dim display backlight?

[jssurfer]

I own a LG47LH40 TV and it suddenly changes picture from a nice vivid pix to a much darker display, then stays that way. It was an intermitted problem but this time it seems to be staying permenantly dim. I am wondering If anyone else has had a problem like this. I thank you all in advance for any help you can give me.. Its a shame to toss the TV... Id like to try and do the repair myself .... worst I can do is break a broken TV right? thanx to all JS

[ben7]

Re: dim display backlight?

Is this an LED or florescent backlit display?
If it's the latter, you can start by checking the inverter transformer(s) for an open circuit high voltage winding.

Also, check for cracked solder joints. Inspect the wiring for the backlight for arcing or bad connections.

Some pictures would help us too

-Ben

[jssurfer]

Re: dim display backlight?

the tv is an LED I am curious if the dimming of the screen sounds like an issue w/ the backlight or could it be something else... I took just the back of the tv off and looked closley w/ a magnifing glass I see no swollen caps or burn marks anywhere... I dont have any paperwork to dissasemble it further and am wondering if there are any instructions to be found anywhere.

[ben7]

Re: dim display backlight?

It could be failing LED(s). It also could just be a dodgy connection. Or perhaps the LED driver is faulty.

I'm not great in the service manual area of things, however there are a few folks on here who are, they likely will chime in sometime soon.

In the mean time if you want you can upload some pictures of the circuit boards and post them on the forum here.

P.S. I just noticed, you live in the garden state as well

-Ben

[budm]

Re: dim display backlight?

Can you change the setting from VIVID to user pref mod to see if you can adjust the backlights (not brightness) level? Also does it have the auto brightness that will change with the room lights? you may try turning that function off.

[jssurfer]

Re: dim display backlight?

reguardless of what I adjust, it stays dim,,, even called LG, the tec. talked me back into the factory settings... still dim,,, w/ auto brightness off picture is still very dark / dim.... its not an adjustmet... I think something's going bad to make it darken like this