Question about IBM ThinkPad T43 Notebook

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IBM T43 laptop display

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.

Please help! Thanks a lot!

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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).

Posted on Oct 04, 2009

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A Thermal error on the T43 usually indicates a problem with overheating. This can be caused by many reasons:
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Here is the T43 maintenance manual to see how to check and or replace the fan.

http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/39t6193.pdf

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Here is a page talking about BIOS beep error codes.

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.

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