4.2.2 Check VCTCXO Circuit
TEST POINT
Circuit Diagram
Waveform
Checking Flow
Pin 3
19.2MHz OK?
VCTCXO Circuit is OK
See next page to check
SBI control signal
YES
NO
Pin4
2.8V OK?
Replace U407
NO
Check U400
X100
YES
U407 Pin4 (
+2.8V_TCXO)
U407 Pin3
(TCXO)
U407 Pin3 TCXO
U407 Pin4 +2.8V_TCXO
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Summary of Contents for LG-RD2750
Page 33: ...DCN Mode Graph 4 2 1763 04MHz DCN384 Z 3 X B O X C O M ...
Page 37: ...Waveform DP101 Pin 7 Graph 4 3 c DP101 Pin2 Graph 4 4 c Z 3 X B O X C O M ...
Page 48: ...Circuit Diagram Z 3 X B O X C O M ...
Page 49: ...Figure 4 3 1 PMIC PM6610 FUNCTIONAL BLOCK DIAGRAM 4 3 Logic Part Trouble Z 3 X B O X C O M ...
Page 68: ...RD2750 Block Diagram Z 3 X B O X C O M ...
Page 69: ...Z 3 X B O X C O M ...
Page 70: ...Z 3 X B O X C O M ...
Page 71: ...Z 3 X B O X C O M ...
Page 72: ...Z 3 X B O X C O M ...
Page 73: ...Z 3 X B O X C O M ...
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