Toshiba SD-V594SC Service Manual page 97

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Is there voltage at pins 161,
178 of IC4001 about 1.8V
and at pins 166 and 172
about 3.3V ?
Yes
Is there voltage at pins
18 and 19 of CP5901?
(Connects with monitor)
Yes
Is there waveform
Q5904 (SCL) and
Q5905 (SDA) ?
Yes
Change IC4001.
TROUBLESHOOTING GUIDE
No
No
No
E-33
Check 1.8V and 3.3V line of
IC4001 and peripheral circuit.
Check P.CON 5V line and
peripheral circuit.
Check IC4001 and peripheral
circuit.