RCA 19GT240, CTC185A7 No Sound

[Frank]

Hi Guys, I Have here a RCA CTC 185A7,19GT240, and everything is good exept no sound at all not even a hum nothing,i tested all voltages at U902, all voltages and components seem to be right also Pin 6 of U001= 3.7v, the speaker is good because i use same chassis exept it's a TOB tuner, the one with no sound is a stand up Tuner,any ideas?Thanks in advance.