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GD300S
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LG GD300S Service Manual page 86
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4. 故障解决
3.检查 PLL 控制信号
测试点
电路图
VCO_CNTL
VSUP8_LDO2
U203
AD6541
SYN_CP
检查流程
使用示波器
使用频谱分析仪
DBB2RF_SDATA
DBB2RF_SEN
DBB2RF_SCLK
28
30
R207
25
R209
FLK
27
13
确认波形
SEN/SCLK/SDATA
U203.Pin27
信号频率为
2017.4MHz?
是
PLL控制信号工作正常
参见下页检查内容
2
SDATA
3
U203
SEN
4
AD6541
SCLK
5
C227
82p
5.6K
C229
C230
2.7K
C240
220p
0.1u
2200p
否
PLL部分元件异常?
是
更换PLL部分元件
- 86 -
R208
10K
否
更换U203
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