ger_marsh
Registered
Hello to you all,
I am new here so please excuse my ignorance. I searched this forum but could find nothing like this problem.
Neighbour has asked me to look at a problem with a Jurassic Park pin which they have had for some time. I suspect it has not worked for some time too!
On starting up, most lights illuminate ok but the display only shows a strange pattern. There are no lit LED's on the CPU board too which I assume must be pretty fatal. This is what the display shows:

There was a burnt out connector which was preventing half the backglass lights working but that was easily sorted with a connector block. Lots of current over lots of hours I suppose.
However, there is some scorching on the CPU board above a column of resistors:

I checked the resistors and they are all within tolerance.
The display controller had a very loose connection for 5V and Gnd and removing the connection completely resulted in the same display! (Actually, I should have checked the voltage on that - perhaps it is not working at all.)
Sorry for the quality of the images - old mobile phone!
If anyone has any ideas, I shall be grateful. I will check the voltages coming on the board today or tomorrow.
(I am new to the fully solid state machines - I fixed up my old EM machine quite easily and that was completely dead when I bought it.)
I am new here so please excuse my ignorance. I searched this forum but could find nothing like this problem.
Neighbour has asked me to look at a problem with a Jurassic Park pin which they have had for some time. I suspect it has not worked for some time too!
On starting up, most lights illuminate ok but the display only shows a strange pattern. There are no lit LED's on the CPU board too which I assume must be pretty fatal. This is what the display shows:

There was a burnt out connector which was preventing half the backglass lights working but that was easily sorted with a connector block. Lots of current over lots of hours I suppose.
However, there is some scorching on the CPU board above a column of resistors:

I checked the resistors and they are all within tolerance.
The display controller had a very loose connection for 5V and Gnd and removing the connection completely resulted in the same display! (Actually, I should have checked the voltage on that - perhaps it is not working at all.)
Sorry for the quality of the images - old mobile phone!
If anyone has any ideas, I shall be grateful. I will check the voltages coming on the board today or tomorrow.
(I am new to the fully solid state machines - I fixed up my old EM machine quite easily and that was completely dead when I bought it.)