Samsung La40R81Bd 40In Lcd Tv Main Board Eeprom Replacement Repair Guide

Difficulty

Very difficult

Steps

Time Required

                          1 - 2 hours

Sections

Rear Cover
1 step
Main Board
1 step
Replacing faulty EEPROM on main board (Clicking relay symptom part 2)
1 step

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Introduction

You will be able to remove the main board and locate the likely faulty EEPROM. This guide is accurate for the LA40R81BD model however there are many similar models that experience similar issues so you may find it useful in repairing other model Samsung TV’s

What you need

Step 1

              Rear Cover

Unplug power cable and all AV cables from rear of TV and carefully lay TV face down on a clean flat working surface ensuring that you don’t damage the LCD screen.
Using a Philips driver remove the 18 screws from the rear panel.
Gently lift the rear cover off the TV. You may need to wiggle the cover a little however there are no clips holding the cover on so it should come off easily if you have fully unscrewed all 18 screws.

Unplug power cable and all AV cables from rear of TV and carefully lay TV face down on a clean flat working surface ensuring that you don’t damage the LCD screen.

Using a Philips driver remove the 18 screws from the rear panel.

Gently lift the rear cover off the TV. You may need to wiggle the cover a little however there are no clips holding the cover on so it should come off easily if you have fully unscrewed all 18 screws.

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Step 2

              Main Board

Gently peel away the conductive fabric from the metal cover on the board
Remove 5 connectors from the board
Remove 6 screws from the perimeter of the board.
Lift the main board away from the chassis ensuring you don’s snag or catch any of the cables.

Gently peel away the conductive fabric from the metal cover on the board

Remove 5 connectors from the board

Remove 6 screws from the perimeter of the board.

Lift the main board away from the chassis ensuring you don’s snag or catch any of the cables.

Step 3

              Replacing faulty EEPROM on main board (Clicking relay symptom part 2)

Turn the main board over to expose the side that was facing the chassis and locate IC1803 (24C256 integrated circuit).
Carefully remove the old EEPROM being careful not to damage the copper pads or tracks on the board
Use solderwick to carefully clean the pads where the old EEPROM was mounted
Install the new EEPROM ensuring you orient pin 1 of the new device with the correct location on the board.
I used an AT24C256C-SSHL-B 8SOIC integrated circuit. There are a number of compatible devices but be sure to get the correct lead spacing to fit the board.
Check the solder joints with a magnifying glass to ensure there are no bridges between the EEPROM pins before you reassemble and power up the TV
The IC 1803 designation and location on the board is specific to the LA40R81BD model TV.
When you power up the TV it may cycle a few times before turning on normally. This is due to the EEPROM being blank and default data being written to it. This is normal. You will need to reset all customised parameters and the date/time in the main menu.

Turn the main board over to expose the side that was facing the chassis and locate IC1803 (24C256 integrated circuit).

Carefully remove the old EEPROM being careful not to damage the copper pads or tracks on the board

Use solderwick to carefully clean the pads where the old EEPROM was mounted

Install the new EEPROM ensuring you orient pin 1 of the new device with the correct location on the board.

I used an AT24C256C-SSHL-B 8SOIC integrated circuit. There are a number of compatible devices but be sure to get the correct lead spacing to fit the board.

Check the solder joints with a magnifying glass to ensure there are no bridges between the EEPROM pins before you reassemble and power up the TV

The IC 1803 designation and location on the board is specific to the LA40R81BD model TV.

When you power up the TV it may cycle a few times before turning on normally. This is due to the EEPROM being blank and default data being written to it. This is normal. You will need to reset all customised parameters and the date/time in the main menu.

To reassemble your device, follow these instructions in reverse order.

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                                                                                      10 other people completed this guide.

Attached Documents

AT24C256-EEPROM-Data-Sheet.pdf
PDF - 900.91 kb
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AT24C256-EEPROM-Data-Sheet.pdf

PDF - 900.91 kb

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                    Richdave

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ABDUL RAZAK - May 16, 2016

I have a problem with my LCD , it blinks 6 times the switches off.

I also need to know were the memory IC is located and how to replace it.

The model is LE32C350 (Samsung)

jstone6651 - Jan 10, 2017

My Samsung TV has no picture and sound power light blinks I changed the T con board still the same what can it be thanks JOHN

Please help Samsung TV black screen

Richdave - Jan 10, 2017

victor trujillo - Jan 11, 2017

I am currently working on a few tvs . I have always just ordered a new mainboard and replaced but I have a rework station I used to use for fixing cellphone charging ports so I am considering fixing the main board. my question is can I order one single eprom since they are programmed and use it to fix any tv just to keep a stock of them instead of waiting for the part to come in or the eproms all different.

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