|The manual download I found is 15903560Rev1.pdf|
Your TV may be newer Revision of the same model,
OR, they had the WRONG User's Guide download.
There is no ethernet jack (wired network port) on the TV in the manual I found.
If your model has the ethernet jack, then I didn't find the correct manual.
In the manual you found...
Page 24 of pdf, 22 of manual - ethernet jack
If your TV has ALL of the connectors shown in the manual you found, then you have probably found the correct manual, and I didn't, initially.
Support for RCA TV models sold in the US
(If you bought it in Canada, the support info may be different.)
"I purchased my RCA TV between 2004 and April 2010"
Downloads - 50 inch - HDLP50W151
(NOTE that I know from previous experience that RCA doesn't always list support for earlier revisions or versions of the same model. )
User's Guide - 96 pages - appears to be the SAME as the one you found
Update - I downloaded the manual you found by clicking on the floppy disk icon in the top bar of Adobe Acrobat Reader - it is NOT the same size as the second one I found - it's smaller.
The one I downloaded is
Maybe e-04 indicates it's for the 4th revision of the model ?
Is there a Revision number on your label ?
Your / that manual DOES NOT show connecting the video port of a computer to the DVI-D port.
(Update - the quoted page numbers are the ones in the manual YOU found.)
Page 17 of pdf - 15 of manual
"A computer is only needed if you want to view photos or graphics on the TV that are stored on the computer"
Page 24 of pdf, 22 of manual - ethernet jack
You can connect an ethernet cable to a (standalone) router (or to a combo router / high speed modem) that is connected to a computer.
You would need a computer monitor connected to the computer too.
You could try doing that if you have a router.
"You are thinking that I should not try to use the Input 5 DVI-D connection and use Input 3/4 instead with the cable you suggested which converts DVI-I to three audio/video plugs?"
You could do that, but as I said above, connecting to a single legacy composite video RCA port, or to a legacy S-Video port "results in a relatively crappy looking display" on the TV.
You would need to connect to a "TV Out" single RCA jack on the computer, or to a "S-Video" port on the computer, via either a S-Video to RCA jack gender adapter and a single RCA cable with (male) RCA plugs on both ends, or a legacy S-Video cable (4 pins on both ends.)
The "TV Out" video output is processed through a chip on the computers video adapter such that it's output conforms to legacy TV standards that are much older than computer monitor standards.
Playing a video looks acceptable but it's not HD video, and the text on the desktop screen looks crappy on the TV.
Does your computer have a "S-Video" port ? A single RCA jack for TV Out ?
Update - I looked at the User manual for your model - NO, it has neither.
("S-Video" port = a legacy S-Video port has only 4 pin holes, the legacy S-Video cable has only 4 pins on both ends. The "S-Video" port on computer graphics adapters has more pin holes, so it isn't a true S-Video port, but a legacy S-video cable, or a standard legacy S-Video (4 pins) to (single female) RCA jack gender adapter, plugs into and works with the graphics adapter's "S-Video" port fine. )
What I was suggesting should work fine is a HD component video connection for the video - three RCA connections for the video.
Page 10 of pdf - 8 of manual
Component Video Y + PB + Pr cable
That has 3 RCA jacks on both ends - some things such as DVD players have the three RCA jacks for HD video.
What I'm suggesting is a custom cable not shown - a DVI-I connector to three RCA jacks
Something like this:
DVI-I to 3 RCA Component Cable - 6ft
page 21 of pdf - 19 of manual
Component video (Y + Pb + Pr)
Page 23 of pdf - 21 of manual
Video input 3 - all 3 jacks - HD video
Audio input 3 - audio for the HD video
Video input 4/Audio input 4 - same thing
HDCP is NOT mentioned in the manual you found / the second manual I found.
If the DVI port is actually a DVI-HDCP port that's certainly not stated in the manual.
In theory, the DVD-D cable should work to get a display on the TV if it's truly dual link - it's possible it's end connectors have all the pins for dual link but only the pins for single link are wired up.
Did / does it say dual link on it's packaging ?
Or - do you have, or can you borrow, an ohm (resistance) meter, or a multi-meter, that you can use to check whether all pins are connected to each other via wires in the cable on both ends ? (~ 0 ohms between pins in the same position on both ends - they're connected.)
By the way, how long is the DVI-D cable ?
You're likely to have problems connecting to at least some displays if it's longer than the max spec ~ 15 feet.