Recent content by JDW

I appreciate your reply. A "weak power line" is a phrase that is extremely broad. Technically, any PCB trace that carries 5V or 12V power is a "power line" throughout the entire machine. So because that statement doesn't nail down a specific location in the machine, it's not a question I can...

Well, the verdict is in. Recapping does nothing to fix these problems. My gut instinct was 100% correct. More specifically, I replaced all 5 electrolytic capacitors with high quality polymer capacitors. Absolutely no changes in machine behavior occurred after recap. After reassembly and...

Mouser finally got the caps in stock and I just placed my order. Will update again after I've soldered them in a tested.

Thank you for clarifying that the board you replaced many years ago was the PMU board, which I show front/back hi-rez photos of in my earlier post here: https://tinkerdifferent.com/threads/wont-power-on-powerbook-wallstreet-pdq.5575/#post-49654

I appreciate your time, and thank you for your thoughts. There are 3 power boards: 1. The small PCB at back with barrel plug for connecting to the external AC power adapter. 2. The T-shaped power boards sitting between the two drive bays and which separate from each other via connector...

Just wanted to updated this thread to say that an alternative source of +12V power for a CPU FAN has come to my attention. It was right in front of our eyes the whole time... a The LC575 schematic mentions it here: I've not used J7 yet, but it would eliminate the need to run wires to the...

@Kai Robinson can correct me if I'm wrong, but I believe the SE Reloaded board layout began during the 2020 COVID lockdowns. The board has been through a few revisions now. I can only say that the SE Reloaded motherboard that I made a video series about continues to work flawlessly to this...

@wottle I just finished watching your video and I must say the amount of work you’ve contributed to this LISA-FPGA enhancement project phenomenal. Software overrides for physical Jumper settings, full-featured on-screen ES floppy remote interface, FujiNet interface, ability to work with...

Today is Wednesday — two days since my last power-on attempt. I pressed the power-key today and got the bong and a complete boot. I deleted files and did various things in the Finder, and it suddenly lost power 25 minutes later. I waited 3 minutes and pressed the power-key again, and to my...

Sadly, stupid Mouser postponed the date that the out of stock capacitors were due to be delivered to them. It was originally scheduled for October 19th and now they’re saying 30th.

It's Monday morning and the machine was connected during the weekend. Pressing the power key caused the normal Bong song and the HDD spun up and the LCD backlight illuminated, but 10 seconds later, it suddenly lost power. ~!@#$%^&*(! 😤 Anyway, this test seems to indicate that a PMU Reset is...

I've never owned an Xbox of any kind, so I am not equipped to answer that question. It's been two days since my last post. Today, I pressed the power key and got nothing. Normally, if I leave it at least a couple days plugged into the wall, it will most often power on, but not today...

@wottle , you're amazing! LISA-FPGA owners like me wish to THANK YOU VERY MUCH for your hard work on making the experience INSANELY GREAT!

I left the PDQ in its LED-blinking sleep state over our 3-day holiday weekend, and when I arrived back in the office, the LED was no longer blinking, and pressing the Power key did nothing. So even while in Sleep, the stupid sudden power-loss problem still rears is pathetic ugly head. 😡

I've been pressing the darned Power key every freaking day and finally today the "semi-good" PDQ booted. I was able to booted from an OS 9.0.4 CD, do an OS install, download software from Macintosh Garden, and do other things for more than 1 hour, and it didn't suddenly power off. I was out of...