37" lg tv pixelated screen help

[johnjgjohn]

Ho all i have 37" lg tv works fine for first 20 mins Then screen starts getting jumpy like what happens to freeview with a bad signal. It get worse the longer it on so must be heat related ive checked for dry joints and bulging caps on psu all looks ok heres a video of what its doing
http://youtu.be/hkgiG7O7Jm0
Not sure what to do next any help appreciated thanks

[tom66]

Re: 37" lg tv pixelated screen help

You need to include model number of the TV & supply photos of the parts inside the set.

[DemonBG]

Re: 37" lg tv pixelated screen help

When the screen starts flickering, is it on all inputs or just on AV? Also, is the OSD affected as well?

[johnjgjohn]

Re: 37" lg tv pixelated screen help

Yeh its all inputs and the osd does it aswell ive tried scart, hdmi, composite and built in freeview
Model number is :- 37lc55-za

[johnjgjohn]

Re: 37" lg tv pixelated screen help

Whole back of tv

[johnjgjohn]

Re: 37" lg tv pixelated screen help

You need to include model number of the TV & supply photos of the parts inside the set.

Are they pics ok tom66

[tom66]

Re: 37" lg tv pixelated screen help

I believe there's a service bulletin regardng this issue, ferrite beads on the main board going bad. Will try and find it.

[johnjgjohn]

Re: 37" lg tv pixelated screen help

I believe there's a service bulletin regardng this issue, ferrite beads on the main board going bad. Will try and find it.

Thanks tom

[johnjgjohn]

Re: 37" lg tv pixelated screen help

I believe there's a service bulletin regardng this issue, ferrite beads on the main board going bad. Will try and find it.

Hi tom did u manage to find any service notes on this

[johnjgjohn]

Re: 37" lg tv pixelated screen help

Can anyone help

[AFajitas]

Re: 37" lg tv pixelated screen help

Try cooling the mainboard when the problem starts, I think you can use a can of condensed air upside down. See if it temporarily relieves the issue.

[johnjgjohn]

Re: 37" lg tv pixelated screen help

Try cooling the mainboard when the problem starts, I think you can use a can of condensed air upside down. See if it temporarily relieves the issue.

It lasts a lot longer with just the back off the tv so its defo somthing thats heating but what would it be how would i find out what part to change

[tn245]

Re: 37" lg tv pixelated screen help

My guess would be this looks like one of the LGs that suffer bad SMD capacitors on the main board. See the recent reply on this thread where Arudge replaced caps on a 37LF65 with a similar problem and resolved the issue. The capacitor numbers are in the post:

https://www.badcaps.net/forum/showth...676#post517676

Can you take the metal cover off the main board (in the middle) and post a close-up pic?

[johnjgjohn]

Re: 37" lg tv pixelated screen help

My guess would be this looks like one of the LGs that suffer bad SMD capacitors on the main board. See the recent reply on this thread where Arudge replaced caps on a 37LF65 with a similar problem and resolved the issue. The capacitor numbers are in the post:

https://www.badcaps.net/forum/showth...676#post517676

Can you take the metal cover off the main board (in the middle) and post a close-up pic?

Here is a pic of board I've changed the said caps so we'll see how it goes

[tn245]

Re: 37" lg tv pixelated screen help

Let us know

[johnjgjohn]

Re: 37" lg tv pixelated screen help

Let us know

Thanks alot tv seems fine now been on few days with no probs

[tn245]

Re: 37" lg tv pixelated screen help

Great to hear!