Panasonic PT-EZ770Z Service Manual page 46

SECTION 1 SERVICE INFORMATION
■ [A] P.C.Board operation check
Check the clock waveform around IC1102
X1008 : 35.455MHz
A
R1709: 24.576MHz
R1713 : 40.3MHZ
Check the clock waveform at the point below;
<EZ770>
A R1803 (LVDS_CK) 76.819MHz
<EW730/EX800>
R1803 (LVDS?CK) 53.183MHZ
A Check the waveform (LVDS output) at R2502, R2508
Check the clock waveform around IC1104
R2224 : 33.3MHz
A
R2225: 25MHz
IC1104-D28 : 60HZ
■ Main microprocessor check
A Check the voltage (DC 6.0V) at pins 4, 5, 6 of connector [A15]
A Check the clock signal (35.455MHz} at R1712
A Check the voltage (DC 1.2V) at L1079
A Check the voltage (DC 1.8V) at L1082
A Check the voltage (DC 3.3V) at L1076
A Check the voltage (DC 3.3V) at pin 1 of IC1031 (RESET)
Check the voltages (DC 3.3V) at pins 11, 18, 29 and 55 of
A
IC1030(SUB CPU)
A Check IC1043 (FLASH ROM) and peripheral circuit.
OK
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
A Check IC1102, X1008 and peripheral circuits
NG
A Check IC1400 and peripheral circuits
NG
A Check IC1103 (FPGA) and peripheral circuits
NG
A Check IC1104, X1009, X1010 and peripheral circuits
NG
Replace the cable between [K9301] - [A15]
A
Replace [P] P.C.Board
NG
A Check X1008 and peripheral circuits
NG
A Check IC1045 and peripheral circuits
NG
A Check IC1046 and peripheral circuits
NG
A Check Q1047, Q1048, IC1052 and peripheral circuits
NG
A Check IC1031 and peripheral circuits
NG
A Check IC1030 and peripheral circuits
NG
A Check IC1102 (CPU & RESIZE) and peripheral circuits
INF-38