May 2014
Intermediate to advanced
320 pages
13h 41m
English
Content preview from Servicing Personal Computers, 3rd Edition
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Servicing 68000-based microcomputers 283
The following symptoms and probable causes should assist readers in fault location:
Symptom Probable causes
Black screen Power supply failure, failed video processing, ULA, clock or bus control chips
White screen Video shifter, ULA, memory controller, DMA controller, CPU
Vertical bars RAM, memory controller, video processing
One colour missing Video summer, buffer, video processing
Random screen data ULA, memory controller
No TV output Failed modulator
Disk refuses to boot Disk drive faulty, power supply, FDC, DMA controller or ULA failed
Disk cannot be formatted FDC, DMA controller, ULA or disk driv ...