Need help with messed up C128...

From: Mikael Holm (
Date: 2003-02-07 09:08:40

Hej Allihopa...

I just received a C128 (220v PAL) and when I powered it up it just 
displays garbage on screen. All it displays is some random graphics (not 
really characters, but rather strange patterns) with different text and 
background colors. And all this is flashing and changing. And it won't go 
to C64-mode when I hold down the C=-key while turning the power on.

Anybody got any ideas as to what may be the problem?

I got the following from Ray Carlsen's trouble shooting/repair-site 

U11       315012-01 (8721) PLA (Programable Logic Array) 
     No bootup in any mode. In 40 columns: blank screen, white screen, 
light blue screen (no border), random checkerboard pattern or flashing 
"garbage" characters. 

U18       390059-01 CHARACTER ROM
     No characters. Startup has border, but "garbage" where characters 
belong, or entire area inside border just lines or blocks. 

Could that be the problem? With the flashing I would think that it is the 
U11 problem? What dou you think? 

Do you think it can be fixed? Any hint to how? If it is the PLA that's 
faulty, where can I find a new one? And how do I make sure it really is a 
bad PLA?

// Mikael
Mikael Holm

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