CPC 464 - Will not boot

[antpant7]

Hello, I have recently purchased a CPC 464 from Ebay. When I turn on the 464 I am getting a pink garbled screen with low volume noise from the speaker.



Pressing the DEL doesn't produce a Beep.


I have am using a 5v 3amp power supply (3rd party).
The board revision is MC0044d


Hoping someone may have experienced the same thing and found a solution.


Thanks.


Antony Myers.

[Bryce]

Hi and welcome to the forum,

You've defintely got a 464 with a failed RAM chip. You need to find out which chip has failed and swap it out. If that's beyond your ability, then let us know.

Bryce.

[antpant7]

Hello Bryce, thanks for the warm welcome to the group.


I have piggy backed some km4164b ram that I had spare from repairing a C64.


Managed to get the CPC464 to boot, i will now solder in an IC Socket and replace the km4164


Thanks a million for your quick and accurate diagnostic 


Next job for me is to strip down the tape unit and give it a good clean and re-grease .


Will post a pic of the finished results when its done !!

[Bryce]

Congrats. That was a quick repair, but if you've already swapped RAM on a C64, then you probably know what you're doing (we won't talk about the fact that the C64 got fixed first or your retro computer tastes  ).

Bryce.