LG / GOLDSTAR DR-7400
Instrukcja Serwisowa

No 3.3V

No 5.0VA

Is the Vcc(3.3V) supplied to Q162 Emittor?
YES

NO

Check or Replace the D124

Is the Vcc(5.3V) supplied to IC153 Pin1?
YES

NO

Check or Replace the D123

Is the Q162 Base �H�?
YES

NO

Check the PWR CTL �H� signal from µ-com

Check or Replace the IC153

Check or Replace the Q162

No 5.0V

No 5.0VA

Is the Vcc(5.3V) supplied to IC156 Pin1?
YES

NO

Check or Replace the D123

Is the Vcc(5.3V) supplied to IC155 Pin1?
YES

NO

Check or Replace the D123

Is the IC156 Pin4 �H�?
YES

NO

Check the PWR CTL �H� signal from µ-com

Is the IC155 Pin4 �H�?
YES

NO

Check the PWR CTL �H� signal from µ-com

Check or Replace the IC156

Check or Replace the IC155

3-3