Question about IBM ThinkPad T43 Notebook

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T43 backlight problem, changed inverter, problem still there. Can see faded images on screen.

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Its either going to be an LCD problem or in a rare case it could be a bad lcd connector on the motherboard meaning that it may not be able to process the voltage that the lcd is putting out. Try hooking up a known good working lcd and if you get normal video then your other lcd is bad. If you still get a dim screen with the known good working lcd then the motherboard is bad.

Posted on Jun 04, 2009

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My t43 hasnt been used in about a year because it needed a new heatsink (fan error when turned on). i replaced the heatsink/fan assembly and now the screen is black when the laptop is turned on and nothing...


Watch the screen at an angle during boot (image content varies) to see if you can detect any changes of a 'ghost' image.If so, then the video section is working OK but then the backlight has been disturbed and disabled.You may have bumped a connector that connects the main board to the display section.
If you cannot find anything suspicious with the connectors, either the backlight itself or the inverter board has failed; I checked but could not determine if the screen has LED backlighting so it will be a fluorescent and inverter combination.The high voltage inverter is often on a separate, very narrow board since these are mostly out-sourced from another company; TDK is a major player in the manufacture of these inverters and they are generally available and can be found on eBay.

Mar 01, 2012 | IBM ThinkPad T43 Notebook

1 Answer

How can I fix a 42lg20-um with a faded screen?


The faded screen(if you mean faint image) is due to failed backlight inverter board. THe backlight is sealed behind the LCD paneland lights up the image . Replacing the inverter board should resolve the problem. In sets of this size there are usually master and slave inverters. Let me know if you wish to fix it yourself so that I can give you the instructions.

Sai.

Apr 27, 2011 | LG Televison & Video

1 Answer

I have a CTX s761 lcd monitor. The image on the screen will be clear for about a minute, then it gets very dark and can only see a ghost of the image. Power off and back on and it does the same thing...


It's a backlight issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) With a bad backlight, you'll usually see a very dim image if you look at the monitor from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something).

The backlights are sandwiched on the perimeter of the monitor (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your monitor size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx . lcdparts.net sells backlights for some laptops and monitors. There are other sources.

The inverter board or the video board can also fail but you usually won't see any image when those fail. For an out of warranty monitor, open up the back of the unit and remove the shielding. Then look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the monitor. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

With a good spare backlight, you can test an inverter for condition (plug together and turn on the monitor while the box is open). Similarly a good inverter can test the backlight. If the inverter or video board is bad, you will see nothing

I hope this helps.

Cindy Wells

Jul 27, 2010 | Computers & Internet

1 Answer

Dynex dx-l40-10a flat-screen hdtv turns on and the screen is viewable for a second then goes black. And power light is still on


It's a backlight or backlight inverter issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight. With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing

I hope this helps.

Cindy Wells

Jul 21, 2010 | Dynex DX-L42-10A 42 in. LCD TV

2 Answers

I was watching tv and the screen went black sound is still on but if i turn off and on i have no screen but still sound


It's probably a backlight or backlight inverter issue. (The backlight itself usually fades or makes the on-screen image change to pink/red.) For an out-of-warranty TV, open up the back of the TV and remove the shielding. Look for any scorch marks or bulging or damaged capacitors. (Sometimes other parts will fail on this part but these can be spotted easily. Capacitors look like cylinders on a tripod.)

If you borrow (or have a) high-end multimeter (able to measure high frequencies - 50 kHz) or an oscilloscope, hold the multimeter probes a fraction of an inch apart about an inch above the board and power up the TV. If you see a 1 or an actual value, you have a good inverter. If you see a reading near 0, the board is bad or the multimeter can't resolve the frequency.

In either case, you can buy a replacement inverter for $50-150 and just do a simple swap. Disconnect all of the wires (connections are similar to molex and ribbon cables in a computer) and remove board (a few screws usually). Connect the cables to the new inverter. (If you google backlight inverter replacement, you'll find videos and text descriptions.) Note the part number on the board, including the Rev number, and order the exact one (shopjimmy.com or lcdparts.net are good starting points). Universal inverters do exist but can result in reversed controls (up to lower the brightness). Replacing individual parts on the board is cheaper but more prone to not tracking down all of the bad parts.

If the inverter is good, then it's probably backlights themselves (several in most TVs). These are sandwiched on the perimeter of the TV (usually under some tape that holds the lamp, reflector and other parts together. You need to order by length and width and get ones for your TV size. Remove the tape, and separate the reflector (make a note of how things are put together) then you have to Dremel (or use another rotary tool) to remove the plastic to get the backlight out. (They are often molded into the frame.) Then put in the new backlight and reassemble everything. (http://www.lcdparts.net/howto/default.aspx) but for an overview: http://www.inventgeek.com/Projects/BacklightFix/overview.aspx

With a good spare backlight, you can test an inverter for condition (plug together and turn on the tv while the box is open). Similarly a good inverter can test the backlight. With a bad backlight, you'll usually see a very dim image if you look at the TV from an inch from the screen. Block the room light from overwhelming this image (sometimes a carefully positioned flashlight will help you see something). If the inverter or video board is bad, you will see nothing

I hope this helps.

Cindy Wells

Jul 14, 2010 | Sanyo DP32746 32 in. LCD Television

1 Answer

Monitor on a emachine 250 computer comes on picture is very light faded in the background but no light


This is a typical symptom of a failing LCD screen inverter board or LCD screen backlight lamp. The backlight lamp failure symptoms are very similar to the inverter board failure symptoms. If you have to guess which one is causing the problem, try replacing the inverter board first. LCD screen inverter boards fail more often than the LCD screen backlight lamps.

Feb 16, 2010 | Acer Computers & Internet

1 Answer

IBM T43 laptop display


This is an example of an inverter going out slowly. Usually, they tend to just go out and you diagnosed correctly when you seen the faintness on the screen and tested with another monitor.

The Dell inverter will not fit, more than likely. They are all different sizes, lengths, etc.

I would recommend just replacing the screen of the Toshiba. You can get one for less that $50.00 on eBay and it will save you alot of hassle trying to swap out the inverter (my opinion).

Oct 04, 2009 | IBM ThinkPad T43 Notebook

1 Answer

Monitor


You could have a faulty inverter, To determine if you have a LCD screen, inverter or video card problem, read this and follow these 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 or appear black. 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 the monitor up first then the laptop, 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.

Jun 25, 2009 | Acer Aspire One PC Notebook

1 Answer

Ibm thinkpad t43 backlight inverter issue


Did you say the the video output flickers on and off when you connect an external monitor to the video output. If the inverter is faulty this would not affect the video output and the external monitor would not flicker but if the external monitor flickers it would point to a video card problem.

Jun 13, 2009 | IBM ThinkPad T43 Notebook

1 Answer

T43 - No image on LCD, backlight ON, LCD known to be GOOD.


Is the video input to the back of the panel securely in? The two computers might now use the same inverter though. It is probably the same, but hard to know.

Jun 12, 2009 | IBM ThinkPad T41 Notebook

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