2
0
2.Trouble of 3-no’s (no raster, no picture and no sound)
If power indication lamp is lit
yes
no
no
yes
normal
abnormal
abnormal
normal
yes
no
no
yes
Yes
no
Note:When the electric level of the 50
th
pin of
N501is measured low, take R554 out.
Then check if the relevant pins of N501 and N552 are of high electric level. Low electric
level shows that the chip is in trouble. During the check of the peripherals of N501,N502
and N503,oscilloscope can be used to detect the pins of the resistor array connected
3-no’s
Check Standby5V
Is indicator
yellow?
Disconnect power supply
board with data processor
and measure Standby5V
Disconnect data processing
board with infrared board
X793,and then see which
board is out of order.
Powers supply
board in trouble
heck if I2C bus
line of the system
is short circuited
Check
CPU(N501),FLASH(
N502),GAL(N553),re
set the power supply
of IC(N552)
Check the pin
voltage of
N902,D903
Check if the 50
th
pin
of CPU is of high
level.
Check N552 and
N501
Check if 88
th
pin of N501 is
square wave.
Check crystal oscillation of
N501 and N501
Check if 8
th
pin of N553 is
of high electric level
Take out R509,check the relevant
pins of N501and N553. Low electric
level shows the chip is in trouble
Check peripherals of
N501
,
N502 and N503
Summary of Contents for BSV-2751
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