Question about Philips 42PF7320A 42 in. Plasma HDTV

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Horizontal and vertical lines

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

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Re: horizontal and vertical lines

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.

Posted on Jun 29, 2008

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Horizontal lines on Samsung Plasma


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.


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.


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1 Answer

Need help with my panasonic tc-50ps14

This is a plasma TV to which there are driver boards Top/Bottom, Left and Right.
Sounds like some of the driver main transistors have gone bad.
Wondering how old the TV is?
Honestly may be best to search for a new TV. Sorry to break this to you but its the law of supply and demand and there is such a glutton of TV's, Plasmas, LCD and LED tvs out there.
Sorry to be the bearer of bad news. As a tech I hate telling you this. I don't make the money fixing these older units. Cheaper to go out and by new with a warranty!

May 24, 2012 | Panasonic Flat Panel Televisions

1 Answer

The picture is distorted by both vertical and horizontal lines (different colors; pixelated)

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

Jan 08, 2011 | Philips 42PF9630A 42 in. Plasma Television

2 Answers

42" plasma tv problem

Hello, If you are referring to the actual shape of the prongs coming out of the tv plug(refer to figure): prs1-6980390t98.jpgif the prongs look like this, you will have to acquire an ac adaptor for your TV, this adaptor you can locate at any radioshack store, and sometimes it's called foreign ac adapters for US use.
or simply look at the radioshack webpage, it should be listed under ac adapters.

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You've got a bad panel. Hopefully Philips support will stand by their product & give you credit towards a new TV or replace your panel. There is no other way around this.

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