Panasonic Viera TH-42PX80U Plasma TV - Page 8 - Answered Questions & Fixed issues

I just got a new panasonic Viera 42" plasma and when its on the picture sharpness is not that good and looks grey is this right

Should be a button on the bottom left of the remote labeled R-TUNE. That will send you to the last previously viewed channel.

More likely to have power supply module failure, that will be the first place to look.
Most common failures in PLASMA TV are due to bad power supply module, Z and Y Sustain modules.

I would consult your user/installation manual.

If you were to log on to the manufacturer's web site, I think you will be pleasantly surprised as usually one is able to download, by model number, Customer Instruction Manuals, list of Dealers for spare part supplies as required.

Just Google the manufacturer's name and follow the links. Make certain you are directed to the manufacturer's web site as some search engines direct you to other sites and they charge for the information that is normally free of charge.

I hope this helps.

POSSIBLE LOGIC/CONTROL BOARD FAILURE OTHERWISE DEFECTIVE PLASMA PANEL

I had a similar problem with my 42 in Philips LCD HDTV.

Here was the problem. My Power Supply Board had several bad capacitors. I opened my TV (warranty was expired of course) and found four bulged capacitors on the PSB. Many major electronics companies Philips/Magnavox, Sony, Panasonic, and others were sold capacitors that failed in 2-5 years instead of 10-20. The capacitors fail prematurely due to a lack of preservatives. Unfortunately, they were installed in all sorts of devices and cause a wide range of failure problems.

Here are some options for you.

1. Have it fixed by a professional $$$$$$$??????? (Is it under warranty?)

2. Open your TV and find PSB. (The board that the power cord plugs into) Check for faulty caps. If you find some (bulged or leaking) bad caps replace the entire board. The entire board costs around $250 right now because they are in high demand right now. They can be found at tv-part.com but supplies are limited. I would definitely shop around though.

3. Remove and then replace individual faulty caps. This takes some soldering skill.

Caps are inexpensive and if you can take care of it yourself it will save you hundreds.

This may be your problem. If you determine that it might be.

I have a Tip/How TO tutorial on this site that may also help. It gives step by step instructions for replacing caps on PSB #715t2432-2. If this is your board you are in luck. Here is the Link: Fixing the Philips Turns/shuts off on its own problem. I'm working on uploading pictures to help guide people though the process as well. Let me know if I can do anything to help.

Hope this helps and if it does please rate it accordingly. Good luck.

Hello,

Your power supply board is dead, u know basic electronics' and soldering? Most of the times, the power supply board just have dead leakages gases capacitors.These capacitors always bulges up on it top,or puff up on it top.Replaced these gases leakages capacitors will get your TV power stable,and work again.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.


Take care in solving the problem....

Tries tv unplug,replug it back like about an hour later.Now the tv is resetting itself back to the factory setting.The tv should work now.If still have the same problems,than it is the power supply board is the causes and the problems.Try Ebay.com to buy a whole refurbish power supply board for the replacement.That the board,where the power a/c cord plug into it.

Hi,

The issue you describe is consistent with a power supply board issue. This is the board where the AC goes to.

I do not think it needs replacement, rather some defective capacitors are causing this issue.
Open unit up and take a look at the power supply board.You will probably see one or more electrolytic filter capacitors that are bulged up in the top-not perfectly flat like the others.

The value of these capacitors will be different, most likely they will be somewhere around-820 to 2200uF/25 V( or /10V sometimes)

You can replace them with same values but I would recommend the voltage rating to be higher(like 35V for an original 25V) for reliability purposes.

What happens is,these bulged top capacitors will cause a low and unfiltered DC voltage=main board will malfunction(the relay will keep clicking until the caps are holding enough charge to bring the voltage up over a threshold point).

You can buy these capacitors at any Fry's or Radioshack store or you can order them online at vendors like "mcmelectronics.com"(look for electrolytic capacitors).
After replacing these capacitor(capacitors) most likely the normal operation will be restored.

Note: There may be also some other causes for this symptom ,like a defective T con board ,or main board,but the bulged top capacitors are the most common cause for this issue.

I hope this helps.

Good luck.

it'll not be there when tv off because dead pixels do only show when back light of screen comes on, anyway if you still have a warranty then ask for them to check it out as it sounds like you need a new screen there mate

We had this problem. Very common to Panasonic. The problem is your A board. Panasonic is cheap because they spec'd a board that was possiblly defective. As long as you purchased within 1 year, you should be covered by manufacturer's warranty and Panasonic will send someone to your home to repair. Otherwise, if you don't have extended warranty you will have to pay.

Cheaper to buy a new set.

Look for a fried (possibly exploded) transistor or diode on the power supply board. In particular, look at the transistor mounted on a heat sink (metal radiator block) between the fuse and the largest transformer on the board. It may also have a damaged regulator chip driving it. Modern TV sets operated by remote controls generally have the power supply split into two sections - standby and main. Your problem is most likely in the main section.

A voltage sniffer won't tell you much - most sets have power right up to the fuse on the power supply board. If the fuse is blown, don't bother replacing it until you find out what blew it - you'll just waste another fuse. I generally start by doing ohmmeter checks (power disconnected!) on the diodes and transistors - anything reading less than 1 Ohm is probably fried or is being shorted through a transformer winding by another fried component. Other readings must be interpreted according to the circuit design.

Tv power supply board is the problems and the causes.That the board,where the power a/c cord plug into it.Try website like Ebay.com to buy a whole refurbish power supply board for the replacement.

There seems to be a problem with the RGB amplifier on the DG board of the set. Replacing that should resolve the issue but its gonna need pretty good electronics and soldering skills as the pins of the IC have to be de-soldered from the board and the new IC has to be soldered in. Would you like to do it yourself?

Hello; First you need to know if the scratched part is plastic or glass. I believe my Panasonic Viera plasma has a glass outer screen. I would start looking at kits to repair scratched eyeglasses or car windsheilds. There are also kits for plastics for either of these. Check with auto parts stores or EBAY Good luck! John

try panisonic and ebay

Hi,

Unplug the TV for few minutes, say 15 minutes and then turn it ON. If it still shows the same problem, this is an internal failure and needs repair. Kindly provide few more details to diagnose the problem :-

1. Is this an issue even if you play Blur Ray or DVD player?
2. How old is the unit?
3. Kindly provide the blinking sequence like 3 blinks then pause and then 3 blinks or no sequence at all?

Let me know,so that we could proceed.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Hello,

All plasma TVs have boards that control vertical and horizontal output to their respective areas. They are connected to the screen by ribbon cables. If one of these boards fails all together, has a failed chip, a bad connection, or a bad ground somewhere it will result in a black line in the area of that board. A bad ribbon cable connection on the bottom will result in a vertical black bar though the screen. Many times resetting the connection will fix it, if the ribbon cable has been nicked there could be a severed connection. They an sometimes be fixed, but it is a pain. An yes I have done it, but the bar is gone. The same will happen if the chip that outputs to that area opens. The connectors are the first place to look paying close attention to the cable, they are extremely delicate so great care must be taken if you decide to tinker with em, the usually have lift locks that release them.


I hope this will help out in solving the problem ......

Which begs the question how many times does it blink in between each pause? It is a diagnostic error code that will help us zero in on the problem.