Samsung SPH-A900 Service Manual page 35

7-1-3 Speaker, Receiver and Mic Checking
Insert Power
YES
Speaker is
OK?
YES
Receiver is
OK?
YES
MIC is OK?
YES
END
Check
Check HDC500
pin3(HPH_L), pin3(HPH_L),
pin4(HPH_R) pin4(HPH_R)
NO
signal OK?
signal OK?
YES
Check TP25,26,30 and 39(SPK_R,
SPK_L) on LCD signal OK?
YES
R eplace Speaker
Check HDC500
pin 5, 6
NO
signal OK?
YES
R eplace receiver
Check
HDC502 pin8
signal on?
NO
YES
Check KEY FPCB
SAMSUNG Proprietary-Contents may change without notice
This Document can not be used without Samsung's authorization
HDC500
NO
NO
Check mic path from
HDC502 to UCP102
and it's neighboring
NO
7-7
Flow Chart of Troubleshooting
Check U4 on
LCD and
NO
Speaker
Check LCD
FPCB
Check HDC500
and Receiver
circuits.