Macintosh IIsi display issues.

[toples50]

I have a Mac IIsi but I have no picture when connected to a monitor with an adapter.I have startup sound disk spinning but no display.Everything seems to work except display.

Have to recap it or not?What about the PSU?

 

[Johnnya101]

Definitely needs recap, and IIsis are known to need new psu caps too

 

[netfreak]

If you're talking about using a Mac->VGA adapter on it, you need a monitor that supports "sync on green." Not all do and I ran into this exact problem with mine.

 

[toples50]

If you're talking about using a Mac->VGA adapter on it, you need a monitor that supports "sync on green." Not all do and I ran into this exact problem with mine.

OK thanks! But needs recapping as soon as possible.

 

[Zippy Zapp]

I had the same problem and for me it was indeed the adapter I had.  As pointed out you need a monitor that supports Sync on Green but you also need to make sure the adapter supports SOG too.   I have a Sony CPD 17" that does support it and it came with and Mac adapter that does not. Sony monitors were popular with Macs back in the day. NEC also made monitors that seem to support Mac on some models.    The adapter I ended up digging up was one that had dip switches and specifically supported Sync on Green.

 

[toples50]

Worked fine with Samsung monitor! -Thanks guys- The only issue that I have now is that sometime the machine does not shut down.Perhaps needs recapping...

 

[Johnnya101]

Yes, for sure. Both the PSU and logic board

 

[netfreak]

Worked fine with Samsung monitor! -Thanks guys- The only issue that I have now is that sometime the machine does not shut down.Perhaps needs recapping...

Yeah one sign I had on a machine prior to recapping was it would power itself on as soon as power was applied. It worked properly after the recapping. This was just the board caps too. My PSU still seems ok.