certain temperature and voltage, to which it's shut off to save it's self from burning out. It can also be the lcd inverter was set wrong from the manufacture, and turns off just like before.

Posted on Jul 19, 2007

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Posted on Jan 02, 2017

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Sony Bravia KDL-40EX500. Plugged in power and no backlight. No pic no sound. Could it be the power board or inverter board? How can I test these boards? Thanks.


SELF DIAGNOSIS FUNCTION
The units in this manual contain a self-diagnostic function. If an error occurs, the STANDBY LED will automatically begin to fl ash. The number
of times the LED fl ashes translates to a probable source of the problem. A defi nition of the STANDBY LED fl ash indicators is listed in the
instruction manual for the user's knowledge and reference. If an error symptom cannot be reproduced, the remote commander can be used to
review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.
DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY LED will fl ash a set number of times to indicate the possible cause of the problem. If there is more than
one error, the LED will identify the fi rst of the problem areas.
Result for all of the following diagnostic items are displayed on screen.
If the screen displays a "0", no error has occurred .
Diagnostic Item
Description
Number of times Standby
LED blinks Possible Location
Main Power Error 2 G2HE/GD2 (Power) Board
Audio Error 3 A (Main) Board
Balancer 4
LCD Panel
Inverter Board (ETC-Inverter MT Board) for 32" & 40" Models
TCON Error
5
LCD Panel
TCON Control MT Board
HFR Error 5 LCD Panel
Backlight Error 6
LCD Panel
Inverter Board (ETC-Inverter MT Board) for 32" & 40" Models
Temperature Error 7 A (Main) Board

This should help you narrow it down. I am also attaching the service manual for you. https://files.acrobat.com/a/preview/16a56e45-a439-48bc-8770-21638f2bab68

Jul 04, 2016 | Sony Bravia Kdl-40ex500 Series 40-inch Lcd...

1 Answer

Toshiba 32 inch LCD. The picture comes on but very fade. I tried different wires and also adjusted settings,  nothing seems to work.  Any suggestions?


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.

Nov 12, 2015 | Toshiba Televison & Video

1 Answer

How to replace inverter boards


Carefully lift up the FL inverter and rotate it a little bit. Unplug cables on both sides. The left side of the inverter board connects to the video cable, the right side to the backlight bulb (CCFL tube) inside the LCD screen. Remove the inverter and replace it with a new one

Sep 11, 2015 | Televison & Video

2 Answers

Why are all the lights on LCD screen on?


How to troubleshoot and fix video problems
Here are some tips and tricks for troubleshooting and fixing laptop video problems. Video issues are very common within portable computers and with the following tips you should be able to detect and eliminate basic laptop video problems.
Laptop LCD screen has a faint image.


all-lights-lcd-screen-4ztirbadqll2ypvmakqp10pq-2-0.jpg
Look at the LCD screen very closely and check if you can see a faint image on the screen. It's possible that the LCD lid close switch stuck in the "closed" position and the backlight stays off even when you open the LCD screen or turn on the laptop. The switch turns off the backlight when you close the LCD display to save the laptop battery power. Check the LCD lid close switch. Usually it is a small plastic pin located close to the LCD hinges. Try to tap on the switch a few times to turn on the backlight. If after tapping on the LCD lid close switch the backlight stays on, you fixed the problem.
It is also possible that after tapping on the LCD lid close switch the backlight works fine, you see a normal video on the screen for some time and then the backlight turns itself off again. In this case I would blame the FL inverter board. Try to reseat cables on both end of the FL inverter to make a better contact between the cables and the FL inverter board. If it doesn't help I would try to replace the FL inverter board.
Laptop LCD screen is solid white color.


http://www.laptoprepair101.com/wp-images/white-screen/1-laptop-white-screen.jpg
Most likely it is just a bad connection between the LCD display and the system board. I would try reseating the video cable connector on the back of the LCD screen first and check if it fixes the problem. After that I would try reseating the video cable connector on the system board. I would also try reseating cables if there is no video on the LCD screen at all.

http://www.laptoprepair101.com/wp-images/bad-laptop-video/washed-lcd-image-1.jpg
Try to connect the LCD screen to an external monitor. If the external video is fine, you have a problem with the LCD screen or the LCD video cable. You can try to fix the problem by reseating the video cable on the back of the LCD and on the system board.
If you see the same garbled video output on the external monitor most likely it is not the LCD screen problem. In this case the system board (with onboard video) is bad or the video card is bad.
REFERENCE: http://www.laptoprepair101.com/troubleshoot-fix-laptop-video-problems/
GOOD LUCK.

Jun 30, 2015 | Computers & Internet

1 Answer

My acer screen is just blank i think it took a knock is there a quick fix


You may have cracked or broken the FL tube (backlight) or the inverter board has failed.
If the tube is broken, it needs to be replaced (or you can replace the whole LCD if you find one cheap).
If it's the inverter board, look for a microfuse on the inverter board (the one connected to the FL tube). These fuses will sometimes go for no reason. Check it for continuity with an ohm meter.
If the fuse is good, you may need to get the inverter board replaced.

To find out if you damaged the fl tube, you have to open up the LCD panel.
This is not a job for the faint of heart, and you have to be really careful not to damage anything.
They usually shatter when they break too, so be careful there.
You may just want to tap the backlight area to see if you hear rattling glass.

Check for loose or dislodged cables while you're in there.

Mar 22, 2011 | Acer Aspire Notebook

1 Answer

I have no picture on my Sanyo Dp32746 LCD tv, the audio works fine. I replaced the backlight inverter board, but still no picture. Tried the reset button on the remote, can not see the main menu to try to...


U replaced the 1 or 2 LCD inverter long boards,still the same problems.Sorry,this is a rare problems,but it seem the Tuner board is the problems.Replaced the Tuner board,will solved this problems.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish Tuner signal board for the replacement.

Oct 08, 2010 | Sanyo DP32746 32 in. LCD Television

3 Answers

Turn on laptop, loads fine, screen comes up, then screen goes black. computer is still running and you can see it if you put a flashlight on, but screen remains black.


Try to adjust the back-light on the screen by pressing the FN and UP arrow to increase the light.

If that does not work then it means that your back-light on the screen has either failed completely of works for a couple of minutes and then it goes off. You need to have your screen replaced with a new one.


Sorry for the bad news.

Sep 21, 2010 | Dell Latitude D600 Notebook

2 Answers

A105 LCD problem


I don't know where this thread was originated, but your laptop has only one inverter board.

The inverter is a small board that powers the AC lamp that provides backlight to LCD.

Here is the spare:

Toshiba LCD Inverter Board M110 A105 A100 ...

See here Toshiba Satellite A105. How to remove and replace laptop FL

Dec 29, 2008 | Toshiba Satellite A105 Notebook

2 Answers

I turn on my computer but the screen is still black


think you might have a failed screen inverter (FL inverter); this problem is very common with laptops. The inverter board acts as a power supply for the LCD screen backlight bulb, it converts low voltage DC power into high voltage AC. On most laptops the inverter board is located inside the display assembly below the LCD screen and you can get access to it if you remove the screen bezel (LCD mask). When the screen inverter goes bad the backlight will not turn on anymore or it turns on for a short time and then goes off, but you still can see a faint image on the screen and the external monitor works just fine. First of all I would make sure it’s not just a loose connection and reseat connectors on the inverter (it looks like you already done this part). Next, I would try replacing the inverter board. It might fix your problem with the backlight. It’s possible that you have a faulty cable, bad motherboard or even bad LCD screen, but I would try replacing the screen inverter first.

Oct 06, 2008 | Toshiba Satellite Pro 4600 Notebook

4 Answers

Monitor turns off after two seconds


Your inverter board is bad. They run anywhere from $30 - $80. They are very easy to replace. I have had this problem with three monitors and replacing the inverter board fixed the problem. Hard to say where you will find the part. Just do a search for 'inverter board' with your model # on any search engine.
Good Luck!

Oct 23, 2007 | CTX S762A 17" LCD Monitor

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