According to the symptom analysis, the first non-character display processing failure. Characters appear to be normal aircraft shall meet the following requirements: CPU (TMP47C1238ANU068) equipped with on-screen circuit, including its character oscillator {39} {40} feet connected LA02 (TRF1166D) is working properly, CPU {37}, {38} foot line input, the vertical blanking signal is normal, {32} {33} {34} {35} and foot screen driver output circuit working properly constituted. The inspection found that CPU {37} feet without line blanking signal input, processes the signal is: T46110 foot → C444 → R245 → RA41 → VQB01 → CPU {37}

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