Subscribe to newsletters

Vizio M550SV main board 3655-0342-0150 / 3655-0342-0395 - serviced, tested, $70 credit for old dud

A functional Vizio M550SV LED TV main board that can fix totally dead or stuck on Vizio splash TV or no sound or HDMI inputs

Coppell TV Repair LLC offers functional replacement for Vizio main board 3655-0342-0150 / 3655-0342-0395 shown on the picture and used in Vizio M550SV LED TV.

The board you will receive may be the same or 100% OEM compatible version (often times manufacturers have several diffrent releases for the same board and often times we learn for equivalents after some time on the market), but in all cases it wil be tested and/or serviced by Coppell TV Repair LLC service specialists.


You are purchasing a functional module that is same or 100% compatible with the one advertised in the subject of this listing.

Upon receiving and installing the module in your set you have the option to return your old malfunctioning dud and receive credit towards the purchase price shown here, subject to the below listed conditions.

The board you will receive can be brand new, used or, most commonly, a board serviced by us, Coppell TV Repair LLC.

Unless it is brand new (which is rare for the modules we offer as we specialize in servicing hard to find or expensive TV boards) it is guaranteed the board will be tested by our staff and there will be a label on it attesting to it.

Before placing an order please ensure that this is indeed the board in your set by comparing the number on it.

From a customer standpoint the service time is much more of a function of our package queue time than the time we spend with a board.

That is because our own business is based on us NOT having to spend more than a pre-detrmined amount of time which is, at most, 1 hour with a board, including two testing windows - once when the board gets in and once it was worked on.

If we don't do the service in our own set time frame we'd end up breaking even at best or, more likely, using money on the repair.

Which is to say that we spend on average no more than an hour with a board.

The reason customers wait for more than that is simply because it takes time from the package's arrival at our processing facility to the moment it gets at the front of the queue and gets picked up for processing.

Pre-COVID-19 queue flushing time was up to 2 business days.

Since about March 2020 the amount of incoming packages has increased and now queue processing time is close to 4 business days.

It is practically impossibel to dynamically regulate the amlunt of packages we receive, just as it is practically impossible to secure quality service technicians on demand.

Please do not call us a mere few days after you sent your package to inquiry about the status of your service!

Look at the tracking number, see when it was delivered, give it at leat 2-3 business days (preferably four) and if you have not heard anything from us then contact us saying the package was delivered on this and that date and we'll go look for it.

It's in everyone's interest that we work as fast as possible and interrupting technicians (who answer the phones) to make them go search for package in the queue only to tell you it's there doesn't help anyone.


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.


Upon receiving and installing the purchased module you can return your old one to receive the advertised credit.

The credit will normally be issued as a partial refund towards your original payment; when this is impossible or inapplicable we may use other forms of payment such as PayPal or check.

It takes 2-3 business days after the delivery of your board to us for it to be processed and the refund issued.

In order to receive the full advertised credit the returned dud must meet all of the following conditions:

1) It must be sent back within 14 calendar days of the delivery of the module you purchased from us, both per carriers' records. Make sure you keep your tracking number, you may need it!

2) The board must arrive in good physical condition allowing subsequent electrical repair and reuse of the board. Sometimes when components fail and burn they also leave burn marks on the board. Most of the time such traces are not affecting the ability to restore the board's functionality, but in some extreme cases this may be a problem.

3) The board must not have missing or replaced components or have otherwise been tampered with.

Exceptions vary from all 3 listed conditions, but we reserve the right to be the judge on whether your board qualifies for an exception.

If a board arrives that does not meet the above conditions and we do not consider it appropriate for extension we will contact you and offer you to get it back for the sole cost of the return shipping and/or offer you a trade-in price we consider reflecting its condition.

The returned module must arrive in good physical condition and without previous traces of repairs or tampering in order to qualify for the full advertised credit.

Modules that do not meet those criteria will be subjected to partial refund or no refund at all (depending on their condition and trade-in value).