Milen
New Member
I have this computer, it have hardware problem, probably in main CPU. There is the 5V VCC and crystal oscillator works, but there is no any impulses on the other pins of the chip. There is contrast regullation only of the half display, probably caused of the un-working CPU, I think there is no problem in the LCD module. I try to unhook the whole reset circuit, but I am not shure that was the reset circuit, so I need datasheet or pinout of the CPU... Also I desoldered all the via connections between the layers of the main PCB, there is no result...
The TI-74 inside:
The TI-74 inside: