<SOLVED> Classic II Boot

[Willj]

Well now that I have the chime and happy face after a trace repair of pin 15 egret reset and pin 5 on U14 memory 5v missing.
It will start the boot get to the welcome screen and lockup. Stays there.
Anyone have any ideas what to check, try etc?

 

[retr01]

Hi @Willj!

Can you post pictures of the area where you repaired the board?

 

[Willj]

Hi @Willj!

Can you post pictures of the area where you repaired the board?

Here are some pics. Also showing the screen. The memory spot I don’t have a picture for right now. This one in the area of the battery that was removed. It was very clean there so I was surprised to find damage there.

 

[retr01]

Yeah. It doesn't look good. The first two pictures are blurry, so I need the pictures' well-focused close-up.

 

[Willj]

Here some better.

 

[retr01]

It looks like the trace is still not connected. I also saw possible weak solders on the chip pins nearby at U12 and U15. I also noticed scratches on two traces near the hole in the vicinity.

If you want it redone correctly, I recommend reaching out to Tom at @AmigaOfRochester. He would be a great guy to help you.

Cheers!

 

[Willj]

The reset trace is connected which allows the board to chime and come up. Before connecting this, I had nothing but a tight vertical bars in center of screen and no chime.

i have redone the solder connections for U12/15. The scratches are surface with good continuity on the trace still.

will keep hammering at it.
Tom has commented and provide assistance from other posts on this. I can’t send him board as he very busy and I am international.

 

[retr01]

Ah. Okay. Yeah, Tom is busy. @Mac84 and @Branchus are also very busy.

Okay. That is excellent news that you found the continuity is good where the scratches are. Keep checking as that would help to see where the continuity cut off.

 

[Willj]

All day I have been working to find out why the Classic II won’t boot up to OS. Loads and then freezes on welcome screen. BUT if I load the system recovery disk image with my external blueSCSI it boots up fine.

I went as far as partition format and install 7.1.1 on the internal hard drive with all the updates all from the system recovery image. Go and boot again without blueSCSI with the new install and same dang thing!!! Freezes on welcome screen. Ugh!!! I think was the scsi internal port as it had bad connections on the board so I flowed them again. Made sure all of them good and solid. No difference. I did this as I notice the board bends a lot when pushing on the scsi cable.

Anyone any ideas, suggestions or can provide some assistance as I am not very familiar with all the Mac software. Below pics of it working and with the internal hard drive and all no want to boot. Even other blueSCSI ages will not load. Only the recovery image will load. Why????? @AmigaOfRochester @Mac84 @jcm-1 you all have any suggestions??

 

[retr01]

Hey @Willj, I just remembered something. The Classics can boot from ROM. That is another thing you can do is do the following keystroke at boot up:

Command-Option-X-O

That forces the Mac Classic to boot from ROM. If it works, then it is the hard drive that could be formatted and tried again with a fresh installation of System software.

 

[Willj]

This a Classic II.

 

[retr01]

You're right.

With a tweak to the ROM in the Classic II, it can boot from ROM. That's another story about the Classic II ROMDisk.

I understand that you tried formatting the internal HDD and did a clean install of the System 7 software, and it still did not work out. Since you can use BlueSCSI externally and format the internal HDD, the SCSI bus and chip should work internally and externally.

I am wondering, why did you partition? Why not the whole internal HDD?

 

[Willj]

You're right.

With a tweak to the ROM in the Classic II, it can boot from ROM. That's another story about the Classic II ROMDisk.

I understand that you tried formatting the internal HDD and did a clean install of the System 7 software, and it still did not work out. Since you can use BlueSCSI externally and format the internal HDD, the SCSI bus and chip should work internally and externally.

I am wondering, why did you partition? Why not the whole internal HDD?

I did partían for the entire drive. I used to windows old days needing to do that first then formar and install. I use the entire drive for the OS.

 

[Willj]

What has worked. Boot recovery on blueSCSI. Formar hard drive. Copy the needed files from recovery to hard drive. The system folder and all the other needed items to boot. Any install I do does not work.

 

[Willj]

Now I am shocked. I made floppies for 7.0.1 and boot from that to install onto the HD. Well it also freezes on the welcome screen. This can be 1 of 3 things. Bad scsi stiuff. Bad hard drive. Bad rom.

 

[Willj]

Today I spend the day checking traces again using the schematic and going chip by chip. I had a feeling it was scsi related to I started there on the scsi/scc/via chip going to the others. I came to pin 64 that goes to 125 on the eagle chip. This trace is for the CE1 that is needed to enable the even numbered address bytes. Without this, system was acting very strange and preventing drive access and other systems to install properly. I was getting other errors that also made me go check rom traces and pins in the sockets. By checking them with the meter and probe, I accidentally pushed some of the metal springs inside to be bigger. I had to remove the plastic cover after a little heat and bend the springs back and returned to plastic covers. Put the rom chips back and all was good. With the trace fixed, rom sockets good, I got my chime back and system booted with no issue to any image I gave it from blueSCSI. To test floppy, I have. 7.0.1 on floppy so installed it that way. All worked very well. I had great support from @jajan547 on 68KMLA and he is here also. In these pics, the board is dirty and has UV mask in various places. The best part, I learned a lot here and a classic II is now saved. The adventure continues……. Oh I want to add this trace is in the bottom edge of a capacitor battlefield so no wonder it went. I had 2 broken traces total on this board. Not so bad.

 

[retr01]

High five, @Willj!

Cheers!

 

[jcm-1]

Sorry I missed this awesome thread. All I can say is: Great job!

 

[Willj]

Sorry I missed this awesome thread. All I can say is: Great job!

Thanks. Your teachings and those of @Mac84 @Branchus gave me the guidance and will to find it. Many more to come.