Author Topic: LG 42LM620T-ZE  (Read 509 times)

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EVILMRB

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LG 42LM620T-ZE
« on: September 21, 2018,19:16:10 »
Hi this TV works for about two hours then I get a thin black line at the top of the screen (as seen in pic 1) and then straight away it drops down about a inch (as seen in pic 2) but at the same time the whole picture jumps at about every 8 to 9 seconds.
Any help would be very helpful, and I have uploaded the service manual for this model on this site if anyone needs it.

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LG 42LM620T-ZE
« on: September 21, 2018,19:16:10 »

jordan

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Re: LG 42LM620T-ZE
« Reply #1 on: September 22, 2018,03:21:14 »
Clean flat cable on T-con board
Greeting from Slovenia
Jordan Čebron

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #2 on: September 22, 2018,10:58:25 »
Thank you jordan, will try that and get back to you. Some tv engineer near me tried telling me I had a duff screen, but I think if that was the case it would not last two hours.

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Re: LG 42LM620T-ZE
« Reply #2 on: September 22, 2018,10:58:25 »

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #3 on: September 23, 2018,00:29:42 »
Hi jordan I cleaned the ribbons from the tcon board and after two hours the line reappeared but the picture was not jumping like before.

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #4 on: September 23, 2018,13:30:36 »
Is it worth me trying a new T-con and ribbons.

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #5 on: September 23, 2018,13:45:03 »
I have upped a video of what this tv is doing,and like I said in my previous post I have cleaned the ribbons like Jordan mentioned this as cured the jumping but the line still appears after about two hours. Any more views would be helpful.

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Re: LG 42LM620T-ZE
« Reply #5 on: September 23, 2018,13:45:03 »

astracat

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Re: LG 42LM620T-ZE
« Reply #6 on: September 24, 2018,17:22:41 »
hi looks like it could be tcon only way to find out is to replace it or try freezer spray while fault is showing
« Last Edit: September 25, 2018,04:46:45 by astracat »

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #7 on: September 25, 2018,17:58:38 »
Cheers will give that a try, will buy freezer spray tomorrow.

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #8 on: October 05, 2018,17:37:59 »
Finally got a new tcon plus cables, installed hour and half later same problem any more thoughts on this tv would be great

astracat

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Re: LG 42LM620T-ZE
« Reply #9 on: October 06, 2018,05:45:34 »
hi if tcon did not work only thing left is ribbon cables to screen, problem is not an easy permanent repair ,try packing between cables and caseing on screen connections fairly common problem
regards
astracat

downunder

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Re: LG 42LM620T-ZE
« Reply #10 on: October 06, 2018,06:22:34 »

You mentioned that the picture was jumping around. It may be stuck in "Auto 3D simulation on start-up" and a bit reluctant to be normal.
A factory reset (service remote needed) and a firmware update might fix it.       

Or it may be defective side tabs on the display panel.                           Bruce                     

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #11 on: October 06, 2018,09:46:40 »
Took the screen apart but this screen as no tabs down either side, will buy something to pack it and let you know later. But thanks for giving advice.

astracat

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Re: LG 42LM620T-ZE
« Reply #12 on: October 07, 2018,17:02:50 »
tabs go from t/con to screen,possibly on top/try pressing one on screen tabs while fault showing use insulated tool to press
regards
« Last Edit: October 08, 2018,04:11:26 by astracat »

EVILMRB

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Re: LG 42LM620T-ZE
« Reply #13 on: October 26, 2018,19:58:57 »
Update: just got new screen for 92 off ebay, all working fine now. Thanks to all who helped.

 

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