LG -A290 Service Manual page 66

(1) Checking Crystal Circuit
TP1(X100)
X100
1 pin : 26MHz
Figure 4.2.1
BT_CLK_26M
LGE Internal Use Only
See next page to check PLL Circuit
C109
TSX-3225 26MHZ_7_4PF
26MHz
2 1
3 4
X100
26 MHz
O.K?
Yes
Crystal is OK.
J31
RFVCO_MT
M32
FREF
H6
4.7u
AU_VCM
Y6
PWM
K34
XTAL1
L33
XTAL2_GND
V4
AVDD_RTC
T4
TP1
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4. TROUBLE SHOOTING
No
Replace TP1
Only for training and service purposes