Question about LG LHY-518 System

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LG LHY-518 my dvd play always say disc unknown every time i try to play a real dvd what can i do some 1 plz help i just bought a dvd i almost took it back until something told me to try 1 of my dvds to see if it work and it did the same thang as my new dvd did

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Re: LG LHY-518

I had the same problem. Also, the disc tray had issues opening if there was no disc in there. The problem was two fold... I think.

1) It was kinda dusty inside the machine and needed a good air can dusting. Get around the tray but be careful not to turn the can upside down and freeze components. I also ran a lens cleaner disc several times.

2) The tray top (only visible with the system open) was starting to warp... likely because the build up of dust was creating too much heat, also causes issues in reading discs... I created a make shift cushion that I taped to the top of the plastic tray that was depressed when the top of the machine was placed back on. This required several tests as if too much pressure was applied, the tray wouldn't open at all and I got read issues in the middle of playing a disc (possibly an alignment issue of the lens caused from the pressure). I finally got a good system where I occasionally have push the top with my finger to open the tray only if it was empty so my padding (made from gauze and gauze tape) was barely getting pressure. Again, this took about 30 minutes of trial and error to get it right. The heat and the displacement due to the warped cover could have caused read issues.

I don't know if either or both of these were the cause of the problem but I can safely say that I have no issues now and yes, prior to this, I slowly went from 100% reading discs to almost 0%.

Sorry for the winded response but this saved me from buying a new system and may save you. Good Luck!

Posted on Feb 04, 2009

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I have an LHY-518 that will not read any discs. Always displays the error message "unknown disc, please, check disc again", then ejects the disc.


Your no disc error can be a DIY like the following steps.
Assuming that the disc is good.
1.Clean the lens. - Sometimes because of dust the lens can't read any disc. Try clean the lens by soft cotton buds. Be careful while doing this.
2.Replace the ribbon - Check the ribbon connected to the lens from the main board for scratch, damage. Once it has an open line then of course the lens can't read the disc. Also try to erase the contact by pencil eraser. If you've done the steps above and the symptoms still there then the next step requires you a little knowledge in soldering technique and reading the ohmmeter.
3.Check the motor - Check the motor that spin the disc with an ohmmeter. You can test it using the ohmmeter (x1) even it is connected on the lens assembly. Good motor - reading should be fairly high and it will spin. Bad motor- reading will drop to low resistance and will not spin.
Hint : 50% of my repaired unit the above parts are commonly caused of the problem.
If you confirmed that you have a defective motor then replace it with a new one. Before replacing the new motor you have to check the clearance of the disc holder with the old one. The clearance should be the same as the old because if not the lens will not read the disc if it is too far or too close.
Ifyou already cleaned the lens, and confirmed that the ribbon is good as well as the motor then I've advice you to send it to repair shop because the next step should be done with an expert because it is quite technical diagnosing the fault between the pick-up lens and the main board.

Hope it may help you.
Have a nice day!


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