We are going to be giving a general overview of LCD TV Repair and take a look at the different
components in LCD TVs and what can go wrong with these components and their symptoms and
also how to diagnose the problems and hopefully get them fixed.
If you are having a problem with your TV be sure to check your model number first. This
is what appears in this box over here. Every TV is different, this is a Sony LCD TV but
you will see the model number over in a box like this. The model number and serial number
are very important as that is what will help you to identify what parts are needed to repair
your TV.
So the first thing you are going to want to
do is make sure you have unplugged your TV from any power source and you have grounded
yourself properly. Next you will want to take out the screws in the TV that are holding
the back cover on. Every back cover of a TV is different but most are held in by screws
and can easily be removed. So we have removed all of the screws here on the back of the
TV and now we are going to remove this back panel.
We will start by just identifying the different parts of the TV and then we will talk about
them individually. So first we will look at the power supply which is right here in the
middle of this TV. The power supply takes in power and distributes it throughout the
TV. The power supply is typically connected to a power cord or an AC adapter. The main
board which is over here typically manages all of your inputs and outputs for your video
and sound. You will see here on the main board that we have RCA connections, a VGA connection
and HDMI connections amongst others. You will also see here that we have these wires that
run to the speakers for the TV, so again this will control your audio and video inputs and
outputs. Over here we have the backlight inverter this
part can often be covered by a metal or plastic cover. You might have to take out some screws
to get to this part if you are going to replace it. The backlight inverter is what controls
your CCFLs or light source for the TV. The last part we are going to look at is the
T-Con board. The t-con board will sometimes be sitting right here on a TV, but for this
one it is slipped into this little area right here. The t-con board connects this LVDS cable
right here to the main board. This cable is extremely fragile so anytime you are working
with it you will want to be very careful. One thing to consider is that not every TV
is going to be the exact same. So not every TV will just these four main parts, it may
have more and it may have less. Some of the parts might be connected where you will have
backlight inverters and power supplys on the same board. There are typically two different
levels of repair for TV parts. You can open up your TV find the board number and then
look up that board number to find a replacement part or you can take your board and try and
repair it at the component level. At the component level you would be testing different components
on the board to be sure they work. The first board we are going to look at closer
is the power supply. The power supply takes in power and distributes it throughout the
TV. Now the first thing that could go wrong here is that the TV set will not turn on.
If you are not able to turn on your TV, the first thing to check is that the outlet works.
Plug something else into the outlet and be sure it turns on, be sure that the outlet
works before you start taking apart your TV. If the outlet works and you are still not
getting power to your TV. You will want to take a look at the power supply. Power supplys
will have a fuse on them. You can check the fuse to see if it is blown and if it is, you
can try replacing that and plug the TV back in. If the TV powers on and the fuse stays
good, you should be set to go. If the fuse blows immediately right when you plug the
TV back in, then you will have another issue on the board that is causing the fuse to blow.
If you are going to check your fuse on the power supply, it can be a little bit more
difficult. Some fuses are ceramic and you would need a meter to check that fuse and
see if its bad. Some common things to look for on these boards
are blown capacitors where you have a capacitor that becomes raised at the top or is leaking
fluid. The next board we are going to look at is
the main board. The main board controls your video and audio inputs and outputs. The first
sign that there could be something wrong with your main board is if your picture on your
screen is not appearing. You plug in a blu-ray player to your HDMi connector and it does
not work, or you have your cable box connected anywhere to the main board and you are not
getting a picture on the screen. If this is the case, I always suggest that you check
the source to be sure it works on a different TV.
Now it is possible to repair the main board at the component level but it can be very
difficult at times. Component level repairs take a lot more knowledge and expertise, board
repairs you typically just have to remove the screws and carefully remove these connectors
and then you can put a new board right in there, put the screws in and reconnect the
connectors and you should be good to go. Typically we recommend that you replace the entire board
as that will be easier and faster for your TV Repair. You would want to look up the board
number off of the damaged board on our website and find compatible replacement for this board.
You can also search your TV model number on our website and that will show you all the
compatible parts for that TV model number. Typically with a main board you will see a
lot more video issues than you would audio issues. One of the most common issues if having
a bad HDMI input. Up here we have the T-con board. The t-con
board is what connects your main board to your LCD panel through the LVDS cable. This
cable is very fragile so you will want to be very careful if you are disconnecting it
at any point. One common symptom of a bad t-con board is
if your TV has backlights and sound but there is no picture. So lets say you have your cable
box connected to your TV, you turn it on and you are able to hear the show that is playing,
but you are not able to see the image that means most likely there will be an issue with
your t-con board. Because you are getting the sound from the main board, but you are
not getting the image through the t-con. Another common problem with the t-con is that
you can get colored vertical lines on your screen or half of the screen is missing the
picture. Now, something that is a little bit unique about this TV is that the t-con board
is bonded into the panel, so you would not be able to replace this t-con board, but now
we are going to take a look at a TV where you would be able to replace the t-con and
it is located out here on the panel. You will just have to remove the screws that
hold the t-con to the panel and then disconnect the connections very carefully especially
the LVDS as it is very fragile. Some t-cons can also have ribbon connectors and you will
want to be very careful removing those as well. We will show you a video right now on
how to remove the ribbon connectors. Using your finger flip up the tab on the ribbon
connector and gently remove the ribbon, please do not use a screwdriver to open ribbon connectors
as it can cause damage to the pins. Gently guide the ribbon back into the connector,
match the line printed on the ribbon cable with the edge of the connector and close the
tab on the top. So, the last board we are going to look at
is the backlight inverter. The backlight inverter again, takes the power from the power supply
and turns on the lights that supply the light for your TV. The backlight inverter is typically
connected to the panel and you will want to be very careful when you are removing any
of these connections. There are different types of connections from the backlight inverter
to the panel and typically most are fragile. Some common problems with the backlight inverter;
so if you turn on your TV and you see the image show up on the screen for a second and
then the TV goes black it could be your backlight inverter that is causing this problem. So
if you have sound but you do not have an image it could be the backlight inverter that is
causing this problem. Thank you for watching our LCD video.
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