Toshiba SD-170EKB2 Service Manual - Page 9
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No display on LED, and buttons do not work
Check
correct contact between CN3
and CN5
1.Check whether bad solder exists
On U1 and pins of LED,
2.Check whether the circuit connected
to S1, S2,S3 and S4 is broken,
3.Check whether R6, R7 and R8
are open-circuit.
No display on LED, and
buttons do not work
Yes
whether
there
Yes
Check VCC(+5v) voltage on
the power and front board
Yes
Check
there
are
CS,
DATA and CLK signals on
CN3 on the front board.
Yes
Yes
Replace U1 or LED
1-6
is
No
No
Fix power supply board top
a power supply for should
No
CN5 (PIN 2 CLK)
Trouble shooting chart
Correct connection
Check the U1's pin 131,132,133
arrive the CN5 connect condition
CN5 (PIN4 DOUT)
No
Correct connection