Troubleshooting Guide - Sanyo VPC-HD700 Service Manual

5. TROUBLESHOOTING GUIDE

POWER LOSS INOPERTIVE
PUSH THE POWER
SW FOR A WHILE
IC301-44
YES
(SCAN OUT2)
PULSE INPUT
NO
NO
IC302-7 5.3 V
(BOOST 5.3 V)
YES
LOW
IC301-9, 38, 62
(VDD)
HIGH
LOW
IC301-56
CHECK IC302, RB312
(RESET)
HIGH
LOW
IC301-52
(BAT OFF)
HIGH
NO
IC301-58
OSCILLATION
YES
CHECK IC301
NO PICTURE
NG
X1102 MAIN CLOCK FOR SYSTEM OPERATION
CHECK OSCILLATION NO OPERATION IF ABSENT
OK
INCORRECT HANDSHAKING
NG
IC301-67, 66
BETWEEN 8-BIT CPU AND ASIC
(ASIC_SO, ASIC_SI)
CHECK EACH INTERFACE
OK
CHECK SOLDERING
OF MEMORY
EACH PIN
CHECK S3003
CHECK IC501
CHECK IC302
CHECK RB312
CHECK X3002
TAKING INOPERATIVE
PUSH SHUTTER
BUTTON
IC301-23, 24
(KEY_1st, KEY_2nd)
LEVEL INPUT
IC501-26, 32 (PON)
Q5010-2 (PON2)
IC501-30 (PAON1, 2)
SERIAL
COMMUNICATION
CHECK CP1 DMA
BLOCK
– 23 –
NO
CHECK SW UNIT
YES
LOW
CHECK IC301, IC101,
PWA BLOCK
HIGH
NG
CHECK IC301,
CP1 DMA BLOCK
OK