I have a IBM T43 laptop. It has been running very good until a few days ago, when the lcd monitor only turns on intermittently. I had a broken left hinge. So I doubted that the connection of cables may be the cause of problem. So I ripped apart the monitor but find all connections to be fine.
Now paying more attention, I found that monitor does turn on most of the time, although very fainted, which seems to be a backlight problem. But shouldn't it never turn on if it's bad backlight? I still have a good clear display maybe one-out-of ten turn-ons. Also, if it is a bad inverter backlight combo, can I use my Dell inspiron 6000 inverter-backlight combo to replace? They look very alike. Thank you!
When I connect this to an external monitor and select bios option to display to LCD+VGA or VGA only (I forgot which exactly it is), external monitor images trembles. Anytime I was able to get display on both monitors, the external monitor image does not tremble.
I know this is not a video card issue since I connected this same lcd display to another ripped-open IBM laptop and this problem persists.
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A Thermal error on the T43 usually indicates a problem with overheating. This can be caused by many reasons:
1. Dirt build up on fan or fan louvres causing fan to turn slowly and not being able to cool the system properly.
2. Blocking of air inlets to the laptop. Do not use on your lap, or on soft surfaces such as blankets, bedsheets, etc.
If you feel a lot of heat from the air out of the laptop, then the system is over heating.
You can run fan diagnostics as follows:
1. Turn on the computer and check the air turbulence at the louver near the PC Card slot.
2. Run Diagnostics --> ThinkPad Devices --> Fan.
Here is the T43 maintenance manual to see how to check and or replace the fan.
Do a google search for: ibm thinkpad t43 drivers and it should bring up links to the ibm support/download site. Just make sure you know what OS you are running when you find the driver you are looking for. I had to do this for my t43 not too long ago after a hard drive replacement.
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.
The backlight is the light bult that illuminates the screen. Before it finally goes out completely it will turn your screen a pink color on startup (and then usually become brighter and the pink fades). It is also possible that the backlight, also called a Cold Cathode Flourescent Light, CCFL, died an immediate death. But usually they take a while and signal with the "PINKNESS" first. If you found that your computer is working just fine connected to an external monitor (and you moved the base of your laptop around while connected to the monitor to be sure and left the computer on for a long time) then you have verified that the screen is the problem. It is usually two things: (1) the inverter, a circuit board that increases the voltage to supply the LCD which eats around 700 volts (yeah baby); or (2) the backlight itself. The first problem is a relatively easy and inexpensive fix. You can find how to replace an inverter by downloading the Hardware Maintenance Manual for the T40, T41, etc., from IBM/Lenovo's site. Replacing the backlight itself, a bulb that is like a strand of speghetti and even more delicate, is a tougher job. I would suggest purchasing a replacement screen in that event rather than replacing the backlight yourself. (The HMM probably does not show you how to replace the backlight/CCFL as it is a potentially dangerous job.) That suggestion assumes you can find a cost-effective replacement screen and do not mind opening the TP and putting the new screen in. At least look at the HMM to see what is involved. Good luck.
I'd do a few things. Reseat the RAM, this is easy and could be messed up..
I'm worried that there was a short or some other issue that damaged a component on the main board. I'd try to follow the Power On Self Test (POST) error codes from above, or google it more to see if you can find your exact symptom. If you are still getting beeps, you should be able to determine exactly what is wrong.
have you tried Function F7/F8 ?
Make sure that your display driver is installed correctly.
I had the same Laptop as you did and was able to have dual monitor.
Also check your Display driver in your control panel and make sure it set to dual monitor.