Question about IBM ThinkPad T40 2373 Notebook
On the second Thinkpad laptop, that doesn't show a display with an LCD screen.
Plug a VGA monitor into the VGA port on the back of the laptop.
Hold the Fn key down, tap once on the F7 key (Toggle your display over to an external monitor)
Give the VGA monitor a few seconds to come on. (It's a VGA monitor)
Do you have a display on the external monitor? No? You May have a bad GPU then. (Graphics Processing Unit,
Fix? Change out the motherboard. Possibly Ebay has one, dunno.
VGA monitor has a display? Then you may have a bad Inverter. The Inverter provides power for the LCD screen. Inverters go bad.
Are both Inverters the same? (Laptop to laptop)
BE SURE. The Inverter MUST match the LCD screen!
Check the numbers on both Inverters. If they are the same, switch the good one over to the 2nd laptop. See if you have display now.
Then it's the GPU.
Service Manual for IBM Thinkpad T40,
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Posted on Nov 20, 2009
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Posted on Jan 02, 2017
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