Why didn't you use the cables that came with the new remotes? Use electrical tape, and tape the new one, to the end of the old one. As you pull the old one out, it will thread the new one in. Then connect the ends to the HU, and remote. If the remote is working, except for the LCD, I'm going to guess the the old cable doesn't have the correct power. The old remote didn't need much power, to turn on the light (when you turn on the running lights), now you are going to have to power the LCD as well. You can check this, by going to a local stereo shop, and asking them to plug your remote into their unit, with the correct wire. If it works, then you have your answer.
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