Search results

While waiting on my logic board capacitors to arrive, I decided to test some voltages. While booted, the fan connector is outputting 10.4v and the ADB port is outputting 4.49v. I guess I'll need to order some analog board capacitors as well.

Yeah, I'm not getting a chime anymore. I've removed the back shell and carefully set it back up. When I hit the soft power there's the little fizzle of the CRT starting but nothing displays.

Not any change. Pop of the speakers coming on, fan spins, chime *not* happening this time. Hmm.

Yes, I've used the keyboard's soft power to start it. (Thank you for checking.) The rear fan spins, the lights come on, the chime sounds clearly (or staticky). The first few times, the CRT comes on with a flashing question mark. I'm letting it "soak" for a half hour with the power switch on...

Hello, I just got an LC 520 that's been in storage for years. I removed the battery (no signs of any damage) and cleaned the logic board. When I flipped the power switch, I got the CRT "whomp" charge-up. That happens after I've let it sit for a while before flipping the switch. Otherwise I hear...

I've cleaned the board with vinegar, a toothbrush, distilled water, then alcohol. I tested the continuity of the EGRET chip and Pin 3 did *not* connect to the Y1 crystal, despite it being right there and the trace looking perfect. I added a bodge wire. It chimes! (and reboots with...

Pin 15 of the EGRET (U7) is at 5V so that chip is working. (reference: https://68kmla.org/bb/index.php?threads/lciii-is-not-working-no-picture-no-sound.37477/post-405734) I'll take the advice in that thread and clean the heck out of the board with vinegar and then alcohol.

Thanks for the suggestion. I reflowed the solder joints on the ROM sockets and added a bit of solder to each. I also reflowed the solder on every pin on the EGRET chip. Unfortunately, no change.

I bought an LC III logic board cheaply, and the seller didn't know if it ran. The fan spins and the three lights on the keyboard flash but there's no chime or video. I've recapped the board and there was very little corrosion. I have soldered in the C22 cap reverse from what the silkscreen says...

I received my official 9W Newton adapter today. It's outputting the correct voltage. I plugged it into the eMate, there was a brief flash of the green LED, and then a slight burning smell. I'm able to narrow it down to the power area of the logic board. Lovely! I connected it an eMate I just...

Thank you for the offer but I was able to snag one on eBay. If I have need of another one I'll send you a DM.

I did email Frank and also found Walt Berger, who used to do eMate battery rebuilds. Walt recommended using a genuine 9W Newton/eMate adapter. I'm biting the bullet and getting one. I'll check out the NewtonTalk mailing list, too.

Thank you all for the help. What should I do now in an attempt to find what's causing the problem? Is there a document or video that can get me started on tracking down problems on a logic board? Start checking voltages with the multimeter while it's plugged in? The eMate doesn't seem to be as...

Is the junk near C93 an indicator of a leaky cap? I understand that there's flux on the big connectors for the transformer next to it.

OK. I'll check those out. I've attached an unobstructed view plus two shots of the other side of the board.

When I plug in the adapter the light immediately turns green and then turns off. The adapter is 7.5V DC 2A. I took the battery out first to stop any damage, but I hooked it back up once to test. The light blinks the same way with a battery pack connected.

Here's the side of the board that's exposed when the bottom is taken off. I'll need to desolder the speaker and backlight wires again to get the board out.

I've purchased an eMate 300 and its only sign of life is the green light flashing once every 2 seconds. I removed the battery pack (no sign of leakage or damage). I'm using a third-party adapter and the multimeter says it's outputting 7.5v as expected. I then took the eMate apart and the LCD...

It's online! As my MARCHintosh2022 project, I've published a beta version of The HyperCard Center, a website hosting web-formatted HyperCard reference docs! https://hypercard.center/ I'm working on the HyperTalk Reference stack to start off. This is a work in progress and most of the...