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Ibm T-40 No Video Display

post #1 of 4
2/2/07 at 4:36pm
Thread Starter 
Hello, Hoping for alittle help with a t-40 IBM. You can here it power on lights OK but no video. Not even alittle bit. I plugged it into an external but still nothing. Not a backlight issue or inverter, the LCD works fine. I hear it power up and the hard drive truns on just no video display. Any support would be appreciated.
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post #2 of 4
2/14/07 at 3:32pm
I have the exactly same problem on same model T40, actually i can get video on it after many power on tries but it gets blank in some minutes, tested with other memory , same problem, took out hdd/sound card/dvd same problem. reseated lcd cable on back of lcd and motherboard same problem. reseated inverter cables. same problem.

Any suggestions?
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post #3 of 4
2/14/07 at 9:38pm
Thread Starter 
No one else seems to know. I am guessing that it is the BGA Video Chip because Caps, Resistors, Diodes have to do with bringing power to specific components. I have purchased some crap boards off ebay and was planning on trying to extract the video chip using a pencil torch, if it seems easy enough I would try and do it with this board. I would just like to get this thing up and running cause the resell value is excellent on this laptop.

Looking at your post, funny but I have another T-40 I am working on, same problem as yours. It is working one minute and I lose video the next. I am not moving the machine when I experience this problem, nor am I punching keys. The lights stay on but nothing on video. I have not tried to plug it into an external while this problem is happening but next opportunity I will try. If I get nothing on the external, even after the function F7 key is pressed I will have to assume it is an intermittent problem and will consider heating up the board to reflow some of the solder welds. What do I have to loose at this point.
Oh also when the screen goes dead I turn the system off and right back on and all is good almost like it did not even happen. Really strange.
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post #4 of 4
2/15/07 at 6:26am
i tried with a external screen, i couldnt get it with fn+f7, if you have any solution, please share with me.

Even i changed in bios to VGA external, then when i turn on computer it is on external , video comes on but after some minutes it goes off just as in internal.
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