Question about Panasonic TH-42PZ700U 42 in. Plasma Television

1 Answer

While watching the TV, the picture goes black and can stay that way for long periods of time with no warning or pattern. This is not a power issue, as the TV is still powered on I still have volume the whole time. The red light does not blink, it stays on. Everything works fine except for the picture blackout. I've had the TV almost two years now and had to deal with this problem for over 6 months off and on. It doesn't always happen but it does happen roughly 90% of the time while watching TV. Any ideas?

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  • wrightm328 Sep 27, 2009

    Thank you for providing a response. Are changing the boards as easy as swapping them out or should it be tested after installation? Do you recommend getting this done professionally? I will definatly check out all hdmi and a/v cords first just in case that would be an easy and cheap fix.

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  • Panasonic Master
  • 19,396 Answers

To start check all cables attached to TV , and test TV with no device or a minimal set of devices connected. A faulty connected device or a defective cable can cause the problem.
If plasma TV loose picture erratically, but tv keeps working, then the most common fault is concerning Sustain boards.
Sustain boards (Ysus Zsus) function is sustaining voltage on the plasma screen. If one of them is faulty, among other problems you can suddenly get darker picture or no picture.
You can replace Sus boards buying one of the kits , however part should be tested by a technician before repair. Less commonly but still possibly, the problem can also be caused by a faulty digital controller board or faulty buffer board inside the TV.
Here the parts:

YSUS SC BOARD TNPA4250 PANASONIC TH-42PZ700U

XSUS SS BOARD TNPA4251 PANASONIC TH-42PZ700U


Posted on Sep 26, 2009

  • Ginko
    Ginko Sep 27, 2009

    Changing the board is not a difficult repair. The job is done unplugging power cord, removing back panel , and removing and refitting the two sustain boards that are connected at the sides of the plasma panel.
    While doing the job parts can be damaged by touching the circuits or contact, and big capacitors can release dangerous discharge even when the TV is not connected to main.



    The issues are the following:


    For safety reason any repair job of this kind should be do by a technician. By law I cannot really suggest DIY to a non trained person.


    To test in full the Sus boards you need to work with volts on. This must definitively be avoided unless you have a strong experience repairing electronic and a H&S training.


    By replacing the part without testing you take the risk. The Ysus Xsus (Zsus on other TVs) is the most common cause for no screen, and TV working and not going on protect.
    Part for this set is quite expensive, and the problem can be caused by a fault on digital board or a bad connector.
    On other models the Ysus Xsus kit can be purchased for a lower price. In this case I think it will be better calling a technician. Call Mitsu first. You find the number on the manual (or tell me your location). Ask them a charge on repair or if there is possibility to get a new TV discounted. Ask also if you can extend your service plan to cover the repair.


    Many users fix their TV

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