First post, by vvbee
Have a TI TravelMate 4000M laptop (486) that doesn't work, and am looking to either fix it or strip it for parts. Was sold as non-working, and got lots of cosmetic damage in shipping.
What it does on power-on is it illuminates the power light and the keyboard leds, and spins the hard drive. No image on screen, and no signal to an external monitor. This is also how the seller described it. No indication of hdd activity, except the hdd led blinks once or so right after power-on. Curiously, the keyboard indicator lights don't respond to keyboard input - you can press the numlock or whatever and the light won't change - until you cycle power. For whatever reason, it seems that the caps lock controls the numlock light, and the numlock controls the caps lock light, or something like that. It's possible the lights just come on randomly each bootup, but I'm not immediately sure that's the case. If you keep the laptop running for a minute or two, it starts erratically beeping and blinking the battery light, whether there's a battery or not. The ac adapter (original for this model) is from another source, but measures good and looks ok internally.
I tried a few basic things already. There was an optional ram expansion installed, removing that didn't help. Removing the hard drive and floppy drive did nothing. Removing the battery, nothing, same with unplugging the battery leads off the motherboard. Capacitors seem fine. Can't see leakage onto the board from the motherboard battery, but there is some discoloration at the terminals. Tried blindly triggering some common keyboard shortcuts, but nothing, not even hdd activity. There was a screw missing off the bottom, so someone may've had a go at it already.
Haven't yet tried powering it on without the sound card, which probably won't do much good, haven't tested for any blown fuses, and haven't taken off the motherboard battery. All I can think of right now. Any knowledge on this particular topic?