Help car stereo deck no sound?

[Dang]

I have a JVC KD-LH910 deck all a sudden theres no sound coming out from the speaker but everything else seem to work. I test the speakers out and it seem to be working fine but when i hook it to the deck no sound. When i turn the deck off and back on again i can hear sound coming out for the speaker for about 3 second and then no sound at all. I check the fuse on the back of the deck it not blown so i dont know exactly whats the problem. Anyone know what seem to be the problem and how to fix it?

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[chriswho 10+ year member]

same thing happen to my alpine and i never found out what it was