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Hello, I have a Panasonic TH-50PZ800U Plasma. Recently I tried to power it on and got the blinking red light. I unplugged it, waited, plugged it back in and then it would turn on. This worked twice and now I just get the blinking light after some internal clicking noises. The light blinks twice, pauses and repeats. I initially assumed it was a power supply issue but then read on a couple of forums that the 2-blink code was a bad 15v SOS D Board. I bought a new D-Board from topjimmy.com Part #:TNPA4439BJS - http://www.shopjimmy.com/panasonic-tnpa4439bjs-d-board.htm And a new Sub Power Supply, also from topjimmy.com Part #: ETX2MM704MGB - http://www.shopjimmy.com/panasonic-etx2mm704mgb-sub-power-supply.htm After verifying that the parts and numbers were identical, I began by installing the Sub Power Supply. Same symptom and error after installation. I then installed the new D-Board and again got the exact same problem and 2-blink code. Did I change out the wrong part? Any help would be greatly appreciated. Thanks

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  • Richard Zessin Sep 04, 2012

    Do you still have one of the d boards, we may be interested in buying it form you. Richard 0411721413

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Hi Aaron,
2 blinks error code is definitely a 15VDC SOS detect, but this error code does not means that the fault was came from the D board alone. Remember that this is a supply voltage issue also. In the service manual, stated there that the test point is in the D-board (not specifically replaced the D-board).
Let me know the reading in the connector (P25) pin #1&2 in the D-board to assist you further.
Also just for the confirmation of 5vdc, let me know also the reading in (P25) pin #5&6 in the D-board.
Note : to have an accurate reading, place the test prod of your multimeter on the test point prior from powering on the unit because the supply voltage will cut-off after the self test.
Jdvillanueva

Posted on May 24, 2011

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