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Finally! I found the problem is on the BBU. I bought a new motherboard and tried to "transplant" all the chips. First, ROM and RAM are all good, and I tried the BBU. Before I tried it, I never think the problem will be on this unit, but it definitely happens! This can be a model of these kinds...

OK, I know about the BBU is that it can't be reprogrammed. Thanks for you guys helping😀

As I just mentioned, I have a Macintosh SE, and it has some problems. After one month effort, I found that the problem is about the Gate arrow. I want to find out that if this unit can be programmed, and use what to program it? The pictures is just followed.

Wow, I'll have a look.

You're right, I'll try to find how to start it.

Okok, thanks for your help.

Hi. I just post thread about my broken Macintosh SE... Because of the working-well monitor, I want to try if the CRT can be a monitor that can be used to be AV monitor or something else? Just CRT is the hardest I think. Others can be done easily. I found the schematic and took photo of the yoke...

I think maybe it's not BlueSCSI? But the function is still the same, and it is tested by the seller and works well.

Hi, it's me again.... For last post, I test the power supply carefully, and it finally works well. 5V and 12V both works well. The Macintosh SE DID work. Unfortunately, there's a floppy disk icon with question mark on it. I tried using external hard drive, internal hard drive and floppy disk...

Things, sounds different. After I replace the power supply, check it carefully, and clean the logic board, the floppy disk face with question mark appears again. I restart for a lot, and am sure that nothing will change. However, all the method I tried can't work. Floppy disk, internal hard...

Hi, this is the power supply. It looks well

Are C36 and C34 working well??

Also, the power supply goes well. All CAPs are going well.

HI, I remove pram, but it's still. I determine C36,it's 1.7V, C34 is 0.6V, while two of others are 5V, are there anything wrong.

Wow, thanks, I'll follow your advice. I'll first replace the battery and have a look. Then I'll have a look at the power supply. If there're anything wrong, I'll say and take photos. Thanks :) I think I can remove the speaker and test.

For me, I didn't replace any. But for last buyer, I don't know. However, for the condition when I first open it, I believe nothing had been changed. I'll try replacing them.

This is my motherboard, and I only replaced one gear in the floppy drive's eject motor.

Hi, the internal hard drive doesn't been replaced, I just put the BlueSCSI for an external hard drive

Oh, I also tried to cut down all the connection: floppy disk drive, hard disk, even keyboard and mouse

Hi, I signed up for this forum because of my Macintosh. When time pasts, there're three problems appeared, worse and worse. The first problem is shown on the first image. there're only mouse on the screen, and the inside card disk light is always on, also the BlueSCSI. And I tried to make a...