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LG TV Model RT-21FB70V When switched on, the light does not come on the front, the picture does not come on, a clicking starts internally, then a high pitched chirping. The fuse is good. There is no obvious burnt components on the cct board. Does any one know what it might be?

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5 Suggested Answers

  • 375 Answers

SOURCE: Samsung PCL5415RC Chirping noise

power supply discharging.even after the set is unpluged.

Posted on Sep 13, 2007

  • 1694 Answers

SOURCE: Flashin power light - wont come on

The "green light flashing to the chirping" circuit may be defective.

Not a basic diagnosis--service literature and/or knowledge of each green light circuit will be needed.Possible shop repair.

Posted on Oct 18, 2007

  • 395 Answers

SOURCE: Samsung PCL542R Chirping noise

the high pitch chirping noise is coming from the power supply. there is a short circuit with the switch mode power supply. check the HOT(horizontal output transistor) first then the power supply for shorts. on the HOT check for short between base to collector, and emitter to collector. base to emitter will show short because it in line with the primary coil of the fly-back transformer.
if you are unfamiliar TV repair have a tech repair this for you.

Posted on Feb 17, 2008

SOURCE: LG Rear Projection Television Model RT-56NZ23RB - Fault

For my LG TV - LG RT-56NZ23RB, I replaced two STK 392-120 chips and it has fixed convergence problem now.

Posted on Jun 09, 2008

  • 1 Answer

SOURCE: Lg RU-52sz30 rear projection tv does not go on

I have an lg dlp projection tv Model # 52sx4d-ub.I replaced the bulb,everything correctly,but no picture. LG says I have to have a tech come out to reset? Can you help.

Posted on Jan 24, 2009

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Lg rt 56nz23rbLG Rear Projection Television Model RT-56NZ23RB -switches on for 10 seconds with sound but no picture and than switches off by going into stand by position.The horizontal and vertical outputs...


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I own a LG rear projection tv model number RT - 44NZ31RB and for some reason refuses to turn on. Worked fine and then all of a sudden stopped. Standby light comes on and then a small noise can be heard...


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3 Answers

LG Rear Projection Television Model RT-56NZ23RB - Fault


Check your horizontal output and regulators also vertcal output.You have a deflection problem either Horizontal or vertical outputs or one of the regulators are faulty. Let me know if you require more assistance.

Feb 02, 2008 | Televison & Video

2 Answers

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