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joe4227@sympatico.ca

6502
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    15
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  • Location
    Waterloo, Canada
  • Interests
    Mac IIci, Powerbook 150, Powerbook G3, Powerbook G4
  1. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Just getting back to this. I guess I will need to get the 'scope out of storage, and will definitely consider re-capping the display. Just hope that it doesn't turn out to be the Grey-Scale chip. I guess the scope will tell us whether the signals are on the ribbon or not. Still looking for specs on that GS Controller, if anyone has found them...
  2. joe4227@sympatico.ca

    Powerbook 180c Video Issues

    This machine is new to me, from eBay. The screen seems to flash between full and half height, and the image ghosts in both halves (upper hal and lower half). Moved the display back and forth, doesn't seem to be the cable. Also inspected inside the LCD. Nothing obvious. First question - does this sound like the Active Matrix Display itself, of more like a problem with the video controller. That will a Chips and Technology controller, not sure which yet. This machine is much more complex in terms of boards and cables than the 150 was! I have the "Service Source" and the Dev notes, but nothing obvious there. Most issues with this (Sharp LQ9D011) active matrix colour display refer to bad pixels, etc. If this were a CRT, I'd be looking for Horizontal Sync problem. What would the equivalent be in this technology? I bought this machine because it has ADB, and allows an external monitor to be connected. I have to find the right cable first before I can do that!
  3. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    The ribbon cable has 15 connections between the GSC and the Display.
  4. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Np joy! I cannot find the app notes for the CHIPS & Technology F65210A. They got bought by Intel, later divested to Asiliant, after that, who knows. The parts are still around, but try to find the specs/notes! Also no joy finding specs or pinouts for the Casio/ACER MD800TT10-C1... If anyone else has these, please let me know!
  5. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    It's not. The GSC in the 150 is a CT65210A. So now to find the sheets for that!
  6. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Some progress! Apple Developer technote for this machine contains block diagram and describes *some* of the hardware. Found here: http://developer.apple.com/legacy/mac/library/#documentation/Hardware/hardware2.html It tells us that "The Display is a 9.5-inch flat panel film super twist nematic (FSTN) dual-scan liquid crystal display (LCD). It provides 640-by-480 2-bit per pixel resolution, is capable of displaying 4 levels of gray, and has on-demand cold cathode fluorescent lamp (CCFL) backlighting. The video implementation on the PowerBook 150 is similar to the video on the PowerBook Duo 230. The video RAM is a 128K x 8-bit device that stores the data required to update and refresh the flat-panel video display. The VRAM for the PowerBook 150 is mapped to locations $6000 0000 through $6080 0000, as it is on the PowerBook Duo family. The display hardware supports 1-bit and 2-bit per-pixel grayscale. The value for the PowerBook 150 panel ID is 4." More importantly, I learned that the "GSC" chip stands for Grey Scale Controller and is actually a Chips and Technology Video Controller chip. In most cases, I think they used the 65525, but I will confirm from the hardware. If that is the case, I have the Application notes with pinouts for that chip, which will tell me the pinouts on the LCD ribbon...
  7. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    I will look for a good screen first, and possible a "for parts" machine with the Interconnect board. The main prob with these old machines is the decay of the poor quality plastic. I think Apple was trying use biodegradable stuff. So the first thing that happens when you start working on them is that the mounting posts crumble, then the hinges. Nothing good epoxy won't patch. The caps on the LCD are the same type of SMC that Trag uses for recapping, and there aren't very many from what I saw. Would like to try "troubleshooting the screen. If I knew the pinout, I could use a digital signal pulser to strobe the leads and see if it produces anything on screen. That would show whether the prob is the screen, of something in the Jedi Connect chain, or possibly the MB... Should also be able to look at waveforms form the MB, as it does appear to boot. But will have to dig my scope out of deep storage to do that! We moved about a year ago, stuff is still in boxes!
  8. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Haven't given up on this machine just yet. The memory adapter holds the ram mod I bought at a local Apple store many years back. They installed. The machine never recognized the ram. Store is long gone... I noticed the RAM module is marked "duo" - maybe wrong for that machine. I have another RAM module on the way from evil bay. Will see if it works - IF I can get the screen up! The machine is worth fixing to me, as it uses IDE drives! The 180c uses SCSI. Point of all this is actually to port my old software to images on the PB G4 and PC under linux/Windows under Basilisk. So I have to find some way to read original floppies (ALL densities, they are old). The G4 can read 1.4 Meg floppies only. And also to transfer things from the IIci to the other machines. BTW - does someone know a way to connect the Mac IIci's internal SCSI drive to one of the Powerbooks via the external SCSI connector? Is there an adapter that will let me do that? With the IIci, I am cogitating on the best way to replace the tin-can capacitors on the MB with the replacement SMC Tantalum caps I got from Trag. Not quite sure of the best way to orient and connect those little square beggars to the old form-factor holes on the MB. Anybody?
  9. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Apparently there is more than one "Jedi Board". I have seen photos of and have the card that holds the extra RAM. As far as I know that's the Jedi Ram Adapter. But the long, thin board that conatins the speaker, and into which the Inverter Board plugs, is also the interconnect between the Screen and the Motherboard. This one is clearly labelled "Jedi Interconnect Board" in my machine, and it is this one to which I referred above. It's also the one that has the big ribbon cable which connects to the Motherboard, and the keyboard connections. Without that board, there is no way to connect the video to the screen...
  10. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    nvdeynde - I did have the display out. And I removed the white cover on the side where the Fluoro tube is. The caps I saw were visible without disassembling the entire display, as they are on one side in a recess in the white case. (It's the Casio/Acer LCD). Are there more on the back of the LCD itself? I assumed no, due to the thinness? insaneboy - No, this was pretty clean looking machine, but the seller had no adapter to fire it up, so was selling for $25. I think it was a "Buy it now" sale, and it must have been snapped right up! One machine, alone. I tried resetting the PRAM and Power Mgr today. It comes on, backlite, and disk runs through the normal startup. But I am getting NO chimes at all, and no screen detail at all. WHich leads me to wonder - Inverter board is working, as backlite is on. But and I *think* the briteness/contrast are working. So with no sound - leads me once again to suspect the JEDI Interconnect board. Anybody got hints on troubleshooting the JEDI Interconnect board in the absence of another to swap out? Or could the problem actually be on the MB?
  11. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    In disassembling yesterday, the caps all look like the day they were born. They are all SMT's. No leakage. The Pram battery is showing about 1.3 volts, likely one cell is dead, again no leakage yet. I have an uncomfortable feeling that it's the JEDI Interconnect board. The machine came on when I was assembling it at one point, just as I was plugging in the cable between the JEDI and the Motherboard. The invertor board must be working, as the fluorescent backlight is on. Without schematics, it would be difficult to troubleshoot it properly. Could have blow the video output chip(s) on the MB, or something on the JEDI board. Luckily, today I found a 180c on eBay, and managed to get it. So a little step up. I want to keep a 68030 machine running while I am recapping and restoring my Mac IIci. There was another 150 on eBay a few days ago, sold for parts as the owner did not have the Adapter to test it. But it must be gone, as I can't find it now! If I can find another machine, I can compare volyages, etc between the two...
  12. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Yes, I haven't found them to be much help. They are pretty vague. Did Apple not provide actual schematics for these machines? These are basically swap-out guides for line of sales staff. For example most LCD displays can be repaired, recaped, etc. The guide simply locates the problem assembly and swaps it out for another. That's not actually repair. And of course get swap out assemblies for this old a machine may be troublesome! (though I believe there lot Casio LCD MD800TT10-C1's out there, even new. I am suspicious of the cables and contacts. Plastic parts this old are crumbling. It's a shame, because I know this machine is booting normally, though with no display. Anyway, I did disassemble the display, and did not see any obviously bad elements. Will have to meter test the caps. The back-light is operating normally.
  13. joe4227@sympatico.ca

    Powerbook 150 - screen is blank

    Powerbook 150 that has been working like a charm. Screen suddenly shows nothing. Brightness and contrast seem to work. Backlight is on. Boots up normally with normal chime. Need help to troubleshoot the display. I have worked on CRT's, but not LCD's.
  14. joe4227@sympatico.ca

    Sick Mac IIci Board

    I have a MacIIci with similar symptoms, which then failed to boot. Am in the process of re-capping now. BTW, just a thought - did you replace the Battery with a new one, and reset the PRAM? If the Battery is bad, it will drain the power-on circuit, and shut down.
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