(No.RA018)1-95Checking the output signalfrom the MPU/DSP.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When an abnormalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.When a normalvalue is confirmed.The LCD displays controlIt is unlikely that the BGA parts are broken.Points to be checked Normal voltage/RESET (LCD_RST)CN9 (11 pin)1.8VPoints to be checked Normal voltage/CS_F IC706 (4 pin) 1.8V 0V 1.8V,Points to be checked Normal voltage/CS4 CN9 (10 pin) After power-on, and/CS4 has an abnormal voltage.Check each of the following items.Check to see the terminal of L802.Re-insert the FPC of LCD module.Replace the LCD module.As a result, if the abnormality yet, the MPU/DSPor Flash memory or mobile DDR may be broken.Remove Q800.If the MPU/DSP side is 3.3V,the MPU/DSP, Flash memory or mobile DDRmay be broken.Points to be checked Normal voltage30M IC80 (1 pin) 3.0VThe BGA parts are not broken.Remove R867 to check the voltage of the 30M.If the voltage becomes normal, re-insert theFPC of LCD module or replace the LCD module.The LCD display “INIT ERROR 1”. An error occurs when the mobile DDR internalRAM reads or writes.The mobile DDR may be broken.1) /RST : MPU/DSP reset signal LOW Reset2) /BINT : Battery final voltage monitoring LOW Final voltage3) /PSW : Power switch signal LOW ON4) /FRST : Flash memory reset signal LOW Reset5) /CS_F : Flash memory chip select signal LOW Active6) SBC : Switch +B control HIGH ON7) 30M : LCD module control 3.0V power supply8) /RESET (LCD_RST) : LCD reset signal LOW Reset9) /CS4 : LCD controller chip select signal LOW ActiveAfter power-on, and1.8V fixed later1.8V fixed laterIf the IC706 (1 pin) is 0V or 1.8V, the MPU/DSPmay be broken.If the IC706 (2 pin) is 0V or 1.8V, the MPU/DSPor Flash memory may be broken.When a normalvalue is confirmed.Points to be checked Normal voltageSBC MPU/DSP side R21 3.3V Remove the following parts.C47R21R39R66Q32IC36IC61If the MPU/DSP side is 0V, the MPU/DSP orFlash memory or mobile DDR may be broken.1.8V 0V 1.8V,When a normalvalue is confirmed.When an error display appears on the LCD
