Fm Module Circuit - Huawei G700-U10 Maintenance Manual

G700-U10 Smartphone
Maintenance Manual
Circuit Analysis
The GPS function is provided by the MT6628Q, too. The GPS module uses the UART
interface for signal transmission. The GPS antenna connects to the antenna on the phone
housing through the spring J2304. The GPS module does not share its antenna with any other
module.
Troubleshooting Process
Figure 10-62 Troubleshooting GPS failures
Circuit Signals
Table 10-22 Circuit signals of this section
Signal
UTXD3
URXD3

10.4.19 FM Module Circuit

Circuit Diagram
See section 10.4.16 "Wi-Fi Module Circuit" for the module's circuit diagram. Figure 10-63
shows the FM antenna circuit.
Issue 1.0 (2013-07-22)
GPS failure
Is the 4-in-1 chip
U2200 properly
soldered?
Y
Is the GPS antenna
circuit normal?
Y
Resolder or
replace U401
Description
UART interface used for BT&GPS&FM control signal
UART interface used for BT&GPS&FM control signal
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N
Resolder U2200
Re-install the antenna, or
N
resolder or replace the
surrounding components,
and check that Z2302 and
U2302 are properly soldered
10 Circuit and Failure Analysis
Reference
Value or
Waveform
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88