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机型:创维25NF8800(5T10机心),CPU:SKY-WORTH87CM38N—1N10,单片 IC:TB1240AN。故障现象:蓝屏,无图、无声,有屏显。分析与检修:检查各工作电压正常。I~2C 总线电压正常。进入维修状态检查 I~2C 总线数据,发现总线数据只有27项,怀疑存储器24C08有问题。换上厂家提供的存储器,总线数目为73项,但故障现象不变,说明不是存储器故障。试将原机存储器换回试验、总线项目奇迹般地恢复到73项。是何原因?这是疑问1。检查自检结果,发现自检1的“SYNC”项为红色字符的“NG”(而正常应是绿色字符的“OK”)。自检2的
Model: Skyworth 25NF8800 (5T10 movement), CPU: SKY-WORTH87CM38N-1N10, monolithic IC: TB1240AN. Symptoms: blue screen, no picture, silent, screen display. Analysis and Maintenance: Check the normal working voltage. I ~ 2C bus voltage is normal. Into the maintenance status check I ~ 2C bus data and found only 27 bus data, suspect memory 24C08 problems. Replace the memory provided by the manufacturer, the bus number 73, but the same failure, indicating that memory failure. Try the original machine memory back to the test, the bus project miraculously restored to 73 items. What is the reason? This is question 1. Check the self-test results and found that the “SYNC ” entry for self-test 1 is “NG” with the red character (and “OK”, normally green). Self-test 2’s