Macintosh Portable

[mactjaap]

New! In briefcase and with adapter. A Macintosh Portable M5120.

Wil try to startup, but first check....how... I think I need an extra adapter for the missing battery ( it MUST be dead after so much years...). I have a 9V 1000mA one to connect in the battery compartment.... would that be OK?

See this picture:



See more pictures:

 

[matacao]

For testing my Macintosh Portable I have connected an external 6V battery with new Pram Battery but not the Power Supply. Be careful to connect the positive pole on the positive pole and negative pole on the negative pole because there is no protection.

 

[unity]

Wow, for a second I thought new as in brand spanking new. That would have been crazy.

You will want to pull the mobo and clean it. I have yet to see a portable that did not leak caps. In fact a few had wet spots on the mobo from gap leakage! The only board that did not was a new board I bought.

 

[uniserver]

i like the hand made pcb for the 34 to 50 pin scsi adaptor!

 

[haplain]

Wait so I'm looking here and I see your m5120 but in a pic it looks like it has a backlit screen but doesn't have a backlight upgrade kit. Or, am I see thing?

 

[unity]

There are pics here from two different users. The lower being backlit machine. Or am I mistaken in what you are seeing Hap?

 

[haplain]

Explains it

 

[techknight]

That sorta looks like my test setup, but much crazier in the event I am using a benchtop adjustable power supply. 

 

[matacao]

@uniserver: I have made this hand made 34 to 50 pin scsi adaptor because the previous owner had destroyed the HD connector.

@haplain: effectivly @mactjaap Macintosh Portable is a M5120 (non-backlit) and mine is M5126 (backlit) but everything else is the same in M5120 and M5126.

@techknight: When I did this test, I had only an external 6V battery on hand but it works perfectly.

Mactjaap can do a test with an external 6V battery or an adjustable power supply.

 

[mactjaap]

Thanks matacao.

I have a 6v 1000mA adapter. Would that work too?

 

[matacao]

6V would be work but I don't know if 1A is enough.

Edit: Original battery are 3x 2V 5.0 AH (Cyclon) --> 6V 5.0AH, I think that 6V 1A power supply can match.

 

[Charlieman]

Trickle charge the original lead acid battery. 30 minutes on charge, 30 minutes off. Use a meter to check voltage across the poles to see if it is charging. Repeat for six hours. Is the battery recovering? Is it taking a charge? I think I wrote about this years ago on 68KMLA, so try a search.

 

[techknight]

1A is not enough. You need about 2 amps

 

[mactjaap]

OK! I'll have top wait. I do not have 6V 2A in the house. 6V 1A is the best.... to be continued.

 

[mactjaap]

What about 5V 2A? Will that work? Thats what I can deliver. If not I will buy one with correct values.

 

[matacao]

For a correct operation I think that 5V will be short. 

 

[mactjaap]

I gave it a try with the 6V. Also attached a 9V PRAM battery. Nothing. Absolutely nothing happens. So, I will try definitely a 6V 2A one.

 

[matacao]

For my test, the Mac have started after 10 minutes

 

[techknight]

Cant use 5v. Undervoltage lockout kicks in at 5.7v