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例1 故障现象:一台长虹 D2526A 彩电,开机后屏幕出现蓝色背景。屏幕上有字符“SYS-2、9”字样,用遥控器控制电视机能动作,但瞬间又回到当前“SYS-2、9”状态,即整机被锁死在“SYS-2、9”状态。分析与检修:初步判断为误码,应重点检查控制系统,首先对 CPU 正常工作的条件进行检查,CPU 的供电及复位电压均正常,用代换10 MHz 晶体的方法检查时钟振荡也正常。检查总线电压也正常,于是检查本机键
Example 1 Symptom: A Changhong D2526A color TV, the screen appears blue background after powering on. The screen has the character “SYS-2,9 ” words, with the remote control TV can act, but an instant back to the current “SYS-2,9 ” state, the machine is locked in the “SYS -2,9 ”status. Analysis and Maintenance: The initial judgment of error code, should focus on checking the control system, first of all to check the conditions for normal CPU work, CPU power supply and reset voltage are normal, with the replacement of 10 MHz crystal method to check the clock oscillation is also normal. Check the bus voltage is normal, so check the local key