NickH93

Thanks everyone. I'm happy to say I finally fixed it through a strange thought process. Early on, I replaced the HAL chip which made the text garbled and so I thought my replacement was no good either. I put the old one back in. Fast forward to now, I replaced an LS10 chip on the board which ALSO caused the text to be garbled up and the graphics to work with messed up colors. For some reason I thought "Replacing the HAL chip also gave these symptoms. Let's replace both chips that made the text garbled at the same time." and sure enough, that did it! Full color, full text. Now have my first fully functional enhanced //e Sorry for all the posting. Maybe this thread will help someone some day. Summary: New HAL and new LS10 chip was the fix.

No luck there. Thanks though. I replaced an LS10 chip on the board with the old one from the old Apple II, which I thought I did. Turns out I didn't. It flips the symptoms. Bad text, good graphics. So I'm starting to think both of those chips are bad from each board. I ordered two from mouser. At 79 cents a pop I'll try it out.

Sorry to keep updating, but I've found some things to better describe the behavior. First off, the LS244 buffer chips, I replaced those which did nothing either. Either way, I've learned that pattern I pictured is when you show Hires black. Lores black also has it's own pattern. Running a color test on the master diagnostic disk, each color has it's own garbled pattern that is always the same for each color. It's wrong, but each color has it's own pattern and it is always the same wrong pattern. Black has its own, yellow has it's own, etc. So something is consistently getting messed up when trying to display color. Does this help narrow down possibilities? Thanks!

I don't mean to keep posting, but replacing the aforementioned LS374 chip changed nothing at all. So now I am not sure where to go.

This is how the screen looks when I type HGR

Turns out I had two problems in the end. One was the cable as I suspected, which knocked out some rows of keys. A new cable fixed most of the keys. Then the chip next to the keyboard connector (UE14) had an intermittent failure that took out 3 keys, which was affected by it's placement in the socket. All the way down and keys would go out. If I left the right half up a little, it would work. I confirmed the chip was the issue in a new motherboard. At any rate, I have a new motherboard with a good chip after having so many issues with this last one, the biggest of which was corrosion causing the board to just...fall apart. Thanks everyone for the help. Have another issue I'm trying to sort out on the new MOBO, but that is in another post. +1 on the alcohol cleaning the keys, btw. It improved them rgreatly (still had intermittent key issues according to my continuity tests. Alcohol fixed that up.)

I will post a picture of what the screen looks like in HGR mode when my phone has more charge to it and I can actually run the camera. The hex dump showed all zeroes after doing this test. I also found a similar test where I set all data in the graphics parts of the memory (2000-5FFF) to FF and cycle through the modes and see if the data remains FF, which it did.

I am only replying to save anyone who may reply this: There is one chip that was recommended to replace for someone who had a similar problem. I couldn't replace it from my old motherboard because it was soldered on and that chip basically fell apart when I tried to desolder it. Now you see why I replaced that motherboard. It was all that corroded. Anyways, it is chip LS374, and i have some coming in the mail. I will update when I try the replacement. In the mean time, any help would be appreciated if there are any other ideas! Thanks -Nick

I got sick of the issues with the last Apple //e I had and when the motherboard started falling apart, I bought a new one. I have a nice Rev B board now. Anyways, when I boot up, I get the Apple //e screen, I can see it perfectly. I can program in BASIC, do whatever. Anytime color graphics are involved though, the screen becomes a mess of colours. Tried replacing the HAL chip, and both HAL chips I have heat up when it is in graphics modes. Tried 3 different video roms (two from my two boards, one from an enhancement kit), and I tried swapping any other IC I could and I have no progress. Self test gives me system OK. or occasionally will give me a RAM error. I've tried replacing all of the RAM, that makes no difference either. Any ideas?

That was some crappy brand from the school I was at at the time in the picture. I play an a Squier Jazz Bass when I need a beater, but I also use an Epiphone Viola, I have a Galveston 7 string, and the Ed Sullivan Show anniversary Hofner. So my collection isn't all that great, but I love them none the less. Peavey made one of my favourite basses, the T-40. Anyway, based on everything I've tested I suspect the cable might be bad. The connector looks messed up on the pin that would cause my keys to be out, and flipping the cable (Mobo to keyboard, keyboard to mobo) around causes other keys to go out that weren't out before.

So the pin fixed some of the keys, but the row I have out is leading to pin 18 on the IIe keyboard connector. I've verified all the switches are good with a multimeter. Pin 18 on the keyboard isn't continuous with pin 18 on the mobo, so somewhere the connection doesn't make it to the computer. I've also tried shorting out the switches while the computer was running (which causes a keystroke on working keys), and this row doesn't respond to it at all.

Pin replaced, found a cracked solder join on the RCA connector which would explain the intermittent video. Anyways, I'll update once I fix the power supply and get actually boot this thing without fear of a smoking capacitor. Haha. Thanks for the help everyone. This whole forum is the best

On further inspection, my keyboard connector on the motherboard has a broken pin. That'll probably do it. I'll either replace the pin or the connector, and we'll see from there.

Mine is a white key keyboard. I hope that isn't the case, but when I get the power supply fixed I'm going to try contact cleaner to get the keys working. Given the amount of corrosion I had to clean on the rest of the system, I would not be surprised if that many keys had oxidization on the key contacts.

So I took a gamble on an as-is Apple IIe, and I cleaned it out (more dirt than you could imagine inside), and it booted up. Yay! (sorta) Well, the power supply filter capacitors (RIFA) took a dump (as they tend to do) after running the machine for a little while with the floppy controller in and made my room smell horrible. One fizzling sound and puff of smoke later, I have my work cut out for me. I'll have to fix that, but since the Apple II functioned after that happened, I know it did no damage. Anyway, the keyboard has a lot of dead keys. I've tried redoing all of the solder points on the keyboard, which didn't really help. It may have killed a key or two, even, but I didn't get an accurate count of how many keys were out to begin with. They are in groups, though. For example, 1 through 9 do nothing, the whole top row does nothing from left to right until P, and several other keys don't function either. Any common fixes that I haven't been able to find? Any suggestions? Thanks! Nick