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IBM PC XT Troubleshooting Guide
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== No-beep / No-video Diagnostics == # Confirm '''+5 V''', '''+12 V''', '''−5 V''' and '''−12 V''' at the P8/P9 motherboard connector with the machine running. # Reseat '''U18 and U19 (BIOS)''', the '''8088 CPU''', and all of bank-0 RAM. # On a 1986-dated BIOS, a failed U19 produces a silent dead motherboard (because U19 carries part of the BIOS, not just Cassette BASIC). Try a known-good U19 from another XT or burn a fresh EPROM. # Probe the '''8088 clock (pin 19)''' and the '''reset (pin 21)'''. # Piggyback a known-good RAM chip on each bank-0 position in turn.
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