LG -600 Series Repair Manual page 62

Appendix.
Rx Flow Chart & Solution
4-A) Check Placement of U203
4-B) Check U204 Pin 4, 6, Using Spectrum Analyzer
Yes
4-C) Check U201 Pin 5, Using Spectrum Analyzer
Yes
4-D) Check Pin 38, 39, Using Spectrum Analyzer
Yes
4-E) Check Pin 44, 43, Using Spectrum Analyzer
Yes
U203 Working
(RF RX path OK.)
GSM Handsets Lab.
GSM SAW Filter
Output ~ -59dbm ?
DCS SAW Filter
Output ~ -60dbm ?
RF Mixer
Output ~ -60dbm ?
IF SAW Filter
Output ~ -65dbm ?
No
No
No
No
62
5-A Test!!
5-A Test!!
Replace U203
4-C) Test
Replace U200
4-D) Test