My parents philips 42pf7320/37 plasma tv has a bad picture. my boyfriend and i recently acquired it in the hopes we could fix it. the screen has many lines going across and up and down it. the color also bleeds. light colors tend to bleed up and down the screen. lastly the hue is very red around these abnormalities. we have looked and the power board and what we believe is the video board for bad solder joints. we haven't found anything that looks "wrong" yet. i was hoping someone here might be able to speed up our hit and miss process and send us in the right direction of what we should be looking at. if anyone has pictures of what we are looking at with labels pointing towards the different boards and parts (or even pics with a REALLY good discription of where things are located and what they are) that would be extremely helpful and much appreciated. thanks
I am having the same problem with my TV. I believe that the Y-Buffer Driver IC's are bad. There are two small boards on the left hand side(looking at the TV from the back) with 6 small heat sinks on each of them. If you look closely at the boards, it ill say Y-BUFFER on them. There are ribbon cables that run from them to the Plasma screen.
In my TV, several sections of the screen do not have lines in them. These driver IC's are not hot, however the sections of the screen that have lines in, the drivers are hot to the touch. In order to verify that the chips are indeed bad, I am going to swap one that I think is bad with a good section and see if the problem moves. If this is the case, the boards can be swapped out, or chips replaced depending on what kind of parts I am able to find. The chip that they use is SN755867. I haven't been able to locate a source for the chips yet.
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The most common cause for the loss of picture is a bad Horizontal Output Transistor
(HOT). but I would suggest you get a detailed
estimate. I think that this would cost you about $60.
The horizontal lines means the vertical amplifier or deflection system
has failed. There are over 100 components in this section and any one
of them, or most of them can be at fault. However, the most common
failure is the VOT or vertical output transistor (which is often buried
inside a chip).
The repair will cost around $150 plus or minus.
FEW TROUBLESHOOTING STEPS YOU CAN TRY:
ONE: Do a hard reset (just to make sure there is nothing in the coding
that is fowling things up). Unplug the power cord; leave it disconnected
for 4 hours. That will restore everything to factory defaults when you
power it back up.
TWO: Do the "whacking test" by banging your fist on a few strategic
places to see if there are any cold solder joints or loose wires acting
up inside the set.
If the above steps don't solve ur problem then I suggest you to go for a repair if you don't have any knowledge of repairing it.
A distorted picture display soon after the Plasma TV is powered on has two indications. First, a picture display of pixels when the TV is powered on is usual prior to signals of video movies are acquired from broadcasting station. The movie from braodcasting station should display without noticeable objects of distractions. For example, the movie displeyed on the TV without obstructions is indication that the problem is from the display set. Alternately, movies with poor capability to display on the set is indication that the media from which motion pictures are acquire from is malfucntioning. For example, a TV connected to cable network or disk network or satellite broadcasted signals with receptive compromises are diagnosable from two areas. First, a clarification from the network station that has setup connectivity of devices. Perhaps a device in the setup is malfucntioning. Second, attempting the adjust the phsical connections that are attached to the TV is capable of resoving the problem. Refer to the user guide for what is default expectation on powering on. Thereafter consul technical experts if required. Good luck
If the line is horizontal (it is a vertical problem) If its a Vertical line (it a horizontal problem) So it could be just a bad solder joint or a component has failed in the horizontal or vertical section. Hope this is helpful.