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When the cable company offers you digital cable, you typically need a cable box to unscramble the digital channels. Therefore you need to connect either a coaxial cable from the cable box's RF output, if it has one, or connect 3 RCA cables from the yellow, white and red jacks on the rear panel of the cable box to the TV. Analog channels only (if available) will go straight thru over the coaxial RF hookup. They are not scrambled. Select the proper input source on the TV for the cable box.
Since this is an older first generation (1999) HD TV it may not be compatible with newer HDTV receivers because the standards back then were different - Make sure the HD cable box is plugged into the HD component inputs on the back of the TV (not the DVD inputs) and that the menu setting on the TV is set to DTV (not RGB) video. This TV will only accept 480i and 480p signals on the DVD input. Also the HDTV input will only accept 480i,480p and 1080i (it will not work with a 720p signal,make sure your cable box is not set to that mode)
That is a VZ3 chassis, similar to Mitsubishi models Ts-4545, Ts-5045, Ts-5545, Vs-4543, Vs-4544, Vs-5043, Vs-5044, Vs-5047, Vs-6043, Vs-6047 and has common failures in the vertical circuit, specifically vert Ic401 which is a La7845 which is usually caused by defective C402 100uf 50v and/or open 1.2 ohm 2 watt R510 next to FBT.
If not that check C268 off Q215 on signal board 22mf/50v and Ic200 on signal module Cxa2025s. However the vertical failure is more likely.
I don't think you will need the manual to perform this task. Like I stated the concern is on the signal board. Looking at the TV from the back the signal board will be on your left, the parts of concern will be on right side of "signal" PCB, toward the center of said board. You can see part location numbers easier from the bottom.
I just had this same exact problem. I looked for an answer on here and could not find one. So I took the back off, vacuumed and cleaned everything out with the hose on my house vacuum, cleaned the bulbs and wiggled them around some. Voila !!!! lights on and all is working fine and better then ever. I hope this helps someone fix their problem. Just saved me tons of money and a morning of hassle.