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About EkriirkE

  • Birthday September 2

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  • Location
    SFBA, CA
  • Interests
    Sleeping & electronics.

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  1. EkriirkE

    Bootstrap card, and MP100 video issues

    I used randoms I had on hand (see this album https://imgur.com/a/69J7YWl ) and didnt have quite the same dimensions but they still fit fine But if you want exact value matches here (these are thru-hole so sizing is not exact but will fit): C1 https://www.mouser.com/ProductDetail/Nichicon/USR0G101MDD C51 https://www.mouser.com/ProductDetail/Nichicon/UMA1V3R3MDD Also the only obvious thru-hole I don't see any designation for [470u10v] which is not the type to go bad really (and mine tested well within spec), but "might as well" https://www.mouser.com/ProductDetail/Nichicon/UVK1A471MED Those 3 are the only electrolytics i saw, the rest being tantalum or ceramic. Replacing these with tant's probably won't (easily) work as the footprints are pretty narrow
  2. EkriirkE

    MessagePad OMP H1000 Glitching/Flickering Repair

    For clarification This fixed sound I had 100µF 25V on hand at 6.4mm dia and it fit fine And this fixed the display, you have to remove the logic board to get to it underneath: I had 3.3µF 50V on hand
  3. EkriirkE

    Bootstrap card, and MP100 video issues

    Your 100 will need to be recapped. C1[100u4v] and C51[3.3u35v]
  4. EkriirkE

    OMP glitching?

    Mine works fine w/o the backup battery
  5. I bought a MessagePad on eBay as "Broken, screen flashes" so I thought I'd give it a go in repairing it blindly... First observations: It's an Original OMP H1000; No sound, occasionally the display would show through, touchscreen is fine, faint mechanical ticking in sync with the glitching - not form the speaker. On first opening it the area around the speaker wires and power input has a white residue. C1 [100uF,4V] is a compact electrolytic that had some brown around it Replacing this got me sound (startup chime!). It also had the typical fishy smell when desoldering it. LCR meter showed correct value but obviously it was bad. Digging deeper I removed the main board to find another compact electrolytic C51 [3.3uF 35V] with brown goo around it. Fishy smell again, LCR meter showed as bad - no value at all. Replacing this got the display back! Final boot successful! https://imgur.com/a/69J7YWl
  6. EkriirkE

    SE/30 & Micron Xceed & clear plastic goodie

    Now that looks slick.
  7. EkriirkE

    Sad Mac (Plus, Rev 2 ROM)

    Nice troubleshooting
  8. Here's another project repurposing the CRT/case http://spritesmods.com/?art=macsearm&page=1
  9. EkriirkE

    Macintosh Plus Chirping Noise

    That's just silicone sealer to prevent possible arcing form the HV lead to the ground coating. Not necessarily required and I don't remember any of my macs having it. RTV silicone will do if you want. It was common in TVs.
  10. EkriirkE

    Macintosh Plus Chirping Noise

    Just want to throw out there, I had a 128 with a similar problem and it turned out to be a blown & shorted diode in the HV circuit https://imgur.com/gallery/fYSUd
  11. EkriirkE

    Mac Plus & hyperdrive 20

    luckybob & I ran across each other when I posted my similar machine elsewhere, so for sake of posterity I'll relay my revival of this device: (gallery here https://imgur.com/gallery/N6MXv ) ---- When first powered on upon receiving the machine I experienced exactly what lucky bob was. No HDD Spinup and a Dead Mac (error code forgotten) After repairing the drive for various issues (most of the above gallery covers this) I was still experiencing the same problem... The HyperDrive card honours the boot sequence of FDD > SCSI > HyperDrive, so I used one of my boot disks and after poking around some HDD utilities I found the drive was visible but not automatically mounting. I could manually mount it but then the system became unstable (freezing randomly), and my attempts at imaging the drive always stopped at sector 999 before locking up the system. Yes, 999, not a base-2 whole number like 1024. Any attempts to read anywhere past 999 would freeze. Interesting note; the device does not identify as SCSI or FDD (ala an HD20) so it uses its own ROM hooks/driver Side note: If the drive has no System, the mac will still Happy Mac anyway, but then immediately Sad Mac which explains the persisting post-repair issue because there ended up being nothing on it. After locating the drivers, booting from the driver install disk I could see the drive and mount it through the HyperDrive utility. And as I mentioned, my attempts at imaging ended up being for naught because the "Drawer" (faux partition) was empty. I initialised the HD with the utility, copied the System over and rebooted. It worked! Almost. Turns out the HD has a buttload of bad sectors (I very much doubt from my repairs, I know some will disagree): It booted through "Welcome to Macintosh" and just before Finder would load I got a system fault dialogue, forcing a reboot. So I ran Norton Utilities 2.0's Speed Disk which performs a surface scan and marks, nay, occupies bad sectors via files in a hidden folder - meaning a format will bring back the bad sectors, and copying/backing them up will not work as the Catalog Tree will lose the occupying sector infos... I re-copied the system and it boots perfectly now. ---- I can tell this was designed before HFS was a thing (when the 128 and 512 were using MFS which did not have [proper] folders and everything resided in the root) because the HyperDrive uses a system of organisation they called "Drawers" to make up for that. These were almost partitions but they all drew from the total free space of the drive, so they acted more so like folders residing on the desktop. One bonus of their system was you could password protect any drawer. It will happily work with HFS, thankfully. ---- There were 2 versions of the HyperDrive card that I'm aware of. One for the 128, and one for the 512/Plus. Being installed on a Plus seems too hackey to me since SCSI is available. If I had more than one 512K, I'd transplant it there.
  12. Base SE models tend to have a soldered-in battery, you will need to clip it out or otherwise desolder it. I like to install a holder on these to make future replacement a breeze https://imgur.com/a/qMnJF
  13. EkriirkE

    Macintosh Color Classic repair adventure

    Many times you can use a bright pen light, or flashlight and a pen or other object to cast a shadow wiggling it around a tiny bit to see where the light shimmers from the other side. Otherwise I just look for patterns in the vias (e.g. group of 3, a 4th about 1cm thaddaway)
  14. EkriirkE

    DB-19 Hot Juicy Awesomeness

    Excellence! What would your current unit price be? And housings?
  15. Just finished recapping a CC yesterday and it wouldn't boot. I resoldered any suspect points on the analogue board and checked the vias mentioned in here... Then I put a small 3V watch cell where the (dead) PRAM battery was... and it booted. Yay! This puppy is maxed at 10MB, i installed a spare 256 VRAM card and FPU. Also Lazarus, you are missing the green channel completley. I'd put it back to the "rosy" colour and focus on getting any hint of green to appear.