Apple IIc blinking power light

[bibilit]

This is due to bad ram chips probably 

one or more chips imho. 

Piggybacking new ones can help 

 

[Arths]

Might be a possibility, RAM chip are MT4264 right ?

I've read online that I can also use 4164 chips.

 

[bibilit]

Yes 4264-15

 

[Arths]

Yes 4264-15

Mine uses TMS4164, must be an early revision of the IIc.

According to this site, they should be compatible anyway.

Ordered five chips from AliExpress, they should arrive in 2 to 3 weeks.

Thanks for your advice  

 

[Arths]

Hi guys,

Just received the chips, tried piggybacking but that doesn’t seem to change anything.  :/

Maybe there are specific chips I shall try this method on ?

If you have any idea, please let me know :'(

Thanks

Edit : Piggybacking F18 makes horizontal white bars but that's it

Arths

 

[bibilit]

Problem is you can have more than one faulty unit. Sometimes not easy to troubleshoot, but a slight change can indicate the faulty chip

 

[Arths]

Problem is you can have more than one faulty unit. Sometimes not easy to troubleshoot, but a slight change can indicate the faulty chip

I’ve changed chip F18 and I now have solid horizontal white bars. Another thing is that I seem to loose composite signal every 2 seconds, maybe a clock issue ?

 

[bibilit]

Have you tried the piggybacking procedure once more  on the remaining chips ? can be frustrating but again more than one chip can be bad.

 

[Arths]

Absolutely, but that did not change anything