Redmi 5A FEM Signal Problem

DenBagus Metrix

Active Member
Jul 20, 2019
19
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FEM SIGNAL RX PROBLEM REDMI 5A

REDMI 5 A FEM — Postimage.org

U3101
CLIP ANTENNA

J3101
COAX
THE RAIL : P_TRX_ANT : PORT_ TRANSMITTER _RECEIVER_SIGNAL_ANTENNA
goes to U3301 RF-TR-SKY77912-61 Front-End Module (FEM)

FEM WORKING VOLTAGE :
VCC / VIN = VPH_PWR / VBAT ANALOG
VIO = VREG_L5_1P8 / VREGULATOR_LDO_1.8V
VRAMP = VOLT RADIO AMPLIFIER / 2.8V
RFFE1_DATA = CONTROL RF
RFFE1_CLK = CONTROL RF
HB = HIGH BAND 1800MHz
LB = LOW BAND 900MHz
CPL_OUT = COUPLER OUT to U4001 R4008 R4004
TRX = TRANSMITTER_RECEIVER_SIGNAL
TRX1 =
  • R43 = TRX_B4
  • = TX_B34_B39
TRX2 = - TRX_B41
TRX3 = - TRX_B40
TRX4 = - TRX_B8
TRX5 = - TRX_B7
TRX6 = - TRX_B2
TRX7 =
-R42 TRX_B20
- PRX_B34_B39
TRX8 = - TRX_B3
TRX9 = - TRX_B1
TRX10= - TRX_B5_BC0
CPL_OUT =

WTR0_PRX_LB2_B20 MENUJU U3000-1
WTR0_PRX_LB2_B20
coming out from U3000-1

WTR0_DRXBB_I_P
WTR0_DRXBB_Q_P
WTR0_PRXBB_I_P
WTR0_PRXBB_Q_P
straight to U1101-F RF_INTF SOC MSM8937
out through ROOM GPIO MSM8937 CDC_PDM_RX0
CDC_PDM_RX0



ROOM CDC U0701-A PM8937 POWER IC
out through
PM_EAR_P
PM_EAR_M
come in to RECEIVER SPEAKER

CMIIW
BEST REGARD
DENBAGUS
 
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