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Flow Chart of Troubleshooting
7-
12
7-6. Speaker Part(MP3/Spk)
I2S clocks at 11, 13, 14,
17 pins of U801 are OK?
Stereo Speaker does not work
Check the signal at 25,
26 pins of U801
Check the supply voltage of
U301,U801(3.3V)
Check 27MHz clock of OSC300
END
No
Yes
No
Check the signal at 4,
16 pins of U803
Check 10 pin of U803 is 1.8V
Yes
No
Check the PWM signal at
4,6,16,18 of U804
Change U804 (D class Audio AMP)
Yes
No
Check the Speaker
contact pins
No
Yes
Peplace Speaker inside Intena
Yes
Yes