My car stereo turns on but no sound comes out it's a alpine cde 133bt does anyone know how to fix it

SOURCE: Alpine CDE-9843

Page 16 of the manual:
http://vault.alpine-usa.com/products/documents/CDE-9841,%2043,%2045%20OM.PDF

Setting Time
1 In the Clock priority mode, press and hold
TITLE for at least 2 seconds while the time is
displayed.
The time indication will blink.
2 Turn the Rotary encoder (CDE-9845/CDE-9843
only) or press 4 and 3 (CDE-9841 only) to adjust
the hours while the time indication is blinking.
3 When the hour has been adjusted, press the
Rotary encoder (CDE-9845/CDE-9843 only) or
press MODE (CDE-9841 only).
4 Turn the Rotary encoder (CDE-9845/CDE-9843
only) or press 4 and 3 (CDE-9841 only) to adjust
the minutes while the time indication is blinking.
The time is automatically set 5 seconds after the minute
adjustment. The time can also be manually set by
pressing the Rotary encoder (CDE-9845/CDE-9843 only)
or press MODE (CDE-9841 only).
• To synchronize the clock to another clock/watch or radio time
announcement, press and hold the Rotary encoder (CDE-9845/
CDE-9843 only) or press and hold MODE (CDE-9841 only) for at
least 2 seconds after setting the “hour.” Minutes will reset to 00. If
the display shows over “30” minutes when you do this, the time
will advance one hour.

SOURCE: Alpine CDE 7853 removal

remove the face and then the trim ring for face you should see 2 little pins on either side of the radio slide them up and it should slide right out

SOURCE: After installing the alpine cde 9870 car stereo

In this situation 8 times out of 10 the problem is not with the radio, it's that there are factory amplifiers. Many cars have them, and most require a little work, or an adapter to get going. Tell me the year, make, and model of the car, and perhaps I can give you more info.

SOURCE: alpine 9845 cde head unit car stereo

Press the Rotary encoder (CDE-9845/CDE-9843
only) or press MODE (CDE-9841 only) repeatedly
to choose the desired mode.
Each press changes the modes as follows:
BASS → TREBLE → SUBWOOFER* → BALANCE → FADER
→ DEFEAT → VOLUME → BASS
BASS: -7 ~ +10
TREBLE: -7 ~ +7
Subwoofer : 0 ~ +15
Balance : L15 ~ R15
Fader : R15 ~ F15
Defeat : ON/OFF
Volume : 0 ~ 35