Question about LG 37LG30 37 in. LCD HDTV

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No power? Went to turn today my 37" LG tv on and it seem to have no power what so ever? tried it again about an hour later and now i have a standby light coming on, but when i press power on, it seems to flash once like its was just about to come on, then flash 3 more times then go back to being on standby. some times the standby light comes on and when i press power on it just loses all power and i have no standby light at all? can you help me please. thanks.

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  • LG Master
  • 3,187 Answers

Power board failed check the main board the 5 volt side may have a few capacitors blown. check all of them as usually when 1 starts to go rest can follow don't cost much to replace. the ones next to the heat sink are first to start to wear out, use the ratings that are on the old capacitors and replace the same 105c temp rating. and rating to failed capacitors, you will see the faulty capacitors they will have blown bowed tops or a liquid on the bottom of them

Posted on Jun 21, 2017

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6ya6ya
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Posted on Jan 02, 2017

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circuitworld
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SOURCE: hello. I got a Lg

First disconnect all power to the TV for about 30 minutes this gives the filter caps time to discharge as this resets the logic section upon power-up. After 30 min try powering back up if you still have the same problem then there's a problem with the power supply board. You may have some caps with high ESR levels which can cause this kind of fault. But it could other components on the power board causing a similar fault like switching transformers that have shorted, or opened either which can cause EDDY Currents which will cause feedback in opto-couplers and shut the TV down. Let me know what results you get after the 30 minute power-down.

Posted on Oct 18, 2010

budmrtn
  • 11361 Answers

SOURCE: LG 37 lcd. whenever i

First place to check will be the power supply module, need to verify if it is putting out staedy DC first. This can be due to simple thing such as bad caps.
Please read my guide for more details.
Service manual: www.elektrotanya.com

If you are going to DIY and have proper tools, electronics knowledge, and know safety precaution then please read on:

Basic LCD monitor and TV troubleshooting guide:
http://www.fixya.com/support/r5093881-lcd_flat_panel_tv_troubleshooting_guide
http://www.fixya.com/support/r6150077-basic_lcd_monitors_troubleshooting
http://www.fixya.com/support/r7406380-tv_training_manuals
Failed TV and Monitors pictures: http://s807.photobucket.com/albums/yy352/budm
Learn about bad caps: http://en.wikipedia.org/wiki/Capacitor_plague
Parts: www.shopjimmy.com
Parts: http://interliquidparts.com/

Capacitors kit: http://lcdalternatives.auctivacommerce.com/Default.aspx he can make you a set of caps.
Or www.digikey.com, just make sure to use caps with low ESR, 105c, high ripple current and long life rating such as PANASONIC FM or FC series.
Please post back what you find.

Posted on Aug 01, 2011

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