Re: LG 47LC7DF-UB No video issue
Unfortunately I can't read Chinese either. I may try to find an online translator. In the meantime, it seems like we have it narrowed down to the mainboard, would you agree? At some point it may be better for me to look into a replacement board for time's sake.
Vinceroger69, thanks for the link. I will check the v chip firmware out.
UsAndThem
Member
Last Activity: 02-09-2014, 10:57 PM
Joined: 09-10-2012
Location: Bryan, Texas
-
Re: LG 47LC7DF-UB No video issue
The tv has both a usb and a rs-232 portLeave a comment:
-
Re: LG 47LC7DF-UB No video issue
There is a picture reset in the users menu but I have tried that and it has not shown any change. Is there a chance that the main board could be re-flashed with the correct epk or other file. Do you have any opinion on whether the voltages measured at the power supply I listed are appropriate? I am inclined to think there may be a fault somewhere on the main board but I realize my intuition doesn't really mean much when it comes to the way the board functions.Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
I have attached some images of the 1st level of the service menu. I have sub levels photographed and can upload as necessary. Let me know if you see anything you want me to try. I also included some test screens.
Brian...Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
I checked under all available menu's and sub-menus. I can take pictures of each if that will help determine if there are any useful menu optionsLeave a comment:
-
Re: LG 47LC7DF-UB No video issue
I was able to get into the ADJUST DATA menu but there didn't appear to be a reset option. After looking through the menu and sub-menu options I cycled the TV and the blank screen conditioned returned. With the blank screen, I held the menu button on both the tv and remote. I did observe the screen brightness increase after holding the buttons for 10 seconds or so. It appears that the tv can still be controlled, volume up/down, channel change, etc. even when the tv is in the blank screen conditionLeave a comment:
-
Re: LG 47LC7DF-UB No video issue
I am willing to try and troubleshoot the main board until it no longer becomes feasible (lack of equipment, skills etc.) . I'll look in the ADJUST DATA menu for a RESET or similar option.Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
The banding does not occur when the screen is blank. There appear to be two states. One, An image is visible with the horizontal banding and two, when there is no image and the screen is solid black(one even shade), but illuminated.Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
I also tried flexing around the edges of the bezel and observed no changes in the image behavior.Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
I was able to get the service menu up and the menu itself looks fine although the horizontal banding is still there. I also noticed that a ghost of the previous menu will remain. I have only been successful at getting the "NO SIGNAL" condition after I leave the TV unplugged for an extended period of time. If I have the "NS" condition and cycle the TV, all I get is a blank screen....Leave a comment:
-
Re: LG 47LC7DF-UB No video issue
I'll have to put the boards in, power it up and see if I can get an image to return so I can try flex the frame. Are you thinking the panel could be bad? Prior to measuring the voltages, I re-flowed the current capacitors to ensure there were no cold joint issues and since then, I haven't been able to get the menu or an image back...only a blank screen. Regarding the existing capacitors, I already have a replacement set on order for the CapXon ones in case thats the problem. Either way it could be one in the future so better to fix it before (hopefully)...Leave a comment:
-
LG 47LC7DF-UB No video issue
Hi, I have been lurking around the site for a while reading posts and searching to try and avoid members having to repeat themselves but I've finally decided to register and begin participating. I am hoping that you all might have some insight into isolating the source of the issue I'm having with my tv. I believe I have narrowed it down to the power supply or main board but would like some ideas on how to confirm it. To start I apologize for the long post. I am hoping to get as much of the meat and potatoes out on the table to minimize the back and forth with little stuff.
...
No activity results to display
Leave a comment: