Question about LG M4200C 42 in. HDTV-Ready LCD Television

Open Question

LG LCD Tv picture goes black but the sound still works

I really hope someone can help, as this is really starting to annoy me. Aout 5 minutes after turning the TV on the picture suddenly goes black although the sound is still fine. It does the same thing after I turn it off for about a minute adn then turn it on again. I've tried switching channels and the picture is darker for about 5 seconds and then goes black again..... Please someone help, don't know if it's something to do with the settings or a problem with the TV. My sister has exactly the same and hers is fine.... Thanks in advance.

Posted by on

4 Suggested Answers


Depending on your electronics skill, they can be replaced with new replacement boards. Usually the inverter boards that drive the backlights tend to blow. Soo its not really an expertise repair unless you know what your doing. The lcd tv's ive fixed the backlights are all on a 2 pin connector.

Posted on Oct 15, 2007

  • 2 Answers

SOURCE: frozen picture on LG LCD 37"

Try One of your working TVS and connect it to your cable outlet of the TV that is having problems. If that TV Does not work then there may be a degraded fitting or the Leg coming of the splitter to that outlet could have a Low Signal Problem
Next Take the First TV that was not working properly and put it on the cable outlet of one of the TVs that is working properly and if the TV set works on that Channel then you know it is not your TV that it must be the cable

Posted on Feb 28, 2009

  • 17129 Answers

SOURCE: LG 37LC2D TV - after

This is a sort of slow start up and it can be a fault in the Power supply as the voltage builds up or in the display drive section where the fault seems the same as a circuit trying to act upon. There is a defined failre but only if the observations of the voltages are taken out and confirmed.
Start with the Power supply and check if the filter and storage capacitors are topped up with the designed voltage, if there is slow build up then check the reason if in the drive for poor swithching or a poor capactior.
Next check the same with the main board , look for IC's getting warm , if so use a freeze it to cool and set the picture to start up therby confirming the IC. repeat check, observe for heat and changes in voltage.respond
please try this link for tips:

Posted on Oct 02, 2010

  • 431 Answers

SOURCE: My LG Lcd tv takes a minute or so to turn on then sometimes the picture flickers and goes out. The tv is on but no picture or sound. When I try to use the menu button on the tv it doesn't work. Whe

The fact that you have no menu or onscreen display, leads me to believe that it is the main logic board. Either the processor ic or the voltages going to the main board are missing. Check to see if the main board is getting 5v and 3.3v to determine if it is your power supply not supplying the voltages or your main board.

Posted on Oct 31, 2011

Add Your Answer

0 characters

Uploading: 0%


Complete. Click "Add" to insert your video. Add


1 Points

Related Questions:

1 Answer

LED screen comes on and goes black


? 5:29
Jan 25, 2013 - Uploaded by Tampatec
Common LG LCD TV REPAIR - NO PICTURE OR BLACK SCREEN FIX ... I have a LG 42PM4700-UB plasma tv that justwent black. The red ... I had to keep turning on and off the TVseveral times for the screen to come back.

LCD & LED TV Repair - No Image & Blank Black Screen ...

? 5:56
Sep 15, 2014 - Uploaded by
LED & LCD TV How to Diagnose Symptom of No Image on theScreen CLICK ... Tv was working fine when left to go to store and came back to blank picture and ... my samsung tv it turns on but its completely black and no sound at all ... LG LCD TV REPAIR - NO PICTURE SCREEN FIX REVIEW - Duration: ...

LG LED TV has no picture (black screen) but still sound ...

Dec 09, 2015 | LG 47LS4500

1 Answer

Lg 26 inch tv flat screen, no picture but sound ok!

The inverter needs replacement. You should be able to get one from

Nov 03, 2012 | LG Flat Panel Televisions

1 Answer

Black shadow on 42 inch LG lcd tv its like a ligtht goes off then black lines then picture comes back

You have answered you question yourself:

You have a loose connection inside---may be a plug or connecter inside or a physical problem on one of the boards or even the main display panel.

Someone has to open it and see what they can find by probing the chassis in different areas.

Mar 22, 2012 | LG 42LG30 42 in. LCD HDTV

2 Answers

LG LCD TV/DVD - I have full picture and sound with

is a mute function enable or a defective control board. Needs to be checked. send to repair store.

Jan 16, 2010 | LG 42LB1DRA 42 in. LCD Television

1 Answer

After few minutes LCD picture went black but sound works ok

most likely the power inverter, also suspect the p/s. best to have a trained tech check it. Julio at

Jul 21, 2009 | Memorex MLT3221 32 in. LCD TV

1 Answer

Invalid format

Try rechecking all wire connections for proper placement and fit too and from the tv.
Try adjusting the video format on the DVD, flip through 480p and 1080i. See which format works best with your tv. Do the same with Wii.

See if this helps.

Jun 13, 2009 | LG 42LG70 42 in. LCD HDTV

1 Answer


Well, not completely true; the fluorescent backlight is still a high voltage device, even if only hundreds of volts instead of kilovolts, and either the lamp(s) or the power supply for it (them) is causing the dropout of your picture. When it does it next time, look at the screen from various angles, I think you will see that video content is still there.  

Jun 05, 2008 | LG 47LC7DF 47 in. LCD HDTV

5 Answers

No picture after 20 mins on LG LCD Tv

i have a 32" lg hd flat screen an it now does the same thing i got it on boxing day an its not even 5 months old

Feb 21, 2008 | LG RZ32LZ50 32 in. LCD Television

1 Answer

Sound but No Picture

Perhaps your remote is set to video recorder?  Try that first, and if no response, try calling up a menu on your TV and look for the Picture Settings.
Good Luck.

Nov 03, 2007 | LG 37LP1D 37 in. LCD Television

Not finding what you are looking for?
LG M4200C 42 in. HDTV-Ready LCD Television Logo

Related Topics:

59 people viewed this question

Ask a Question

Usually answered in minutes!

Top LG Flat Panel Televisions Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17129 Answers


Level 3 Expert

18259 Answers

The Knight
The Knight

Level 3 Expert

66623 Answers

Are you a LG Flat Panel Television Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides