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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Re: Will not turn on

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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