Audiovox CX15 Service Manual download pdf (Page 48)

PT3-H AVC3-U

Trouble of Main Switching-regulator

Is I901 in

intermittent oscillation?

Is I901(4)pin voltage

at the moment of power-ON

below 16V?

Check Q930, Q931, etc.

Yes

Check Q934, D936, D938,

I902, D909, etc.

No

A.

Is Q930(C) voltage

over 3.5V?

Check C910, D938,

T901, I901, I902, etc.

Yes

No

Check D903, D906, etc.

Yes

No

Check D905, C912, etc.

Yes

No

Is I901(4) regular voltage

below 10V?

TROUBLESHOOTING FLOWCHARTS

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