Panasonic PT-VZ570 Service Manual page 36

SECTION 1 SERVICE INFORMATION
■ [A] P.C.Board operation check
Check the clock waveform around IC301
A
X301 : 24MHz
When no input,check the waveform around IC301:
A
A13, D12, E12, C1, E4, G2, H2
Check the clock waveform around IC401
A
X402 : 24MHz
■ Main microprocessor check
Check the voltage (DC 6.0V) at pins 6, 7 of connector [K8R]
A
A Check the clock signal (24MHz} at X301
A Check the voltage (DC 1V) at L5861
A Check the voltage (DC 1.8V) at L5856
A Check the voltage (DC 3.3V) at L5838
Check the voltage (DC 3.3V) at pin 2 of IC304 (RESET)
A
A Check the voltages (DC 3.3V) at pins 6 of IC9885(SUB CPU)
Check IC1301 (FLASH ROM) and peripheral circuit.
A
OK
OK
OK
OK
OK
OK
OK
OK
OK
NG
A Check IC301, X301 and peripheral circuits
NG
A Check IC301 and peripheral circuits
NG
A Check IC404, X402 and peripheral circuits
NG
Replace the cable between [P03] - [K8R]
A
Replace [P] P.C.Board
NG
A Check X301 and peripheral circuits
NG
A Check IC5861 and peripheral circuits
NG
A Check IC5851 and peripheral circuits
NG
A Check IC5831 and peripheral circuits
NG
A Check IC304 and peripheral circuits
NG
Check IC9885, IC3802, IC3803, IC3804 and peripheral
A
circuits
NG
A Check IC1301 and peripheral circuits
INF-30