[TechAssist] RCA PROJ. Micro or Memory IC???


Fellow Techs, RCA P46731AT, chassis PTK169PGA, I can`t figure which IC 
is giving me this problem, Using
 front control panel, power& vol up/down work, all other buttons don`t 
work, OSD is good, channel up/down
momentarily blanks the set but channel does not change, buttons on 
remote are exactly the same, If I enter the
channel numbers, ie, 08,09, etc on the remote the tv changes channels, 
only goes to 13 then snow so obviously it`s
defaulted to AIR instead of CABLE, but of course I can`t get set-up menu 
to come up. Have 5volts to  u3200 the memory ic and  5v to Vdd of Micro, 
 scoped pin 6 of micro while pushing menu button and signal is there, 
data and
clock are at memory IC, the only voltage I found low/bad was pin 5 on 
u3200 which is data pin, it reads 3.95 volts,
appears it should be a volt higher?? I have the service manual but am 
stumped at the moment, any help would be
greatly appreciated, Larry E.
American TV & Electronics
Sunny FL.

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