Question about LG 37LG30 37 in. LCD HDTV

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I have a problem with my 37LG30; when I first turn the TV on, I get sound but no picture. The picture then flickers on & off, with horizontal lines appearing. This has been a problem since new but is getting progressively worse, now taking 20 minutes or so for the picture to come on fully. I did initially think this was a problem with either the AV sockets or the SCART lead however I don't think that this is the case as it has now started to happen through the HDMI socket (although the problem isn't as bad). Any ideas on what is causng this and how it can be fixed?

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The problem is bad electrolytic capacitors on the back lights power invert board, you need to open the back cove up to change the capacitors.

Posted on Apr 26, 2017

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6ya6ya
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Posted on Jan 02, 2017

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SOURCE: no sound through ps3 hdmi

hi i had a problem, but had no pic, but did have sound, rang sony, and they said buy a new hd cable, went out and bought one, and it worked fine!!!

Posted on Jul 04, 2008

SOURCE: no sound through ps3 hdmi

on ps3 go to settings sound and change sound out put to hdmi you will see 3 different options

Posted on Nov 07, 2008

  • 88 Answers

SOURCE: LG32LC2D - Sound slow to start

This is indicative of a bad main board that will need replaced. For this model make sure the repair person has the full product code (from the back of the unit) so that they can get the correct main board ordered (there are multiple versions depending on the product code). Hope this helps.

Posted on Jan 08, 2009

  • 458 Answers

SOURCE: cant get 42''lcd telly to let me play ps3 threw hdmi cable

You will most likely have to contact your LG dealer to fix this. The problem is due to the HDMI input not recognising the playstation, the cure for this is a software upgrade for External Device IDentification (EDID), which can only be done by a service centre.

Posted on Mar 29, 2009

  • 245 Answers

SOURCE: 32LG3000 No sound,no DTV

check ur sound volume also if sound is muted this all can be done by ur remote controll

Posted on Nov 20, 2009

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Samsung 5271f. Picture usually great but sometimes when an image with horizontal lines appears (e.g. crawl at the bottom of the screen) picture jumps and flickers. Reverts back after crawl disappears.


If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Line faults & possible causes to LCD & Plasma screen are given with illustrations. You can get an idea about the fault to an extent. Faults to all LCD & Plasma screen are similar, irrespective of its brand and screen size.

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Check its main power supply regulator board. The fault is there. Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. Surf the site with patience. Pull up older posts.
http://electronicshelponline.blogspot.com/

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I just serviced this model, same problem as noted. I did a resolder job on the power/drive PC board. This was NOT the problem! The problem acts like an electrolytic capacitor issue or horizontal drive amp. Once I get my hands a service manual & schematics, we'll resolve it. I'll post my results AFTER Super Bowl.

Rick Macy
BC Electronics
Macy41@aol.com

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1 Answer

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It sounds like you may be on the right track. Also you could have a problem in your Horizontal Deflection circuit. Since you say it flickered, you may have a solder joint that was arcing. Probably in the horizontal circuit. I found a capacitor which was arcing in this circuit. I was a small disk type. NOW since it is chirping, the horizontal output transistor may have shorted placing too much of a load on your power supply. The noise you hear is the power suppply trying to start. Stargazer

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