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LG LG400GT Service Manual
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LG LG400GT Service Manual

LG LG400GT Service Manual

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Internal Use Only
Service Manual
LG400GT
Date: January, 2008 / Issue 1.0

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Summary of Contents for LG LG400GT

  • Page 1 Internal Use Only Service Manual LG400GT Date: January, 2008 / Issue 1.0...

  • Page 2: Circuit Diagram

    UART_RX ON_SW RPWON ON_SW VBAT VBAT TP122 RPWON URXD TP123 UTXD UART_DSR OJ100 OJ101 OJ102 OJ103 UART_RTS UART_CTS - 71 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 3 KB214 KB215 RIGHT SEND KBR(3) CLEAR KB216 KB217 KB218 KB219 CLEAR DOWN KBR(4) KBC(0) KBC(1) KBC(2) KBC(3) KBC(4) - 72 - LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 4 VA308 C326 C327 R328 R329 C308 C309 C310 C324 4.7u 2200p 0.1u 100K 100K C328 (2012) (10V,Z,Y5V) (50V,J,NP0) - 73 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 5 6.8nH L411 MODE ANT_SW1 ANT_SW2 PT400 R410 850/900 TX 270K 1800/1900 TX 850/900/1800/1900 RX R411 TEMPSENSE R412 4.7K - 74 - LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 6: Indicator Leds

    SPK_RCV_P LCD_RESET _LCD_CS SPK_RCV_N _LCD_WR MLED LCD_RESET MLED1 LCD_ADS MLED2 MODE MOTOR_P SPK_RCV_P SPK_RCV_N BACKUP BATTERY V_BACKUP BAT1 - 75 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 7 - 76 - LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

  • Page 8: Bga Ic Pin Check

    8. BGA IC Pin Check 8. BGA IC Pin Check 8.1 DBB (U101: D6591BUZPH) NOT IN USE 8.2 ABB (U100: T3031FZPH) Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only - 77 - Only for training and service purposes...
  • Page 9 8. BGA IC Pin Check 8.3 Memory (U202: S71VS064KB0) NOT IN USE LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. - 78 - Only for training and service purposes...

  • Page 10: Pcb Layout

    9. PCB LAYOUT - 79 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 11 No Booting No Sound No Service No LED No Display U300 Charging IC U202 Memory No Charging No Booting - 80 - LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...
  • Page 12 9. PCB LAYOUT - 81 - Copyright © 2007 LG Electronics. Inc. All right reserved. LGE Internal Use Only Only for training and service purposes...
  • Page 13 9. PCB LAYOUT - 82 - LGE Internal Use Only Copyright © 2007 LG Electronics. Inc. All right reserved. Only for training and service purposes...

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