Testing an TDA7375

[llpkn]

Hello,

I'm trying to figure out why an old car radio is completely silent.
Everything seems to work (cd player spin, lcd display change when pressing buttons, ...), but no sound. Speakers circuitry is ok.

After opening the case, I have found 2 TDA7375, used in "Double bridge" mode (datasheet page 4).

I think this is a good start to check if theses amplifiers are still ok.

Is it possible that both 2 TDA7375 failed a the same time ? Or should I look somewhere else ?

Is there any way to check theses components without desoldering ?

Thanks in advance

PS: datasheet is attached

 

[gootee]

First thing to check (after inspecting circuit closely by eye, for burned parts or leaking capacitors or anything else that doesn't look good) is the power supply voltages at the chip's power supply pins.