Toshiba HD-XA1KN Service Manual page 9

3-3. CPU FAN does not work.
START (3)
Pin 1 of PJ8770
develope 5V±5%?
Power circuit
troubleshooting
3-4. Indicator does not light. ("WELCOME" does not light at startup.)
START (4)
Pin 4 of PJ7 reset and
VFD driver IF bus
working at startup?
1: CS#
2: CLK
3: RESET#
4: DOUT
Failure of digital unit
Yes
No
Yes
No
Replace CPU FAN unit.
PJ7 FFC cable inserted
correctly?
No
Replace FFC cable.
Yes
Replace front unit or
power unit.