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Panasonic plasma TV model TH-42PZ77U. No picture or sound. Power indicator blinks red. What's up?

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  • mwcharbo Dec 21, 2008

    The power indicator (LED) flashes a series of 7 short red blinks. One person responded that I should start checking the circuit boards with my multimeter. I need help on a more pedestrian level.

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Hi and welcome to FixYa,

Initially, a known common issue with this TV series, with a variety of faults following Murphy's Law. Another hitch is most of the parts are not readily available and are back ordered. Sorry to be bringing you the bad news.

This of course would require opening the unit, perform voltage measurements,determine faulty component and subsequent part(s) replacement. Further, a fair familiarity of electronic components/circuitry and safety procedures, use of a DVM and a soldering iron would be required. It would be to your added advantage access to a service manual or at the very least a schematic diagram with voltage readings.Should you be uncomfortable performing a DIY (do-it-yourself), perhaps your best bet would then be to seek the services of a qualified professional or consider other options.

Good luck and Thank you for using FixYa. Happy Holidays.

Posted on Dec 21, 2008

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7 blinks = scan error

panasonic says:

How to diagnose power LED blinks 7 times symptom.
Possible
Causes:
1. Conduction between the sustain and scan electrodes causes the output ICs to fail on either the
SD or SU board, depending on the location of the damaged pixels. -OR-
2. FET transistors on the SC board fail, preventing the delivery of scan pulses to the panel.

the way it works, the sc (scan) board drives the screen through the su (scan upper) and sd (scan lower) boards. usually it can be any of the three-

If you dont have a multimeter, then you can check it physically.
-remove back panel.
-the 3 boards are on the left side when viewed from the back.
the sc is the big one, and the su and sd will be hooked to the screen with ribbon cables.
-inspect the "snot" ics (chips) on the su and sd boards.
-be very careful! ribbon cables are fragile and break easily. - check all the black chips on the two boards, you may have to flip them over by removing screws (can't remember) .. look at the chips.. even a small pin ***** can be a interal burn up.. check all of them for burn holes or spots.

-if su and sd boards are ok, just replace the sc board.
-if su or sd are burnt up, replace the appropriate board and the sc board.

let me know specifics, i can talk you through it.

Posted on Dec 21, 2008

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Pin 93 of the MPU IC9003 monitors the status of the SC, SU, SD board. During normal operation, the photo-coupler PC6480 outputs a low to pin 93. If the SC, SU, or SD board becomes defective, a high is provided to pin 93. As a result, the unit shuts down and the power LED blinks 7 times.
Panasonic plasma TV model TH-42PZ77U. - 2b7d2be.jpg

Posted on Dec 21, 2008

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First make sure all the cable at the back of the TV is connected properly.

The problem you referred means that the TV is going in protect mode because it detects an internal problem, try leaving it unplugged for a longer time, let say one hour or two.
Basically, what happens is that the TV does not start because it detects that there is an internal problem, such as a wrong voltage, a bad component, overheating etc.
When you unplug power and restart it, you reset the internal circuit, and the TV will restart, not detecting the internal problem.
As soon as the TV gets hot, after staying on for a while, the defective part start giving troubles, as the defective component (probably an IC, starts overheating).

From description, the Digital Processing Board can be cause for the problem as there is no video.
However all the following parts can be involved.

Parts involved can be

Digital Processing Board
LCD Controller

Contact some local tech shop or geeksquad to get the unit repaired.

Thanks

Posted on Dec 21, 2008

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Confirm problem for sure in the internal circuit board.it needs to be checked with a multimeter to locate the faulty component on the board.replace it with new component.u can get this components at radioshack or at local tv electronics shop.it could be faulty capacitor or ICs.check it out. thanks.

Posted on Dec 21, 2008

  • tech gurus Dec 21, 2008

     Six blinks---- No horizontal (H STOP), no raster, goes to the blinking
    self-diagnosis function immediately. Check C515 and 516 and the jungle IC,
    IC206. Seven blinks---- High voltage shutdown. The high voltage has exceeded 33k
    and the unit goes immediately into safety shutdown. Check power supply
    regulation and horizontal circuits. Eight blinks---- Problem with the audio
    (AUDIO), unit goes to standby and blinks the self-diagnosis code. Check IC406
    audio amp, PS401 an


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