Cpc+ repair help needed

[spybro]

as you can tell from the title i have a problem with my cpc+
when i fire it up i get this






I get no sound hitting backspace


I have cleaned the contacts in the cartridge and cpc+ plus socket
tried other cartridges
Tested Z80 on one of my other pluses works fine


any help is welcomed

[Devilmarkus]

I had a similar problem.
Re-soldering the cartridge slot helped here.

[spybro]

Re-soldering the cart???
im only good in making basic soldering   


any hints on testing that scenario before taking action?

[Devilmarkus]

Well, not resoldering the cartridge!
Re-solder it's slot (the upcoming PCB from + main PCB and the contacts on the main PCB itself.

To check this?

Well do you also get sometimes a yellow screen with a few stripes on it? (Perhaps also with blue content and yellow stripes)

To check it: Insert the cartridge, press it a bit down and power on the CPC.
Is the result better?
Then try to pull it a bit upwards, power the CPC on again etc.

Edit: Every TV repair shop could re-solder these contacts for you and I am sure it wouldn't be too expensive!

[spybro]

Well, not resoldering the cartridge!
Re-solder it's slot (the upcoming PCB from + main PCB and the contacts on the main PCB itself.

I understood
I just didn' used the whole phrase

Well do you also get sometimes a yellow screen with a few stripes on it? (Perhaps also with blue content and yellow stripes)

To check it: Insert the cartridge, press it a bit down and power on the CPC.
Is the result better?
Then try to pull it a bit upwards, power the CPC on again etc.

I have tried the up/down thing and i get all kinds of artifacts screens
some with stripes
others take over the whole screen

[Devilmarkus]

Then, my first step would be to re-solder the socket

[arnoldemu]

as you can tell from the title i have a problem with my cpc+
when i fire it up i get this






I get no sound hitting backspace


I have cleaned the contacts in the cartridge and cpc+ plus socket
tried other cartridges
Tested Z80 on one of my other pluses works fine


any help is welcomed

I can't say for definite on this one, because I don't know what parameters are used by the Plus equivalent of the CRTC are.. but from the picture I think:

1. The CRTC is running, because the screen size is correct and positioned well.
2. The Z80 must have executed something from the system cart to do this.

Possibilities here:

Bad ram
Bad communication between ASIC and ACID (Markus' suggestion).

But I can't say for definite.

Try removing and re-seating the z80.
EDIT: Forget that it looks like it's not socketted.

[spybro]

as i wrote in my first post i have removed and re-seatead the Z80
i also tested it on one of my others cpc+ and works fine


Is there an easy way to test the ram?

[Bryce]

I get no sound hitting backspace

Is the sound output connected? Otherwise you won't hear anything anyway.

My bet is also the cartridge to ASIC connections, try cleaning the contacts and checking for bad solder joints.

Did it suddenly break after working normally? Or did you get it in this condition?

Bryce.

[Gryzor]

What's that brown thing on the right? Looks like a leak in your monitor??