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Panasonic Plasma TH-42PZ77U Power Light Flashing 7x

Turned on the TV this morning it had sound for about two seconds, no picture then the power light started blinking 7x slowing then pausing then blinking 7x, etc... What could be the problem?

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  • rudyd Jun 30, 2008

    Bought panasonic plasma TH-42PZ77U on 12-15-07, tried to turn on the morning of 6-29-08. All that happened was a 7 blink sequence from the red power light, constantly repeating. No info at all in panasonic manual, figured it to be some kind of failure code with help from internet tech sites.



    Called Panasonic concierge service and they had me do one thing, which was to unplug the TV from the surge suppressor and plug it back into a receptacle by itself. APPARENTLY they don't do well when sharing a power source with other equipment. They told me it was most likely the power supply boards and nothing more could be done until a tech. came to check it out(under warranty).

    Is everyone in agreement here that this type of thing would be nice to tell the customer before set up and use.

  • Anonymous Jan 27, 2009

    same problem. red light blinks 7 times then.....nothing. Tv is 13 months old. :( Did not buy the extended warranty. For 1300 bucks you'd think a tv would last more than a year.

  • ethanmcdonal Jan 29, 2009

    I have the same problem just a little over 2 years.
    I come home and it won't power on, it gives me a red blinking 7 times.
    I'm not even done paying the F'n thing off from best buy.

    Does any one have any Diagnostic manuals for this set?

  • Anonymous Mar 15, 2009

    The TV powerlight goes into seven flashing mode. Then when it is unplugged, it keeps flashing for several seconds before it shuts off.

  • jmul Apr 12, 2009

    Same problem on a TH-50PX75U - TV is 13 months old as well. Very dissatisfied with Panasonic right now.

  • Gregory N. Brooks Feb 28, 2012

    I have a problem with a Panasonic TH-58PE75U Plasma TV. It blinks 10 times. The service manual says it is the A board. I thought possibly the power supply board until I found the manual. Anyone had any experience with this model and this specific blink code?

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1 Blink SOS: This shutdown operation is usually caused by a lack of communication between the A and the D boards.
1 Blink SOS: This shutdown operation may be caused by the improper connection of a SS board connector to the panel.
2 Blinks SOS: Pin 87 of the MPU IC9003 monitors the 15V line. During normal operation, the transistors Q9053 and Q9054 output a high to pin 87. If the 15V line is missing or shorted, a low is provided to pin 87. As a result, the unit shuts down and the power LED blinks 2 times.
3 Blinks SOS: IC9807 is a 3.3V regulator located on the D board. Its output is monitored by IC9003. If the 3.3V is not present at pin 86, the MPU shuts down the unit. The power LED blinks 3 times.
5 Blinks SOS: Pin 85 of the MPU IC9003 monitors the 5V line. During normal operation, the transistors Q9051 and Q9052 output a high to pin 85. If the 5V line is missing or shorted, a low is provided to pin 85. As a result, the unit shuts down and the power LED blinks 5 times.
6 Blinks SOS: Pin 90 of the MPU IC9003 monitors the status of the SC board. During normal operation, the transistor Q6581 and IC6581 output a low to pin 90. If the SC board becomes defective, a high is provided to pin 90. As a result, the unit shuts down and the power LED blinks 6
6 Blinks SOS: 6 blinks of the power LED may also be obtained from pin 3 of IC9003, the DRV_RESET input. The D board provides the 5V source needed to power the C boards. On the C2 board, the 5V is routed back to the D board via connector C20/C10, C11/D31 causing pin 3 of IC9003 to be high. If 5V is not routed back to the D board, pin 3 of IC9003 goes low. The set goes into shutdown mode and the power LED emits 6 blinks.
7 Blinks SOS: 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.
8 Blinks SOS: Pin 91 of the MPU IC9003 monitors the status of the SS board. During normal operation, pin 8 of connector SS23 outputs a low to pin 91. If the SS board becomes defective, a high is provided to pin 91. As a result, the unit shuts down and the power LED blinks 8 times.
10 Blinks SOS: The SUB5V and DT9V sources created on the A board are monitored by IC1100. If they are not present at pin 30 and 34, the MPU shuts down the unit. The power LED blinks 10 times.
10 Blinks SOS: The F_STB_15V of the P board, as well as the derived SUB5V and DT9V sources are monitored on the A board for excessive current. If a short circuit is developed in one of the supplied lines, pin 114 of IC1100 receives a high. The SUB5V and DT9V lines are also monitored for excessive voltage. When an over-voltage condition is detected, a high is also output to pin 114 of IC1100. The DT9V is provided to a DC/DC converter to create the BT30V for the tuner. If the BT30V becomes excessive, a high is output to pin 114 of IC1100. A high at pin 114 of IC1100 causes the unit to shutdown and the power LED to blink 10 times.

Posted on Oct 30, 2009

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I had the same issue. I called Panasonic and they sent someone to fix it for free even though it was purchased over 2 years ago and presumably out of warranty. The only thing they needed was proof of purchase. I was pleased with their service.

Posted on Jan 19, 2010

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I have a TH42PZ77U that had this problem. I called Panasonic and was as pleasant as possible and they were, as well. Come to find out Panasonic extended the 1 year warranty to 2 years due to this issue, and they sent someone out within 4 days and they fixed it at no charge. They reprogrammed the new board so that I shouldn't have the problem again. I love Panasonic!

Posted on Aug 25, 2009

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The power supply board seems to have died. If its under warranty, check with Panasonic. If not, whats your nearest electronics repair shop? Just make sure they dont charge you an arm and a leg.

Posted on Dec 31, 2007

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  • Master
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This is a major failure. This kind of thing is why you should always keep these TV's under warranty. Now you need to download the service manual, verify what the 7 blink code means and start replacing expensive boards. I believe on this unit one of the power voltages is wrong and you'll need the SC, SU, and SD boards.

Posted on Dec 31, 2007

  • waldo belles Dec 22, 2011

    Panasonic's self diagnostic system is virtually useless. I've had several of their plasma sets in the shop and did replace the recommended boards to no avail. I had one set owner call an authorized Panasonic service center in Seattle for advice. He was told he would be better off to buy a new set. Of course the tv was out of warranty.

    All other brands of plasma tv's are fairly easy to trouble shoot. I would say that Panasonic uses high quality component during manufacture. Does that make you feel better about Panasonic?

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