ApolloBoy Posted October 2, 2014 Share Posted October 2, 2014 I picked up a IIe Enhanced yesterday and it's in good condition aside from the power supply. The system refuses to power up and all I hear from the PSU are some clicking noises. I poked around inside the PSU and replaced most of the caps, but I'm still having the same issue. This is particularly strange as this is one of the PSUs which lacks the infamous Rifa caps. Anyone have any ideas? Quote Link to comment Share on other sites More sharing options...
david__schmidt Posted October 2, 2014 Share Posted October 2, 2014 A constant ticking could be a short. Have you tried removing all cards? Any stray pennies stuck in the card edge connectors? Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted October 3, 2014 Author Share Posted October 3, 2014 It still clicks even when unplugged from the motherboard, which is in nice condition. Quote Link to comment Share on other sites More sharing options...
Osgeld Posted October 3, 2014 Share Posted October 3, 2014 clicking on a switcher like the II's use indicate a short (overcurrent) or no load at all (many modern systems supplies wont start without a minimal load of some value attached) that is when they are in good working order. otherwise your going to have to poke n probe cause something else is causing your problem, tripping the crowbar circuit Quote Link to comment Share on other sites More sharing options...
trash_44fr Posted October 5, 2014 Share Posted October 5, 2014 Hello, I had the same issue with an Apple //e motherboard. One of the caps between the slots was shorted. Removed it and replaced it with a new one solved the problem. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted October 5, 2014 Author Share Posted October 5, 2014 (edited) Hello, I had the same issue with an Apple //e motherboard. One of the caps between the slots was shorted. Removed it and replaced it with a new one solved the problem. It still clicks even when unplugged from the motherboard Edited October 5, 2014 by ApolloBoy Quote Link to comment Share on other sites More sharing options...
Arbee Posted October 7, 2014 Share Posted October 7, 2014 AFAIK it'll also click if there's no load at all, like Osgeld said. In which case unplugging it doesn't help. If you have a VOM, check if any of the power rails are shorted to ground. Quote Link to comment Share on other sites More sharing options...
barrym95838 Posted October 9, 2014 Share Posted October 9, 2014 (edited) I had a similar problem with my ][+ power supply about 25 years ago, and it wound up being the full-wave rectifier chip. It was an easy swap, once I figured it out with a DVOM. Mike Edited October 9, 2014 by barrym95838 Quote Link to comment Share on other sites More sharing options...
trash_44fr Posted October 12, 2014 Share Posted October 12, 2014 It still clicks even when unplugged from the motherboard, which is in nice condition. As Arbee said, this is the normal behaviour on an Apple II PSU with no load. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted October 24, 2014 Author Share Posted October 24, 2014 I managed to make some progress with the IIe today, I reseated all the major chips, recapped the board, and removed the Unidisk controller and Super Serial cards. It somewhat works now, but it just displays a screen filled with inverted color @ signs and little checkerboards. I'm assuming the RAM or one of the logic chips is at fault? Quote Link to comment Share on other sites More sharing options...
trash_44fr Posted October 25, 2014 Share Posted October 25, 2014 I'm assuming the RAM or one of the logic chips is at fault? It could be anything (CPU, TTL chips, RAM, ROM, IOU, MMU, ...). If all the chips are socketed, you can try to swap them. Quote Link to comment Share on other sites More sharing options...
MarkO Posted October 27, 2014 Share Posted October 27, 2014 (edited) There have been more than a few posts about these sort of Display Behaviors at Apple Fritter: http://www.applefritter.com/content/apple-ii-displays-question-marks-and-flashing-blocks http://www.applefritter.com/content/apple-ii-bad-memoryrom And Another on Video Troubleshooting: http://www.applefritter.com/content/apple-ii-problems You might join Apple Fritter, and ask there.. SpeedyG can be a bit abrupt., but his Technical Help is Top Notch!! MarkO Edited October 27, 2014 by MarkO Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted June 6, 2015 Author Share Posted June 6, 2015 So I went back to this just recently and decided to do some more troubleshooting. I've replaced most of the logic chips and I even burned some EPROMs with the CD, EF and video ROMs; still no progress. I'm thinking it's the RAM at this point but I'm really not sure if I should continue my attempts to fix it or just sell this system and pick up a IIGS. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted June 7, 2015 Author Share Posted June 7, 2015 I think I might have found the culprit. The HAL chip gets super hot within a few minutes of the system being powered on so I'm pretty sure that's what's causing my problems. Anyone know where I can get a replacement? Quote Link to comment Share on other sites More sharing options...
Baldrick Posted June 9, 2015 Share Posted June 9, 2015 The HAL chip is a 74LS109 right? You can buy replacements at Jameco. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted June 11, 2015 Author Share Posted June 11, 2015 The HAL chip is a 74LS109 right?No, it's actually a PAL (programmable array logic) chip. I couldn't find an exact replacement so I wound up ordering a PAL16R8 chip, which I'll then program with the JEDEC file used by the HAL chip used in the IIe. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted June 25, 2015 Author Share Posted June 25, 2015 So I replaced the HAL with a GAL16V8 using the same JEDEC file as the original chip, aaaaaand it still has the exact same problem. I can't even run the built-in diagnostics so I can't even tell if the CPU or RAM are at fault. If anyone wants a nice IIe parts system in the SF Bay Area, let me know... Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 6, 2015 Share Posted July 6, 2015 So I replaced the HAL with a GAL16V8 using the same JEDEC file as the original chip, aaaaaand it still has the exact same problem. I can't even run the built-in diagnostics so I can't even tell if the CPU or RAM are at fault. If anyone wants a nice IIe parts system in the SF Bay Area, let me know... Have you found a resolution yet?? Or have you acquired another computer? MarkO Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted July 6, 2015 Author Share Posted July 6, 2015 Have you found a resolution yet?? Or have you acquired another computer?Yeah, I got a IIGS recently and it works just fine. I haven't touched the IIe since and I just want it gone now. Quote Link to comment Share on other sites More sharing options...
MarkO Posted July 6, 2015 Share Posted July 6, 2015 Yeah, I got a IIGS recently and it works just fine. I haven't touched the IIe since and I just want it gone now. I am interested, but I can't easily pick it up... Can you get a large enough box to pack it with 4-5 inches of protection around ALL Sides??? I will pay for shipping... MarkO Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted July 7, 2015 Author Share Posted July 7, 2015 I'll look into it. Quote Link to comment Share on other sites More sharing options...
ApolloBoy Posted July 20, 2015 Author Share Posted July 20, 2015 I am interested, but I can't easily pick it up... Can you get a large enough box to pack it with 4-5 inches of protection around ALL Sides??? I will pay for shipping... MarkO So I looked into it and I'd honestly much rather give it away or sell it locally, it's a little cost-prohibitive for me right now to get it thoroughly packed and shipped. Sorry. Quote Link to comment Share on other sites More sharing options...
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