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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
LG 42LC7D

 
 


canizales101
New User

Mar 18, 2010, 9:16 AM

Post #1 of 8 (17409 views)
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LG 42LC7D Can't Post
This TV has an intermittent stby power loss, the front power LED does not come on. If the AC chord is unplugged a few times it comes back on with normal operation. The Main control logic board is the problem because I've replaced them with new boards. I'm trying to repair these board to component level to resell them because they are otherwise new boards.These seems to be a factory defect. I suspect the reset circuit on these boards. I'm trying to find schematics or component information for these boards. The LG 32," 37", 42' models use these boards.



linear
New User

Mar 8, 2011, 12:34 AM

Post #2 of 8 (17230 views)
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Re: [canizales101] LG 42LC7D [In reply to] Can't Post
Yes, I'm experiencing this problem too.
Anyone have any more info on this?

I have found a service manual with schematics at
http://www.jordansmanuals.com/default.aspx?Brand=LG&Product=TV-LCD

This manual includes the reset circuitry, but I haven't dug into it.


richpart
User


Mar 8, 2011, 1:16 AM

Post #3 of 8 (17230 views)
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Re: [linear] LG 42LC7D [In reply to] Can't Post

From Service

Bulletin#: 0IVL20080317

Symptom

There is a delay when the TV is turning on.

Models

Applicable serial from 802MX~ to 804MX~ (manufactured before june 9, 2008).

26LC7D-UK, 26LC7DC-UK, 32LB9D-UJ, 32LC4D-UJ, 32LC7D-UK, 32LC7DC-UK, 37LB5DF-UL, 37LC7D-UK,

42LB5DF-UL, 42LC4D-UJ, 42LC7D-UK, 47LB5DF-UL, 47LC7DF-UK, 52LB5DF-UL.

Solution

The software of TV has to be updated. Update the firmware using a USB flash drive. For warranty

work, you have to write this service bulletin number “0IVL20080317” in the remark or description

cell.

Update Instructions

1) Copy the firmware to a USB flash drive in a folder named “LG_DTV”. Only copy the file for the model

you are currently updating.

For -> 52LB5DF-UL

47LC7DF-UK

47LB5DF-UL

42LB5DF-UL

37LB5DF-UL

File name: Chicago07-MERGE-LU-FHD128-v0311.epk

For -> 26LC7D-UK

26LC7DC-UK

32LC7D-UK

32LC7DC-UK

37LC7D-UK

42LC7D-UK

32LC4D-UJ

42LC4D-UJ

File name: Chicago07-MERGE-LU-WXGA64-v0320.epk

For -> 32LB9D-UJ

File name: Chicago07-MERGE-LU-WXGA128-v0306.epk

2) Turn on the TV and insert the USB drive into the TV.

3) If the firmware is newer than what is already installed, the upgrade menu should open automatically. If the update

menu doesn’t open, press MENU on the remote and select OPTION. Now press the 7 key 7 times and the upgrade

menu will open.

4) Select START and press ENTER on the remote to start the software upgrade.

5) The TV will copy the update from the drive and then install it. Do not turn the TV off until it is finished.

6) The TV will automatically turn off and back on after the upgrade is successfully finished. You can now remove the flash

drive and use the TV. To check the current firmware version, press the instart button on a service remote control.









Knowlege is King Baby!!!


Ralph2
New User

Jul 2, 2012, 4:54 PM

Post #4 of 8 (15266 views)
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Re: [richpart] LG 42LC7D [In reply to] Can't Post
Bumping an old thread sorry.

Does anyone know where to get this firmware? I have the same problem.


74f100
Enthusiast

Jul 3, 2012, 12:00 AM

Post #5 of 8 (15249 views)
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Re: [Ralph2] LG 42LC7D [In reply to] Can't Post
You may be able to find it on the web.

To the best of my knowledge, these are only released to LG service centers. I have to log on to their service center support areas to get firmware.
HDMI not working



Ralph2
New User

Jul 3, 2012, 5:36 PM

Post #6 of 8 (15240 views)
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Re: [74f100] LG 42LC7D [In reply to] Can't Post
Where on the web? Google wasn't turning anything up for me.


74f100
Enthusiast

Jul 3, 2012, 9:33 PM

Post #7 of 8 (15233 views)
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Re: [Ralph2] LG 42LC7D [In reply to] Can't Post
That's my only suggestion.

I'm an LG service center,,,I am used to going through them, so I really don't have any experience finding their firmware any other way.
HDMI not working



74f100
Enthusiast

Jul 11, 2012, 12:37 AM

Post #8 of 8 (15148 views)
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Re: [Ralph2] LG 42LC7D [In reply to] Can't Post
One suggestion on what I've seen with these, check for cold solder near the tuner.

My set in the living room had that problem,,,with mine there is also a crack internal to the main, so it won't run with the back cover screws into the main. But the no stdby problem was cold solder.
HDMI not working


 
 
 


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