Is It Present; (Flash Rom) Pin; Yes; Check The Circuit Around Lcd - Samsung SGH-600 Service Manual

ALERT TONE
Abnormal Alert tone
Check the connection
from Buzzer to U308?
U307 pin 5 (AVCC) = 3.0V?
the 13 MHz clock signal
Come out from the U405
pin 64?
Is there alert wave
form on the U405 pin 36 during
alert tone test?

Is it present

the alert wave form on the
U308 pin 5?
Check the circuit around
U452 (E
Samsung Electronics
No

Yes

No
Yes
Does
No
Yes
No
Yes
No
Yes
2 PROM)

END

Resolder the connection from
Buzzer to U308
Check the circuit related to U307
Check the connection from
U408 pin 85 to U405 pin 64
Resolder U405 pin 36
Check the circuit around U308
Troubleshooting
5-9