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KT878
Service manual
Rcv 故障 - LG KT878 Service Manual
Microsoft windows mobile 6.1 professional
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Contents
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MODEM侧音频输
出故障
CODEC故障
9 RCV 故障
测试点
电路图
RCV_N
RCV_P
重新下载软件?
(排查软件以及
MODEM部分电
路)
测量C809、C805、
R806、FB806、
是
FB808、FB809是
否供电正常?
(CODEC供电)
否
排查电源电路
CN1501
NA
C1502
33p
- 114 -
否
更换U301
查看U802的各
是
个管脚是否短
路、虚焊?
否
更换U802
C1503
33p
4.故障解决
重新焊接U802
REV_PAD_N
REC_PAD_P
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Service Manual Kt878
2
检查流程
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