Difference between revisions of "PCB Repair Logs Missle Command"
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OK, won a Missile Command off ebay, description said parts pcb, but anyway. | OK, won a Missile Command off ebay, description said parts pcb, but anyway. | ||
OK Recieved the pcb, quick look, missing the crystal 3 eproms 2 eprom sockets and the cpu. | OK Recieved the pcb, quick look, missing the crystal 3 eproms 2 eprom sockets and the cpu. | ||
Burnt 3 new roms and installed 2 sockets, put a good cpu and crystal in, changed all the 4116 rams (I bought a few nos off ebay) Fired it up, yellow screen. | Burnt 3 new roms and installed 2 sockets, put a good cpu and crystal in, changed all the 4116 rams (I bought a few nos off ebay) Fired it up, yellow screen. | ||
OK, time to have a better look, ended up straighting all the pins on the back of the pcb that where touching, tried again, now a white screen and reseting, better. | OK, time to have a better look, ended up straighting all the pins on the back of the pcb that where touching, tried again, now a white screen and reseting, better. | ||
Try the test mode, goes into it, give a rom 2 error sometimes. Verfy the rom, nothing, resolder the socket, nothing. | |||
Try the test mode, goes into it, give a rom 2 error sometimes. Verfy the rom, nothing, resolder the socket, nothing. | |||
Check the rom addressing ciruit, found a bad 74ls42 at N2 and a bad 74ls153 at F3. Changed with new chips, voila, working Missile Command | Check the rom addressing ciruit, found a bad 74ls42 at N2 and a bad 74ls153 at F3. Changed with new chips, voila, working Missile Command | ||
But, seems to have the yello background missing, odd, will get the schematics and have a look. | But, seems to have the yello background missing, odd, will get the schematics and have a look. | ||
Revision as of 07:03, 15 August 2012
Missile Command
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| PCB Image | reserved |
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| Pin Out | Reserved |
Repairer: Prof
Forum Thread: Missile Command PCB Repair
OK, won a Missile Command off ebay, description said parts pcb, but anyway.
OK Recieved the pcb, quick look, missing the crystal 3 eproms 2 eprom sockets and the cpu.
Burnt 3 new roms and installed 2 sockets, put a good cpu and crystal in, changed all the 4116 rams (I bought a few nos off ebay) Fired it up, yellow screen.
OK, time to have a better look, ended up straighting all the pins on the back of the pcb that where touching, tried again, now a white screen and reseting, better.
Try the test mode, goes into it, give a rom 2 error sometimes. Verfy the rom, nothing, resolder the socket, nothing.
Check the rom addressing ciruit, found a bad 74ls42 at N2 and a bad 74ls153 at F3. Changed with new chips, voila, working Missile Command But, seems to have the yello background missing, odd, will get the schematics and have a look.
Okay, found the problem with the missing yellow mountains, bad 7474 at A7, replaced with a good one and now running 100%
