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Thread: Compaq Portable 486 screen replacement

  1. #1
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    Default Compaq Portable 486 screen replacement

    I'm thinking of picking up a Portable 486 (not sure if it's color or monochrome), but the screen is dead. It appears to work apart from that but I was wondering if anyone has replaced the screen on theirs successfully and what parts they used, etc. I can't seem to find much of anything on google. Also, just out of curiosity, is the CPU socketed? If it is I might see how far I can go with upgrades

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    If there is nothing on the screen how does it appear to work?
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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    Quote Originally Posted by Stone View Post
    If there is nothing on the screen how does it appear to work?
    They have a VGA connector on the video card

    There was just a post about replacing the screen, but no details if it was a different type of panel or they managed to get a working one out of China

    The fastest stock 486c was 66MHz. I've never tried a 100MHz in one.

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    It's currently a few states away and my friend will be picking it up for me. The seller says nothing comes up on the screen but the hard drive spins up, floppy drive seeks, it beeps, etc. I've seen a couple posts in various places about people looking for a solution but really no details or followups whatsoever.
    I have a dx4-100 laying around I'd like to try out in it if the cpu is socketed.

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    I'm on the fence whether I should buy this Portable 486 or not. The seller is asking $160 for it and it makes all the right noises like it's booting but nothing on the screen

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    Quote Originally Posted by RadRacer203 View Post
    I'm on the fence whether I should buy this Portable 486 or not. The seller is asking $160 for it and it makes all the right noises like it's booting but nothing on the screen
    The only 'noise' that you're going to get out of that deal is the 'wha-hoo' from the guy you just bought it from when he gets his hands on that $160. I'd pass unless the thing fully POST's.
    Surely not everyone was Kung-fu fighting

  7. #7
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    Quote Originally Posted by RadRacer203 View Post
    I'm on the fence whether I should buy this Portable 486 or not. The seller is asking $160 for it and it makes all the right noises like it's booting but nothing on the screen
    Don't buy any system you're not prepared to spend 20 hours and $100 troubleshooting. There are other portable 486s out there, likely for cheaper.
    Offering a bounty for:
    - A working Sanyo MBC-775, Olivetti M24, or Logabax 1600
    - Music Construction Set, IBM Music Feature edition (has red sticker on front stating IBM Music Feature)

  8. #8

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    Quote Originally Posted by RadRacer203 View Post
    I'm on the fence whether I should buy this Portable 486 or not. The seller is asking $160 for it and it makes all the right noises like it's booting but nothing on the screen
    Quote Originally Posted by Agent Orange View Post
    The only 'noise' that you're going to get out of that deal is the 'wha-hoo' from the guy you just bought it from when he gets his hands on that $160. I'd pass unless the thing fully POST's.
    Quote Originally Posted by Al Kossow View Post
    They have a VGA connector on the video card.
    Shouldn't be too hard to sort this one out. Hook up a VGA and see what happens.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

  9. #9
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    Often a "dead" LCD display is a blown inverter board. Looking closely at the LCD, move it around for several angles, and see if there's a very dim picture. If so, the LCD is working, but the inverter or backlight bulb died. Changing the bulb can be a B-!@#@@! on some displays. Inverters have a fuse and a couple of transistors that can pop.

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    Quote Originally Posted by DeltaDon View Post
    Often a "dead" LCD display is a blown inverter board. Looking closely at the LCD, move it around for several angles, and see if there's a very dim picture. If so, the LCD is working, but the inverter or backlight bulb died. Changing the bulb can be a B-!@#@@! on some displays. Inverters have a fuse and a couple of transistors that can pop.
    Seems like you are way more LCD savvy than I so see if you have an idea about this one. I've got a laptop where the screen has suddenly gone totally negative, color wise. I've run a gimmicky program on it that actually runs the colors in a negative fashion and all the colors look quite normal, this way, although it's too cumbersome for normal use. Do you know of any fix for this short of replacing the screen? The color output is also normal when I connect an external monitor to the laptop. FWIW, this color reversal does not manifest on a clean DOS boot. The screen is black and the characters are white.
    PM me if you're looking for 3" or 5" floppy disks. EMail For everything else, Take Another Step

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