Problem with Lunar Lander

Do you know anyone with an oscilloscope? Needs to be dual trace

If you set up the "x" lead on the PCB x out put and same with the Y lead, you will get a graphic picture on the screen.

If the picture on the scope is the same as your game, then the PCB is faulty

If the picture on the scope is normal, then it's the monitor

My guess, the PCB is the culprit

Time to check:
Power Supply Voltages, connections, dry joints, IC sockets / corroded pins

Usual suspects

Plug in an asteroids board and see if it lights up normal.
U know anyone nearby with an asteroids?

Or plug your board into an Asteroids cab.

A few options :)
 
So.... I hooked it up in Asteroids, and it does the same thing. So I guess there is a wonderful new problem on the PCB.

It was working fine 2 days prior, then this. I am guessing then that something went out component wise. Any ideas where to start? I finally got this game moved up into my arcade, and it lasted for less than 2 weeks.

I will go over the traces and stuff, just to make sure.

Thanks,
Todd
 
Can't view the video, but it sounds almost like a RAM issue I saw once on an Asteroids. You'd see these random streaks of "lightning" across the screen.

Does Lunar Lander have a test mode like Asteroids does? If so, flip the switch and count the beeps.

-Ian
 
So.... I hooked it up in Asteroids, and it does the same thing. So I guess there is a wonderful new problem on the PCB.

It was working fine 2 days prior, then this. I am guessing then that something went out component wise. Any ideas where to start? I finally got this game moved up into my arcade, and it lasted for less than 2 weeks.

I will go over the traces and stuff, just to make sure.

Thanks,
Todd

Ok now we know it's the PCB you can check and clean the removable ICs

Remove the ROMS (Larger ICs) 1 at a time (Make sure you note the position of the dot, so it goes back the same) Use a small screwdriver, alternate from one end to the other, moving a small amount each time. (DO NOT damage/scratch the PCB beneath), just lever underneath gently to get the IC moving. Once it's almost out you can finish it off with an IC remover

Get and eraser or green scourer pad, and clean the legs inside and out, BRUSH AWAY from the pins/legs or they will break (IE from the IC body, towards the sharp part of the leg)

Check for broken legs and if good re insert the IC

Do this for all ICs which are removable

If it does exactly the same problem, then you probably need to put it in to be fixed, unless you have micro soldering experience

Hear from you soon :)
 
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