My MBSid and my first problem

MIDIbox SID
1

Hi,

I’ve started to build a MidiBox Sid. The core is working fine (I can upload application, the lcd is working).

I 've plugged the sid module and checked the voltages, all OK.

So I put the ICs in the socket. The LCD doesn’t display anything but I still can upload application. I’v try removing the ICs and when I removed IC3 my LCD is working again.

I’ve no idea where the problem is, i’ve no short or cut in the PCB.

If anyone know how to solve this problem.

Buryplo

2

IC inserted the right way round?

check the connection between the SID-Pcb and the CORE-Pcb.

3

The IC are in the right way and the SID Mdule is right connected to the core

4

The IC are in the right way and the SID Mdule is right connected to the core

how can you be that sure?  ;D

does the SID output any sound?

/ edit:

how have you connected the Display? can you post a link to the schematic you used?

/edit2:

welcome aboard, btw  ;D

5

I use this schematic http://ucapps.de/mbhp/mbhp_lcd_4bit.pdf and left D0/D3 unconnected.

Should I connect them to ground???

The strange thing is that the lcd works until I connect sid module’s IC3

Buryplo

6

http://ucapps.de/midibox_sid/mbsid_v2_communication.pdf

do you have the Diode and the 1k Resistor like shown here?

have you tried to exchange IC2 and IC3? perhaps one of them is damaged.