9.4 External Circuit
9.4.1 Display
Circuit Principle Diagram
Circuit analysis:
LCD with 4.5 inch FWVGA TFT color screen, using the ZIF connector, LCD digital interface
data line and read, write, chip selection, reduction, data / command control signal line, the digital
interface of LCD is driven by a baseband chip LC1811 LCD controller module (with EMI
suppression filter), the LCD power supply is provided by power chip LC1100, interface voltage is
provided by power chip LC1100.
Fault analysis and treatment process:
LCD showed abnormal causes for the EMI filter weld, solder, solder or solder; lead:
1. White display, Huaping: first confirm the software correctly, LCD good, welding should be no
weld, short-circuit phenomenon, the contact point should be clean, no residual solder paste help
and dirt, finally check CPU, EMI should be no weld, damage etc.. Re welding, or replace the
relevant device test;
2.Display a black screen, no backlight: first confirm the LCD itself and the good welding, LCD
backlight working voltage of VBAT is normal; check the contact point is clean, no residual solder
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