20 Most Recent LG DU-42LZ30 42 in. LCD HDTV Questions & Answers

Have you looked at your tv for HDMI inputs? What do you want to connect to it? There are two kinds of Hi def cables, one has five rca cables ...3 for video and 2 for audio. The other is for a standard HDMI cable. Your tv should have one or both types of inputs. Converting to HDMI cables will not solve anything, because even some HDMI sources do not embed audio on the cable. Converters that do embed cost several hundreds of dollars, but you must have compliant TV's and devices you wish to connect to be sure they will work..

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The symptom you describe points to a failed main power supply, unfortunately pretty common. There may be an internal fuse you can replace but I wouldn't bother doing that more than once.
The clicking you hear is a relay that repeatedly connects, then disconnects the AC to prevent fire or further damage. 
 
If it just fails to turn on, the main power supply is probably at fault and without some technical background and a couple of test instruments, you will not be able to do the repair yourself. 
What you can do though is; unplug the set, let it stand overnight or at least several hours, remove the back panel and look for a separate board with mostly larger components on it; it will have a ferrite core transformer on it and several larger capacitors which are cylindrical and mounted vertically to the board.
 
Before touching anything inside, especially on that board, allow several hours to be safe since the larger capacitors can hold a painful voltage charge for some hours.  
 
If you see signs of overheating such as discoloration of the board material, it may not be repairable but if you can find a part number on the board, you might be able to buy the power supply and install it yourself.
If there are no signs of heat damage to the board, there may be companies offering to repair it as a subassembly instead of repairing the whole set which could be much more expensive.
If you choose to replace or have it done, the power supply still may not be at fault since most are capable of switching on and off if a downstream problem is causing an overload. 

Remotes.com may have an original remote or an acceptable substitute but using the model number you gave in the subject line, dec pf2999st, is somehow defective as it did not bring up any replacements.
Remotes 

You shouldn't need anything plugged into the accessory jacks to get local sound from your set. Go through the main setup menu and check audio settings; they may be set to turn off the internal speakers to send the sound to a home theatre that you apparently don't have. Most sets have that as a selection and supply L-R audio for an external system and mute the internal speakers.
FYI: The three connectors you mention are coded as follows:
Red - right channel audio White - left channel audio Yellow - composite video (contains synchronization signals and video)
These may be input connectors (for external VCR/DVD decks) so check your owner's guide to verify. 

look for some loss connection/ cold solder in the circuit board...

probably the internal amplifier for the audio output, get ureself an amp with some speakers and forget about the problem

Clean the Lens: Use a DVD cleaning disc to clean the lens. If the problem persists, consider professional cleaning. Test Other Discs: Try playing different DVDs to see if the issue occurs consistently. If it's specific to one disc, that disc might be the problem. Check for Updates: Make sure your DVD player's firmware is updated. Refer to the manufacturer's instructions for firmware updates. Try a Different TV: Connect your DVD player to a different TV to see if the noise disappears. If it does, the issue might be with your TV. The hum is simply the player trying to read the disc. It can't so, it spits it out. Remember that prolonged use of a malfunctioning DVD player could potentially cause damage. If the problem persists, consider seeking professional repair or replacement

Question edited for clarity. It appears to be an LG rather an an IG. https://www.avforums.com/threads/lg-42lb1db-how-cani-remove-the-swivel-base.519459/ Further Help and videos https://www.google.com/search?q=lg+42lb5df+remove+base+stand ..

The screen blank out

Likely a dry connection where the HDMI socket it soldered to the board. https://www.google.com/search?q=LG+PLASMA+TV+MODEL+NO.60PS60-UA+that+is+not+picking+up+the+HDMI Old plasma technology though, time for a new one, as quality has moved on. https://reviewed.usatoday.com/televisions/content/lg-60ps60-plasma-hdtv-first-impressions-review-830 ..

This is the Power Board for it. check those 6 electrolytic Capacitors on the right for bulging or splitting. Don't buy it blindly, it's a guess. The output voltages with a digital multimeter. https://applianceparts.com/item/10217204/LG/EAY62812602/ Many parts are obsolete. eBay has used boards, but they are risky because they are out of scrapped sets. https://www.google.com/search?q=50PN5300-UF+power+board We have a television expert named Larry, but I haven't seen him for a while. This used to be my advice https://www.fixya.com/support/r29790007-repairing_own_television ..

Maybe the disk is not compatible with the DVD player version

It can't be done. The DVD remote will be single frequency for that device only and the LG remote for that LG Blu Ray (or series) only. Companies don't make cross-control between makers easy. The only exception is cable and satellite boxes to allow their remote to also control the television. If you have lost a remote or it doesn't work, this is the answer https://www.fixya.com/support/r29872378-universal_remotes_no_facsimile_remote ..

Question edited for a lot more clarity. All in the link https://www.google.com/search?q=LG+BD590+make+region+free ..

You can't, the LG DVD Remote is single frequency. If you are lucky, the LG Television Remote, might control an LG DVD. If you have lost a remote, have a read of this https://www.fixya.com/support/r29872378-universal_remotes_no_facsimile_remote ..

If you would like to share any clues, yes. Checked power going in, I presume. Any indicator lights? If yes, how many times does it flash?

faulty dvd reading lens,should be change by expert professional