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RF Troubleshooting ....................................................................................................... 4
Introduction to RF troubleshooting .............................................................................4
RF Key component placement .....................................................................................5
RF Measurement points ...............................................................................................6
GSM900 & GSM1800 Transmitter................................................................................ 7
General instructions for Tx troubleshooting ............................................................. 7
Transmitter troubleshooting diagram ........................................................................ 9
Pictures of transmitter signals ................................................................................. 12
GSM900, GSM1800 and GSM1900 Receiver............................................................. 14
General instructions for Rx troubleshooting ........................................................... 14
Troubleshooting diagram for GSM900 receiver ..................................................... 18
Troubleshooting diagram for GSM1800 receiver ................................................... 19
Troubleshooting diagram for GSM1900 receiver ................................................... 20
Synthesizer ................................................................................................................... 21
General instructions for synthesizer troubleshooting.............................................. 21
Synthesizer troubleshooting diagram ...................................................................... 22
Pictures of synthesizer signals................................................................................. 23
Baseband troubleshooting ............................................................................................ 25
Main Troubleshooting Diagram ................................................................................25
Phone is dead .............................................................................................................26
Flash Programming Fault ..........................................................................................27
Phone is jammed ........................................................................................................28
SIM card fault (Insert SIM / Card rejected) ...............................................................29
Keypad Fault ..............................................................................................................30
Display Fault ..............................................................................................................32
Illumination fault .......................................................................................................33
Charger Fault .............................................................................................................34
Accessory Fault .........................................................................................................35
Audio Fault ................................................................................................................36
FM Radio troubleshooting ........................................................................................... 37
FM Radio component layout .....................................................................................37
FM Radio troubleshooting diagram ...........................................................................38
Notes to "FM Radio troubleshooting diagram"....................................................... 38
Diagrams of FM radio signals ................................................................................. 40
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Transmitter troubleshooting diagram
TX troubleshooting TX OK
Yes
Check output signal level: Check
+32...+33dBm @897.4 MHz (GSM900) Yes No Tune
all power TX power
+29...+30dBm @1747.8 MHz levels,
(GSM1800 & GSM1900) levels,
OK ? OK ?
OK ?
No Check output signal
TX signal found ? Yes
on 500 MHZ span Synthesizer
Signal found on troubleshooting
incorrect frequency ?
Yes No
Check with RF probe No
signal level on HELGA
PA input >=0dBm (* troubleshooting
OK ?
*(When 1kOhm passive probe is used,
Yes correct the measurement result by +26dB
start TX power level
tuning and check
tuned RAC values: Yes
Highest level~700...900
Lowest level ~190...210 Tune Tx DAC values
Base levle ~160...190
Major differences ?
No
Yes
Check with oscilloscope: Check control loop
PA ctrl voltage Replace HELGA
dead
components
>1.5V peak OK ? OK ?
No
Yes
Yes
PA & ant switch Replace
troubleshooting faulty
component(s)
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HELGA
troubleshooting
Check with oscilloscope:
-TXI/TXQ signals No
-VR1, VR2, VR4, VR5, VR6 = 2.8V Baseband
-VrefRF01 = 1.35 V troubleshooting
-HELGA serial interface
-TXP & TXC signals
OK ?
Check with RF probe:
-4G VCO out signal No Synthesizer
- 3589.6 MHz (GSM900) troubleshooting
-3495.6 MHz (GSM1800)
- 3760 MHz (GSM1900)
Level >-10dBm (*
OK ? *(When 1kOhm passive probe is used,
correct the measurement result by +26dB
Check modulator Yes
output components
Replace HELGA
dead
OK ?
Replace
faulty
component(s)
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PA & ant switch
troubleshooting
*(When 1kOhm passive probe is used,
correct the measurement by +26dB
Yes
Check with RF probe Yes Check with
signal level on oscilloscope: Replace
PA input >=0dBm (* -VANT_1 (GSM900) ant. switch
OK ? -VANT_2 (GSM1800)
-VANT_3 (GSM1900)
Yes OK ?
Check with No
oscilloscope:
-VBATT ~4V
- VTXB = 2.8 V pulsed Check
- VTxLO_GSM = 0V (GSM900) VANT lline components
OK ? OK ?
Yes
No Yes
No
Replace
PA
Replace
faulty
component(s)
Check components
around PA Yes
Replace
OK ? HELGA
No
Replace
faulty
component(s)
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200mV/div 100us/div 200mV/div 100us/div
1
VPCTRL _900 power level high at R703/C703 TX I/Q at R516/517 power level high Random data
VPCTRL_1800/1900 power level high at R704/C704B
1
500mV/div 100us/div
500mV/div 100us/div
VANT_1 / GSM900 TX at C804 VANT_1,VANT_2,VANT_3
VANT_2 / GSM1800 TX at R808
VANT_3 / GSM1900 TX at C805 OV
( no signal/ Flatline on Oscilloscope screen)
500mV/div MTB 100us/div
500mV/div 100us/div
VTXB_900 at C713
7;3 DW -
VTXB_1800_1900 at C714
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