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Flow Chart of Troubleshooting
10-4
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10-1-2. Audio part
Receiver sound is not heard
NO
Yes
Check the speaker soldering part
Resoldering
Check the SPK Amp
input/output signal
R516,R527/L503,L502
Check U502(VBAT_AUDIO,
AUDIO_SEL, SPK_AMP_EN)
Change the amp
Check U302
(VAUDIOA_2.5, VAUDIO_2.5)
Change U302 and Re-download
OK
Change the board
Receiver sound from headset
NO
Yes
Check the IF con soldered
condition
Resoldering
Check the jack in (R606)
Hi < - > Low
R516,R527/L503,L502
Check the headset GND
Check the E/P amp input / output
C552, C553 / R641, R642
Check U504 (EARAMP2.5V, EARAMP_
EN)
Check U302
(VAUDIOA_2.5, VAUDIOB_2.5)
Change U302
OK
Change the board
Summary of Contents for SGH-L770
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