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Equipment Repairs => LCD TV forum => Topic started by: WILLYAM1 on November 26, 2012,12:06:13

Title: LG-42LC7R-TA
Post by: WILLYAM1 on November 26, 2012,12:06:13

Hi to all.
this tv came with a flickring led and tv dosnt come o the backlight is coming butn.
i change all bullging capi .
now tv come on ther is a audio but no screen .
can see  a backlight but no osd no pic.
i check the small fuse in the tcon board is OK.
all volltage in p.s are ok exept the 3.4v.
the p.s is EAX37617801 ANY SCHEMATIC .?
DOSE ANYONE KNOW THE PROBLEM?.
WILLYAM1

Title: Re: LG-42LC7R-TA
Post by: WILLYAM1 on November 27, 2012,12:34:59

hi.
got another lg with the same p.s and i change all capi and tv work.
i placed this p.s to the  first lg and its the same problem.
it seem the the 3.4v is a option.
now the problem seem to be main board.
maybe a reset anyone knows how to reset the lg lcd?.
chasis lp 78a.
willyam

Title: Re: LG-42LC7R-TA
Post by: sparky on November 27, 2012,12:58:39

hi
think you may need service remote tv tony might help you
good luck
dave

Title: Re: LG-42LC7R-TA
Post by: WILLYAM1 on November 28, 2012,03:24:36

thanks sparky.
how we get the service remot?is rhe remote of the tv isent well to solve the problem?.
willyam

Title: Re: LG-42LC7R-TA
Post by: sparky on November 28, 2012,05:16:00

hi
its a special one charles hyde sell them i believe
dave

Title: Re: LG-42LC7R-TA
Post by: sparky on November 28, 2012,05:22:02

found this during a google search
I have the LG 42 LB5D. I dont know how yours works but mine has 2 serivce menus. To access them on my set I hold down menu on the remote till it asks me a password then I hold menu on the TV and that gets me into the "confusing" menu if I exit that and do those steps again the EZ setup menu comes up which allows me to make more advanced tweaks than the picture settings in the main menu. Hope this helps.





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Title: Re: LG-42LC7R-TA
Post by: WILLYAM1 on November 28, 2012,05:33:28

thanks sparky.
i put an output to anoyher tv and its showing pic and also an audio.
i als o check and ther are analog signals in the lvds cabel and input signals in the tcon board.
 i pulled out the left of the ribbon  cable and i saw half of the screen is black and the other half is gray no pic.
same dignosis with the right ribbon.
all volltage in TCON BOARD ARE OK.
VGH VDD VGL AND 1.5V IN REG.nothing is hot no shorts.
could be tcon or again a reset? any idia? willyam

Title: Re: LG-42LC7R-TA
Post by: WILLYAM1 on December 17, 2012,10:33:07

Hi to all.
got a tcon put it but itd the same problem.
help.........
willyam1

Title: Re: LG-42LC7R-TA
Post by: zica on December 22, 2012,17:24:49

On my 37" LG i need an ON-signal from mainboard to psu, to get 3.4V.
Do you have this on-signal?

Title: Re: LG-42LC7R-TA
Post by: WILLYAM1 on December 23, 2012,12:21:44

thanks zica.
i got the on signal from main to p.s board.
got another same tv today and after repairing p.s i put the main to the oldest lg  and the tv works .
i will try to repair the main board if no succses i wiil order one.
thanks willyam1