Question about LG 62SX4D 62" Television

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Will not turn on

2 y/o LG 62SX4D TV will not turn on. When you press the power button the white lights scroll up like normal but it does this for a longer than normal period of time. After about a minute it stops, the top red light comes back on like it does when it's off and the red light right under it flashes like it's a bad bulb. I've confirmed that the bulb never illuminates.

The bulb has been replaced suspecting that the bulb went bad. Still wouldn't work but eventually it did start working and worked for about 2 weeks. Now it's acting like the bulb needs to be replaced again.

When it was working I got into the menu to reset the bulb hour counter and it said there was only 4100 hours on the original bulb. I reset the counter since the bulb was replaced anyway.

It seems like it's unable to get power to the bulb or something is blowing bulbs. I'd like to test if the bulb is getting power but I'm having a hard time bypassing the momentary switch that detects if the bulb replacement panel is installed so I can have a multimeter on the connector for the bulb to check voltage.

I've had no success in finding any technical information so I can troubleshoot. Any advice would be helpful. Thanks.

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  • 4 more comments 
  • lilliz67 Mar 21, 2008

    My husband was wiring up a ceiling fan while watching TV and tripped the breaker at least 2 times. Now you can watch our LG 62SX4D TV for about 20 minutes and it turns itself off. If you try to turn it back on, it scrolls through the white power buttons like it is going to come on, but doesn't. This is maddening! This TV is 2 years old.

  • Anonymous May 10, 2008


  • major12 May 27, 2008

    man, i am having the same problem. when i bought my tv it was working fine, i brought it home, and nothing. the white light scrolls up and down like its gonna come on, but then the red light pops back on and the bulb lights starts flashing as if there is a bulb problem. i believe my bulb is burnt out. is the bulb supposed to show continuity on the contacts? i believe it is. i have ordered a new bulb, because i hope that solves it. it sucks to have such a large TV that wont work. if anyone knows anything, let me know. as soon as i get my bulb i will tell you all what is happening. i also paid 12 bucks to download the service manual. if anyone needs it i would be more than happy to send it to them for free.

  • crewchief11 Jul 29, 2008

    I have the same tv, 2 years old. The sound on HDMI 1 stopped working, still had the picture. So I changed to HDMI 2, that worked for a day and then the sound stopped. Next I changed the input to the component cables (I think, 5 RCA wires). That worked for about a day. Next I changed the sound to my stereo and watched to picture still on HDMI. That worked for about 3 or 4 days, now the white lights cycle and then the top light stays solid and the next red light down blinks and nothing else happens on the tv. I am on the 3rd bulb. Every one I talk to says it sounds like a power supply? Any help possibly a service manual or diagram would help. Thank you


  • Terminator X Aug 01, 2008

    When i turn the tv on , white light scrolls up & down, then turns green, after about 2 mins it switches off, lights red & also flashing red light below it, next to that flashing red light is a pic ture of a bulb...

  • Paul_J1 Sep 26, 2008

    Same here, bought a new bulb and nothing changed. Major12 Could you please send me a copy of the service manual before I torch the thing lol



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  • 22 Answers

Holy Smokes!! I sure hope you did not try to connect your multimeter to bulb connections . That is from 1500 to 2500 volts and will smoke your meter for sure .
It sounds likes you may have a power supply issue , but , I would put it on the bench and check for bad capacitors with an ESR meter first . Second look for bad or burnt connections along the high volt wire(note the special insulation used and the wide spacing at the termination)
Sadly some bulbs will not run long out of the box due to the occasional manufacturing problems(impurities?) most have a 90 day warranty . See if you can get the bulb into another set or a service depot might try to light it up in their sets .
Handle with care as these bulbs don't like rough stuff and
 DEFINITLY NO FINGERPRINTS or SCRATCHES even on the glass window that may be there in front of bulb proper  .
Also a possible problem may be just a fan not turning as they all
have tachometer wires to feedback the unit . Next make sure no filters are plugged as a over temperature condition may be reached , check the thermal protector for continuity(round metal peice exposed to lamp heat with two wires)
Good air flow is a must as these Ultra High Pressure bulbs generate HEAT .

Good luck
Hugh Ireland

Posted on Jan 08, 2008


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