U2401 has two circuit power supply, all the way PPIV8-GRAPE of 1.8V power supply comes from power source IC-U1202, in capacitance C2403 can be measured, all the way PP5V1-GRAPE-VDDH of 5.1V power supply comes from U1501, feeling IC-U2402 has 3 power supply, PP1V8 is 1.8V comes from power source IC-U1202, PN5V7-SAGE-AVDDN comes from U1501PP5V7-SAGE-AVDDH to be ＋ for 5.7V 5.7V and - 5.7V, these two voltage should be in PP1V8-GRAPE and PP5V1-GRAPE-VDDH to feel the case with good IC to issue ability to measure in vain get, if white feeling IC is abnormal, do not have 5.1V, if measure,be less than 5.1V that is to say, not be the problem of power supply IC-U1501 certainly, white feeling also can be caused without 1.5V. The area that tell a state 10 thousand amount to D of edifice of square all places 9 13 rooms
Be in a poor light from 3 when U1502 outputs the lamp controls signal to pass inductance FL2024 respectively, FL2025, FT2026 sends indication screen interface J2019, among them PP-LCM-BL-ANODE-CINN is be in a poor light the positive electrode power supply of the lamp (the front line that is equivalent to floodlight) , the voltage of positive electrode power supply is over 16V~22V, how much does specific voltage want to see brightness, if be moved the brightest it is 22V left and right sides, lamplight is moved the darkest be over 16V left and right sides. PP-LCM-BL-CATI-CONN and PP-LCM-CL-CAT2-CONN are be in a poor light the signal of negative pole loop of the lamp (the 0 lines that are equivalent to floodlight) , the loop signal that has two negative pole makes clear have group be in a poor light the lamp, PP-LCM-BL-CATI-CONN and PP-LCM-BL-CAT2-CONN have among them can cause normally all the way all the way be in a poor light the lamp does not shine incorporate does not shine at the same time at the same time to show screen has screen of yin and yang of person of all corners of the country. Appear such breakdown is checked above all short receive FL2025 FL2026, if not be the problem of inductance, that is the problem that the lamp controls IC-U1502, because tear open outfit U1502 to compare a trouble, can receive two road weak point can.
Be in a poor light the lamp IC-U1502 also is the working status that is in tall voltage big electric current, also be easy attaint, cause have show without lamplight! Because PP-VCC-MAIN offers here continuously, this IC attaint still can cause the leakage of electricity that append report to perhaps add electric big electric current not to switch on the mobile phone, inductance L1503 and dynatron D1501 easy attaint cause outfit screen to switch on the mobile phone big electric current does not have lamplight!
From the PP1V8 that power source IC delivers and the PN5V7 that deliver from U1501, PP5V7 is passed respectively.
