Here is the response from LG/Zenith customer support:
Unfortunately, this remote has very limited programmability. The manual is correct.
: Controlling other TVs with the remote You can control the sound level, input source, and power switch of non-LG TVs as well. If your TV is listed in the table below, set the appropriate manufacturer code.
Code numbers of controllable TVs
- While holding down TV POWER button, press the number buttons to select the manufacturer code for your TV (see the table).
- Release TV POWER button. Code numbers of controllable TVs If more than one code number is listed, try entering them one at a time until you find the one that works with your TV.
If more than one code number is listed, try entering them one at a time until you find the one that works with your TV.
Manufacturer Code Number
LG/GoldStar 1 (Default), 2
Zenith 1, 3, 4
Samsung 6, 7
Sony 8, 9
For further information or troubleshooting, you may contact us at 800-243-0000 for LG Customer Service assistance. An agent will be glad to assist you. Please feel free to contact us with any additional questions or concerns. Thank you again for contacting LG Electronics.