Probably corrupted eeprom data. Has the tuner ground been performed
properly to service bulletin specification, then check the eeprom data, if
corrupted replace and perform a full eeprom chassis alignment, including the
geometry, gray scale, stereo audio process, agc, tuner alignment, etc.

David

Gary wrote in message
...
I've had a tv dropped off in the shop with a problem I've not seen before.
The on screen menu and channel indicators quit working and there's good
audio and picture but no color.

RCA CTC187CJ Chassis
F31672ET Model

Awaiting schematics. Any help appreciated.