[TechAssist] RCA140CE (sound)

I ask for help for this TV before and still I'm working on it.
I have noise sound when I have not connector in the input when I connect the 
antenna and go to a working channel the sound go away if I go to a channel 
that is not working I hear the noisy sound. The video is perfect.
I saw tip that say.
Problem: audio missing when the TV was tuned T0  a station. (MY problem)
Fix: CR2502.
Here is my problem I can not find the CR502. I check the main board up and 
down and I can find it. Do someone out there can tell me in what direction 
look to find that part?
Thank you.
                           Jose.
PS. I change IC U2300 Dual IF.
                    L 2306 Sound discriminator.
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