Search results

@jktw which board(s) do you need to recap?

I got the original PrairieTek 20MB hard drive imaged. Here's the recipe I used. Beige G3 desktop Mac with a USB card installed USB hard drive USB thumb drive Burned a CD with Debian linux 8 (debian-8.11.0-powerpc-CD-1.iso) Put gddrescue_1.19-1_powerpc.deb on the thumb drive Installed Boot X on...

Repair update: I did get the old drive working after replacing the blown opamp. It has Outbound software version 1.3b2, which I think is already available online, but I'm going to attempt to image the drive regardless. As I was working with the machine, I noticed side-to-side tracking was...

I connected the HDD's 12V/5V rails to a bench power supply and it still wouldn't spin up and was dragging down the 5V rail. Checked its main board with a thermal camera and found that a L272D at U15 was getting hot. That's an opamp that likely drives the motor. While I wait for a replacement IC...

Almost 100 capacitors later and this machine is working again. I need to adjust the CRT a bit, but otherwise she's working well!

Here's what the HDD sounds like at boot. A ~1sec attempt to spin while the boot chime is happening.

It turns out this bodged in resistor near one of the legs of the HDD bracket was shorting against it. I added some kapton tape to it and the machine turned on! 🎉 Unfortunately the HDD is now not fully spinning up. It tries for maybe a second before giving up. Tried a bunch of cycles but it...

Do you know what itd be listed as other than a flat flex?

Thanks. That makes sense intuitively. It was a bear to get out and might have gotten damaged. I’ll beep it out.

Still just getting horizontal lines on the screen. They're usually regularly spaced and thin, but occasionally chunky and random. Things I tried doing that didn't change the symptom: - Separated back panel from system - Removed ROM - Cleaned ROM and RAM incl. sockets with contact cleaner -...

While I was at it I measured the caps pulled from all of the other boards. So many! Power Supply RatedMeasured% DevDFNote 0.47µF 100V506nF+7.7%0.02In spec 10µF 63V9.4µF-6.0%0.04In spec 9.6µF-4.0%0.04In spec 10µF 250V10.9µF+9.0%0.02In spec 10.8µF+8.0%0.02In spec 47µF 25V44µF-6.4%0.09In spec...

I finished recapping the analog board on the MegaPixel display. Though it seemed to be working fine, many of the caps were out of spec or outright bad. RatedMeasured% DevDFNote 0.47µF 100V447nF-4.9%0.08In spec 1µF 100V778nF-22.2%0.18Out of tolerance 1µF 160V930nF-7.0%0.20Borderline DF 22µF...

Slightly better shots of top and bottom side.

@Kai Robinson I'll try to get better photos the next time I tear it down, but here's what I have.

@trag I found one new on eBay for a decent price so got that. Thanks for the model ID!

Thanks for the tips. For reference, the transformer output is 19V AC (1.26A) center positive.

I recapped the MLB and discovered a few things along the way. 1. 4 of the 5 axial caps are not accessible from one side. Their joints are below 6 ICs and a connector. I ended up cutting them out, heating the remaining leads and pulling them out, then clearing out remaining solder with braid. I...

I recently got an Outbound Laptop with its original 12V AC power supply. I was able to get it to power up once, but the next day I could not get it to power up again. First stop is caps. I'll share a cap list and repair journal here. Hopefully it'll be an easy one. There is a lot more info and...

My power supply is model 152.00 but matches the cap list above.

I added a cap map for the N4000A analog board and made a correction in the list: C202 was mislabeled as C1. The sound board is very straightforward so no cap map needed. But there is a connector very close to one of the 47uF/16V SMD caps. I removed that before replacing the cap to avoid melting...