LGE Internal Use Only
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
TU550 have a protective circuit for booting from USB. When the phone is booting from USB_VBUS
without Battery, booting current is insufficient. Sometimes that can break the USB port of a computer.
For this reason, TU550 do not support booting from USB.
3. TECHNICAL BRIEF
- 50 -
Figure. Schematic of USB block(MSM6275 Side & PM6650 Side)
Figure. Schematic of USB protective circuit
UART2_DP_TX_DATA_GPIO88
F4
UART2_RFR_N_GPIO91
L23
UART3_CTS_N_GPIO86
UART3_DP_RX_DATA_GPIO85
M21
M19
UART3_DP_TX_DATA_GPIO84
N26
USB_DAT_VP
USB_OE_TP_N
N25
N23
USB_SE0_VM
UART2_CTS_N_GPIO90
G6
E4
SBCK
L21
SBDT
J23
SBST
H26
MMC_CLK_SDCC_CLK_GPIO31
M16
H14
MMC_CMD_GPIO30
MMC_DATA_SDCC_DAT0_GPIO32
L14
F7
GPIO39
D6
GPIO40
GPIO42
D7
GPIO44
GPIO64
F14
PM_SBDT
PM_SBCK
PM_SBST
PM_INT_N
PS_HOLD
MMC_CMD
UART_DTR
UART_DCD_N
UART_RI
USIM_DATA
USIM_RST_N
USIM_CLK
USB_SE0
USB_DAT
USB_OE_N
RF_SBST
RF_SBCK
RF_SBDT
MMC_DATA(0)
MMC_CLK
20
GP1_DRV_N(MPP7)
21
LCD_DRV_N
22
KPD_DRV_N
23
KPDPWR_N
24
25
13
VSW_5V
14
USB_CTL_N
15
USB_VBUS
16
USB_DAT
17
USB_D_P
18
USB_SE0
19
USB_D_M
USB_ID
VREG_5V
12
USB_OE_N
4.7u
smd_1608h_9_r
C324
2.2K R306
USB_VBUS
USB_OE_N
USB_DAT
USB_D+
USB_SE0
USB_D-
Summary of Contents for TU550
Page 1: ...Date May 2007 Issue 1 0 Service Manual Model TU550 Service Manual TU550 Internal Use Only ...
Page 185: ...Note ...
Page 186: ...Note ...