Question about Panasonic Viera TH-42PZ85U 42 in. Plasma TV

1 Answer

The TV does not turn on at all. When plugged in, 2 relays on the power board click, then the front LED blinks 10 times. The service manual says this is an S.O.S. for 3.3V or 5V or 9V on signal board, but I think the problem is with the 15V supply on P board (from which the 3.3V, 5V and 9V are derived) since the 15V supply does not measure any voltage at all at any time... It is a very widespread problem and I would like to repair it. I want advice regarding component level repair for my TV. I am not interested in replies such as "buy a new power supply". I know I can just replace the P board (power board) but I want to repair it. I look forward to your reply...

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  • Unspun01 Sep 14, 2011

    Fixed the problem myself. I replaced the MC201 and MC301 modules. This restored the functionality to the TV without having to spend additional money on a replacement power supply. You can obtain the modules from www.partstore.com.

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  • Panasonic Master
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Want to do the repair on the PS? Then get out your unsoldering tool and unsolder all the suspected parts, caps, diodes, resistors, relays, etc., making notes of where they came from and noting polarities. Then whip out your test gear and start working. Replace any and all defective parts as you come to them. If you have any IC's on the board you are sh-- out of luck - you replace if you are successful at getting the old one out. Still wanna repair? Good luck to you.
Psst - you send it out for repair and the dude is gonna replace the board - trust me.

Posted on Mar 31, 2017

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

  • 1894 Answers

SOURCE: No audio or video but LED blinks 5 times

does the unit start or what?

does the unit start fully and shut off??

BTW what was the blinks pattern??

Posted on Jul 01, 2008

  • 1 Answer

SOURCE: Panasonic TH-50PE700U red light flashing 6 times

Replaced the sc board and tv works fine again.

Posted on Jan 22, 2009

  • 1 Answer

SOURCE: TH-42PX60U wont turn on. Blinks 10 times.

What I'm learning is there are several models of Panasonic TV's that have a video card that doesn't play well with HDMI applications and the end result is, you need to call this number and not only make arrangements to replace the bad board,but also this!
Your model doesn't show below,but I'd certinly inquire about the necessity of a "Firmware" update!,,,Panasonic knows FULL WELL they have a HUGE problem here!
Hope this helps!

At panasonic.ca I found the listing for the fw update under customer support-important notices

If you own a plasma TV with model and serial number within the range specified below, please contact our toll-free VIERA Concierge hotline service at 1-866-330-0014. A VIERA product expert will arrange an in-home software update for your TV at your convenience.



Model Numbers Serial Number Range

TH-42PZ77U

TH-42PZ700U **71250001 ~ **80189999

TH-42PZ700UA

Posted on Jan 29, 2010

  • 8457 Answers

SOURCE: plasma 50 inches dont turn on

The power supply board is dead.Tries the websites like Shopjimmy.com,Ebay.com to buy the refurbish power supply board for the replacement.

Posted on Jun 22, 2010

toolkits
  • 1099 Answers

SOURCE: I have a Panasonic TH-42PX80U TV. When I power up

Hi
A common problem for these is bad capacitors in the power supply, Remove the back from your Tv and look at the power supply on the left hand side.

You will see roughly around 9 x capacitors that are bulged / domed shaped on top usually these are valued at 3300uf 10V any that have bulged or leaked a brown like substance should be changed.
This will cure the problem as they overheat being sat next to a heatsink that gets very hot!
Try and change them for the same 3300uf but a higher voltage.
Hope this helps

Posted on Oct 04, 2010

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These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
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Hi bschaub796,
10 times blinking of your unit indicated that the processor sense the missing 15v from the power supply. This problem is quite technical since I've already read your post that you have a reading of 15v in P25.
Now, we have to examined it deeply to determine where the fault came from between the two board.
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Hope I helped you.
Have a nice day!
Thanks for using Fixya.

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