How To Repair A Tv Main Board
Electronic Lath Repair
Electronic board repair (or motherboard repair) can be very complicated and in most cases is not a do-it-yourself friendly repair; withal there are a few mutual failures that yous can repair yourself with help from this page and a few tools.
Identifying electronic boards
In the apparatus world, we can interruption down the types of electronic boards into categories: main board, relay boards, logic boards and user interface boards.
On some appliances all of these boards are made together and others these boards are separated.
Logic Board
A logic board is where adding and programming is done. These types of boards do not typically fail in a mode that is do-it-yourself friendly, so I volition not talk about these boards on this folio. This type of board is identified by having small chips, resistors and capacitors.
Relay Lath
A relay board is a board filled with relays that are controlled past a main lath. Oftentimes this board is made onto the main board, meaning all the relays needed are on the chief lath; therefore, at that place is no need for a separate relay board. These boards are identified by having large relays and some larger resistors and capacitors. These boards are the most mutual boards to accept an like shooting fish in a barrel electronic board repair.
User Interface
A user interface board is a board that receives input from the user. Information technology then signals the principal board telling it what the user intends to practice, such every bit if you employ broil or broil on your oven or you want to run a fragile wheel on the washer. Typically, there is simply one user interface but on some appliances there tin be multiple user interfaces.
Chief Board
The main board uses the information given by the user interface and the logic lath then energizes the relay board appropriately. Note that all of these types of boards can be made into i principal board. Information technology is very common to see the relay board, the logic lath and the main board all in one and sometimes the user interface is also on the aforementioned made onto the same lath.
Bad Solder Joint
Look for bad solder joints on the relay board or any board with big relays.
Solder joints are what hold all the components onto an electronic lath and on relays that deport a lot of current (such as a bake unit of measurement relay) the solder joint will ofttimes fail.
A bad solder joint is the most common electronic board repair that can be performed yourself. If your appliance has a relay board (can be on main board as discussed to a higher place) that controls all components of the apparatus and there is a trouble cheque the failed component first and then expect for a bad solder articulation.
For example, if your oven bake unit of measurement fails first, check for a bad bake unit or a loose connection and if you don't find a problem so you tin look for a bad solder joint.
Get-go, disconnect the ability to the appliance you are working on. So locate the relay lath; note that if there are big relays on the main board your appliance doesn't probable take a relay lath because all relays are located on the primary boards.
Once you have located the relays, take note of the location of wires connected to the board. Take pictures or draw a diagram that shows how to reconnect the board.
Next, disconnect the board and await on the reverse side of the board for burnt or dry solder joints.
Some boards are encased in a plastic housing. On these controls yous must gently remove the control from the housing to see the back side of the control. Be conscientious not to break the plastic housing because y'all will not exist able to reinstall the lath later on the repair.
Burnt Solder Joint
A burnt solder articulation is easily spotted by a black burnt solder joint. In this case, you will accept to evaluate the burnt spot on the lath. Is the only thing damaged past the burnt solder articulation is the solder joint itself? If there is more harm to other components on the board you will likely exist better off replacing the board. If the only part that is damaged is the solder articulation itself you can repair this (see department beneath).
Dry Solder Joint
A dry out solder joint is very difficult to spot and y'all will likely need a magnifying glass. A dry out solder articulation is when a solder joint volition crevice all the style around the joint causing a break in the connection. This is often a cause for an intermitting issue considering the fissure will make contact sometimes and others it will not.
Repairing a Solder joint
One time you have found a bad solder joint, the electronic lath repair is piece of cake. All yous have to do is solder the joint. Pick up a soldering iron and minor diameter resin core solder. The resin core is a flux that blocks oxidation on the joint then that the solder will menses onto the articulation and stick.
- First clean the tip of your soldering iron.
- Then get your soldering iron hot and coat the tip of the iron with solder
- Then heat the joint to be repaired.
- Now identify solder on the articulation opposite of the iron. This will make the solder run toward the atomic number 26 because it is attracted to heat.
Everything you need can be found at your local RadioShack.
Things you don't want to do…
You don't desire to put solder on the iron get-go when soldering because the resin volition be burnt off and you volition non get a good solder joint.
Y'all don't want to put the solder on the joint earlier information technology is heated because the solder will not stick.
You don't want to apply solder without flux because information technology will non stick. Resin cadre flux is recommended.
This is a very useful video I have constitute to help with electronic lath repair.
Broken Usher
On electronic boards, in that location are picayune flat wires that carry current around the board and out to components on your appliance. Sometimes these apartment wires will suspension causing the board will fail.
To set this yous can solder a jumper wire onto the lath to supercede the apartment broken wire. To practise this, trace the wire back to the nearest solder joint then trace dorsum the reverse way to the nearest solder joint. You will then solder a jumper wire between these ii solder joints. To do this, melt off the existing solder off of each joint, and then find a small-scale wire that you lot tin wrap around the pivot. Solid wires are easier to handle only it can exist hard to detect a small solid wire and then you can use stranded wire if you twist it tightly. Once you have the wire wrapped around the pin, use the same soldering technique outlined in the above paragraphs and the video.
Clean Ribbon Cablevision
User interface boards are often connected to chief boards past a flat cable called a ribbon cablevision. The flat cable has connections at the end of the cable that are inserted into a connector on the board. Sometimes this connection can become muddy and cause an unresponsive user interface. Cleaning the ribbon is an easy electronic board repair you can do yourself.
Locate the main board and look for a flat ribbon cable and unplug it. The standard way to clean this ribbon is to rub it with a pencil eraser. All yous have to do is rub the connection end to make clean it. This may set your problem.
If this doesn't work, information technology can be the user interface or the main command. This can be very difficult to effigy out which one is the culprit.
Electronic Board Repair Beyond Your Abilities
If your electronic board is broken beyond your repair power there are other options. You can have your board repaired professionally or you tin can replace the lath. Sometimes boards are no longer available and sometimes they are very expensive in which case it may be best to accept the lath repaired.
FixYourBoard.com Is an electronic board repair visitor that specializes in boards that are no longer available. To have them repair your board the outset thing to exercise is discover the part number to your board. Then check there website to run into if your board is on the list of boards they repair. If your board isn't on the list contact them with your office number to see if they can repair your board. Once you find your part number on the list click on information technology and yous volition find the price for repairing your board. This price includes return shipping and 2 years warranty.
Render From Electronic Board Repair
How To Repair A Tv Main Board,
Source: http://www.appliance-repair-it.com/electronic-board-repair.html
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