Alpine CDE-143BT

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Hello friends, I have an alpine car stereo that does not want to turn on, checking power is fine, this component that seems to be a diode (but I doubt it is a diode) marks me 7.6 ohms both ways to see me is short and replace but still do not start where you should start looking? I tried to get the datasheets of the pb2986hq and pb2920hq ic but I can't find them to try to see the pinout and see if they are being fed by the other ics in advance thank you all very much.
 

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