So here we are looking at a Samsung Plasma TV. We are going to take a look at the different
boards on the back of the plasma TV and describe what each board is responsible for and the
common problems or symptoms that can be shown by a TV and which is most likely responsible
for those problems and symptoms. Some of the boards will overlap with these problems and
symptoms, so there could be multiple boards that could cause no image on the screen or
other symptoms like that. After viewing this video you may have a better
idea of which board is causing the symptoms on your TV.
So, the first part we are going to look at is the power supply which is right here. The
power supply takes in and distributes power throughout the TV. This board is either directly
connected to your AC power cord or is connected to the AC adapter. Some common problems that
can happen with your power supply, is that you have a dead set or your TV does not turn
on and you have no standby at all, then you know that you are not getting any power to
the TV. You could have a situation where you do have standby, but you can't get the TV
to turn on. That could also be caused from your power supply. You could have a bad power
supply also if your fuse blows. This power supply has a few different fuses. If you replace
the fuse or fuses as some have multiple and you plug the TV back in and that fuse blows
right away on the power supply, then you know there is something else wrong with a different
component on that power supply. The main board which is located over here
typically manages your accessory inputs and outputs and houses the TV tuner. So this is
what sends the signal from your HDMI ports, your RCA connectors, your VGA input, all your
different inputs go through here and are connected elsewhere to get the picture on the screen.
If the set in total resets on its own with you doing anything, it could be your main
board that is causing that. If you are having issues with the video on the screen it could
be a connection here or the main board is not allowing you to have the full resolution
or clear image. Again if any of these inputs don't seem to be working with your TV it could
be a bad connection here. The first thing I would recommend you do is
take your source video, so lets say you have a blu-ray player connected to this HDMI port,
take that blu-ray player and connect it to a different TV and make sure that the blu-ray
player is working fine. If you then find out it is working fine, then you connect it back
to this TV, then you will know the main board has a problem or this connection has a problem
because t he blu-ray player works fine. The y-sustain, which is located right here can
also be called a y-sus board, a y-main board, and an SC board. So the y-sustain here, connects
your PDP assembly through a buffer system most commonly known as a y-buffer or y-scan
drive. Which is right here. Some common symptoms of a bad y-sustain, the TV shuts down and
power cycles. That would be your TV turns off, and then turns back on again and then
turns back off and such. So its running through a power cycle. If you have no picture on the
screen, this could also be the y-sustain or if you have a dark picture on the screen.
If you have a flashing screen with shadowy sections, this could be the y-sustain. If
your TV makes a popping noise, which is usually quite loud and then you have no picture on
the screen, this could be caused from the y-sustain.
So, the y-buffer can also be known as a y-scan drive. This y-buffer again is what connects
the y-sustain to the panel. These orange colored connections right here are built into the
actual TV panel and are what connect to the y-buffer. So if you have a problem with any
of these ribbon cables here, they will not be repairable as they are connected right
into the panel. A common symptom of a bad y-buffer board is
if you have black horizontal lines running across your entire screen. They would run
from one side to the other. Over here we have the x-sustain board. Common
terms for the x-sustain board is x-sus, x-main, z-sus, z-sustain and SS board. Common symptoms
that your TV is showing that could be the z-sustain is you will typically have a picture
of some kind on the screen, but it tends to look very red or purpley, the picture could
be very dark and flash a little bit, you could be getting slow-motion effects on the TV as
the panel isn't charging and discharging pixels correctly. So that can be some common problems
that could be your x-sustain. Next we are going to take a look at the logic
board. This board can also be referred to as the main logic control board, the control
board and the logic main. The logic board is connected to the main board and address
buffers, via flat-ribbon cables and can sometimes be hidden underneath the main board. One symptom
that could be a logic control, is if you have no picture on the screen, another would be
if your image has lines or defects in it, where you have solid colored vertical bars
going from top to bottom on the screen. Along the bottom here of the chassis on the
plasma TV are address buffers. In some older and larger plasma TVs you will also have address
buffers up here on the top of the TV. Some manufacturers will refer to the address buffers
as logic buffers as well and some companies will also give each buffer a different identification
letter, typically starting with the letter C.
A few symptoms that could be the address buffers, is if you have no picture on your screen or
if you have a blown fuse on a buffer. Thanks for watching our plasma TV video.
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