General Category > Lisa Troubleshooting and Repair
New Lisa Build does not work - please help
aihk:
--- Quote from: sigma7 on April 04, 2025, 03:44:43 am ---
--- Quote from: aihk on April 04, 2025, 03:13:35 am ---English is not my native language, I use machine translation
--- End quote ---
That is ok. I will try to write accordingly. Please ask for clarification or another written expression if the translation is not clear to you.
It may help to say what language(s) you understand best. I can test translating, then back to english, to see how the meaning changes.
--- Quote ---The red box makes a beep when I only plug in one memory module, and if I insert the memory module into a slot that is not a red box, it will turn on the phone with two buzzers.
--- End quote ---
The memory board will NOT work with 1 module. Please install 2 memory modules in the same positions as in your video "IMG_7302". The two white sockets are marked MEM1.
Did you test with the I/O Board removed/missing? Was there any image on the screen? If so, was the image changing or steady/static?
Do you understand the suggestions to check if the parts are correct and all pins soldered?
--- End quote ---
I uploaded the boot video. I used RGBtoHDMI.
I also found some other information on the Internet, it could be caused by the memory module.
https://68kmla.org/bb/index.php?threads/lisa-error-45.45464/
https://68kmla.org/bb/index.php?threads/apple-lisa-sun-remarketing-2mb-expansion-what-ram-do-i-need.2598/#post-29773
I made a new 9x256 memory module. The PCB is still in transport and I can't be sure if it will work
aihk:
--- Quote from: sigma7 on April 04, 2025, 03:44:43 am ---
--- Quote from: aihk on April 04, 2025, 03:13:35 am ---English is not my native language, I use machine translation
--- End quote ---
That is ok. I will try to write accordingly. Please ask for clarification or another written expression if the translation is not clear to you.
It may help to say what language(s) you understand best. I can test translating, then back to english, to see how the meaning changes.
--- Quote ---The red box makes a beep when I only plug in one memory module, and if I insert the memory module into a slot that is not a red box, it will turn on the phone with two buzzers.
--- End quote ---
The memory board will NOT work with 1 module. Please install 2 memory modules in the same positions as in your video "IMG_7302". The two white sockets are marked MEM1.
Did you test with the I/O Board removed/missing? Was there any image on the screen? If so, was the image changing or steady/static?
Do you understand the suggestions to check if the parts are correct and all pins soldered?
--- End quote ---
The same picture still appears after I removed the IO board. I mailed the memory module to a friend far away, and he can start up and see the with the same memory module as mine. Since I didn't solder the parity chip on the memory module I gave him, it got stuck at error 45. I there is a fault with my CPU card. I repeatedly start it up and it always shows the same picture, unless I change to a different memory module, then the picture will change It seems that there is a fault with the even-numbered memory slot on my memory board. Now I'm blind and don't know where to start. Without a running normally to determine which board is the problem, it's difficult to troubleshoot.
sigma7:
--- Quote from: aihk on April 08, 2025, 11:15:38 am ---(I) don't know where to start
--- End quote ---
Troubleshooting an electronic circuit that has never worked in the past can be extremely time consuming and difficult.
To not waste time, it is important to search for the common problems that can be found just by looking.
Do these things first:
1 - Carefully review the sites and forums (for each board design you used) to check for known problems & documented fixes (and if there are any that apply, proceed with those fixes).
2 - Double check that every part is the correct family of the part type (eg. 74F, 74S, 74LS, etc.), and installed in the correct orientation.
3 - Double check that every solder joint has been made - since a skipped solder joint is easy to miss, do this a few times with each board, in different orientations with different lighting angles.
4 - look carefully for IC pins that are not in their socket... eg. bent under the chip, or outside of the socket. Pins bent under are often hard to see, so again look at different angles, preferably with magnification.
Do the above (1, 2, 3, 4) for every board:
A - CPU Board
B - I/O Board
C - Memory Board
D - Motherboard
You can print this table and add a checkmark for each item completed:
Examine Board 1 2 3 4 A CPU Board _ _ _ _B I/O Board _ _ _ _C Mem Board _ _ _ _D Motherboard _ _ _ _
So you have 16 things to do. A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4.
After you have completed those 16 easy things, then the long and difficult troubleshooting process can begin.
Please point at the parts of this message that are not clear.
aihk:
--- Quote from: sigma7 on April 08, 2025, 01:36:41 pm ---
--- Quote from: aihk on April 08, 2025, 11:15:38 am ---(I) don't know where to start
--- End quote ---
Troubleshooting an electronic circuit that has never worked in the past can be extremely time consuming and difficult.
To not waste time, it is important to search for the common problems that can be found just by looking.
Do these things first:
1 - Carefully review the sites and forums (for each board design you used) to check for known problems & documented fixes (and if there are any that apply, proceed with those fixes).
2 - Double check that every part is the correct family of the part type (eg. 74F, 74S, 74LS, etc.), and installed in the correct orientation.
3 - Double check that every solder joint has been made - since a skipped solder joint is easy to miss, do this a few times with each board, in different orientations with different lighting angles.
4 - look carefully for IC pins that are not in their socket... eg. bent under the chip, or outside of the socket. Pins bent under are often hard to see, so again look at different angles, preferably with magnification.
Do the above (1, 2, 3, 4) for every board:
A - CPU Board
B - I/O Board
C - Memory Board
D - Motherboard
You can print this table and add a checkmark for each item completed:
Examine Board 1 2 3 4 A CPU Board _ _ _ _B I/O Board _ _ _ _C Mem Board _ _ _ _D Motherboard _ _ _ _
So you have 16 things to do. A1, A2, A3, A4, B1, B2, B3, B4, C1, C2, C3, C4, D1, D2, D3, D4.
After you have completed those 16 easy things, then the long and difficult troubleshooting process can begin.
Please point at the parts of this message that are not clear.
--- End quote ---
My LISA is already running. It feels like there is still a long way to go. Thank you sigma7.
ried:
Congratulations! Nice work 8)
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