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(1) Checking Crystal Circuit
TXO_HB
CLK_SEL
MICBIAS1
MICBIAS0
LGE Internal Use Only
TP1
W23
TXO_LB
LowBand_Tx
W24
HighBand_Tx
AA16
AC16
XTAL1
AB16
XTAL2
W15
FREF
U23
P23
26 MHz
O.K?
Yes
Crystal is OK.
See next page to check PLL Circuit
Figure 4.2.1
TP1
X101
1
2
EARMIC_BIAS
4
3
TSX-3225 26MHZ_7_4PF
26MHz
C132
1u
No
Replace TP1
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4. TROUBLE SHOOTING
VMIC_BIAS_P
Only for training and service purposes
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