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Repair service for LG 31MU97-B / 31MU97B main board 62882801 / EAX66105904 causing dead monitor, loss of HDMI etc.

If your LG 31MU97-B 4K monitor is totally dead and does not respond to the power button you may benefit from this repair service.

Coppell TV Repair LLC offers a REPAIR SERVICE for main board 62882801 / EAX66105904 shown on the picture and used in LG 31MU97-B 4K LED monitor.

REPAIR SERVICE means that you have to send us your malfunctioning board which we will attempt to repair, test and return back to you.

The board's PCB number is EAX66105904 and the same PCB is also used in other models; at this point we can only test visual output for LG 31MU97-B.

Your biggest issue will likely have sending the board for repair will be opening the monitor. We use two or three plastic cards (debit or credit cards, hotel door key cards etc.) which we stuck between the back cover and the TV frame and move them around. Be extra careful, the LCD panel is fairly sensitive and easy to crack and you may not even notice you did!


Advertised price is the maximum price you will pay and includes the return shipping costs within USA. Surcharge applies for international returns.

You start the process through the orange button on the page by filling a short form with your contact information and a brief description of the problem.

An email with shipping instructions is automatically sent once you submit the form to the email address you provide.

You then package and send the board to us. You pay for the shipping to a carrier of your choice and nothing to us at this point.

Once we receive the board and open the box we test it and act depending on what we find out.

If the board arrives in working order you will be charged with a a diagnostic fee of up to $25 plus the return shipping costs, i.e. less than the advertised repair cost.

If the board is bad then we attempt to repair it.

If we succeed we send a payment request for the amount specified in the listing.

If we fail to we send you an email with details and usually only request that you pay for the return shipping and nothing else.

Please make sure your TV has the same board before proceeding with this service or contact us if yours is different to see if we offer repair service for it.

Typical turnaround time is 2-3 business days.

This is the time it takes for a package that was received to move up the queue and get opened.

Once we open the package we usually have about 1 hour to get the case resolved or we will likely end up losing money on it.

Sometimes, depending on situation, we may leave opened box and make another try on the next day.

Note that it is not guaranteed that the queue will take exactly 2 or 3 days to process. Sometimes - especially after long holodays - it can be larger and take longer.

We do our best, but we have no efficient means of managing the work load on demand.


Unless otherwise explicitly stated elsewhere in the listing the boards we sell come with a standard 90 days warranty.

Customer is responsible for return shipping and Coppell TV Repair LLC is responsible for shipping back to customer. Returned boards subject to exchange, service or refund, subject to availability and agreement by Coppell TV Repair LLC and customer.

Returned boards must carry the Coppell TV Repair LLC identification stamp or label and must not have been damaged, modified or otherwise tampered with in order for warranty coverage to remain in force.

Boards returned with request for refund / order cancellation will be subject to restocking fee covering forward shipping cost, transaction cost and $10 fee for the board testing needed prior to slating it for sale again.


The board(s) we receive must be physically intact and must have not been tampered with or serviced before.

The advertised flat rate for repair service is only valid when the above conditions are met.

Exceptions are possible and often applied for minor repair attempts, but we reserve the sole right to judge if and when we would consider a repair minor.

If we receive board(s) that fails the above conditions we will contact the sender and usually offer two options: 1) returning the board(s) for the sole cost of the return shipping; or 2) continuing the repair service at a higher cost in case of success.

It is also possible, depending on the condition of the board, to eliminate the second possibility and just flat our reject having to service the board.

Subject to situation and availability we may also recommend replacement of the board, again at the higher than advertised price for repair.

In all cases you will have the option to receive your own board(s) back for the sole cost of the return shipping.

Board removal hints

One way to open the LG 31MU97-B and BC models is by using old plastic cards like credit cards or rewards cards etc.

After detaching the base with the screws from the back with regular screw driver, you lay the monitor on a flat surface with its face down and carefully insert a plastic card in the middle of either of the two longer sides (top or bottom in landscape orientation).

You will pry a bit to get the card inserted and once you do you will push the card down or up to maintain a good angle, which would allow you to pull it sideways while pushing the locking clips apart from each other; force *is* required in this operation and a clip or two may get damaged, but that is not too common and hardly ever fatal.

The boards are far enough from the edge and it's hard to do additional damage unless you drop the monitor or press too hard with fingers against the LCD.