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Overheated AM3517 output noise to audio codec

Other Parts Discussed in Thread: AM3517

We have port android 2.2 to am3517 platform, AM3517 may overheat when it loads complicated homepage especially with many flash, or play 3D game, everything still runs okay, except the audio.

Am3517 will product noise from the speaker. We use Am3517 ZOOM EVM with an TLV320AIC23 audio codec. Android uses alsa driver.

There is no noise when it play music, even AM3517 is overheat.

When there is noise, if I put my finger on the chip to cool off it, the noise will disappeared.

 

Anybody encounter this circumstance?