Toshiba SD-270EKB2, Руководство по обслуживанию

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1 -6
No display on LED, and buttons do not work
No
No
No
Yes
Yes
No display on LED, and
buttons do not work
Check whether there is
correct contact
between CON3 and
CN5
Correct connection
Fix power supply board top
a power supply for should
electric circuit
Check the U1’s pin 131,132,133
arrive the CN5 connect condition
Correct connection
Replace U1 or LED
Yes
Yes
Yes
No
Check VCC(+5v) voltage
on the power and front
board
Check there are CS,
DATA and CLK signals on
CON3 on the front board.
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.
CN5 (PIN 2 CLK) CN5 (PIN4 DOUT)
Trouble shooting chart