Samsung SPH-A900 - Page 35

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Flow Chart of Troubleshooting
7-7
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7-1-3 Speaker, Receiver and Mic Checking
Check HDC500
and Receiver
Check mic path from
HDC502 to UCP102
and it's neighboring
circuits.
Check
TP25,26,30 and 39(SPK_R,
SPK_L)
on LCD signal OK?
R
eplace receiver
Check KEY FPCB
Insert Power
Receiver is
OK?
MIC is OK?
Check
HDC502 pin8
signal on?
Check HDC500
pin 5, 6
signal OK?
Check HDC500
pin3(HPH_L),
pin4(HPH_R)
signal OK?
NO
NO
END
YES
YES
YES
YES
YES
YES
Speaker is
OK?
YES
NO
NO
NO
R
eplace Speaker
YES
Check LCD
FPCB
NO
Check HDC500
pin3(HPH_L),
pin4(HPH_R)
signal OK?
NO
Check
U4 on
LCD
and
Speaker