Difference between revisions of "PCB Repair Logs Missle Command"
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'''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/4723-Missile-Command Missile Command PCB Repair]<br> | '''Forum Thread:''' [http://www.aussiearcade.com.au/showthread.php/4723-Missile-Command Missile Command PCB Repair]<br> | ||
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% | |||
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[[PCB_Repair_Index|Back to PCB Repair Index]] | [[PCB_Repair_Index|Back to PCB Repair Index]] | ||
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%
