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Repair guides and support for Panasonic's Viera line of televisions.

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My TV does not power on and is exhibiting blinking red led 7 times

Hello. I have a Panasonic TC-P55VT30 plasma TV. When I attempt to power it on, I hear a click that it is trying to power up however nothing is visible on the display and the red led is blinking a series of 7 times. Please help

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@jama223 teh 7 blink code for your Plasma is 7 detecting errors on

Driver SOS2

(SU/SD Connector DET)

(SU/SD Scan and Logic IC)

During it's Power On Self Test (POST)

The boards that cause this are the SU-Board or(and) the SD-Board

Download the SM for your TV from here to get to and replace those.

The SC board has 2 SOS detect circuits, energy recovery and floating ground section.

When the energy recovery circuit is triggered, the TV shuts down and the power LED blinks 6 times.

The floating ground circuit monitors the scan circuit output, the 15V_F, the scan_pro, Vscan, and the physical connection between the SC board and the SU/SD board (CHA).

If any abnormality occurs on any of these lines or Vsus is missing, the TV shuts down and the power LED blinks 7 times. If any of the connectors between the SC and the SU/SD board is open, the TV also shuts down and the power LED blinks 7 times.

TRy to isolate those boards and see what you get

Unplugging any of the connectors SC41/SU41, SU11/SD11, and

SC42/SD42, opens the interlocked connection between VF_GND and CHA on the SC board. This floats point “CHA” and Q16471 turns on. IC16561 outputs a high to pin 21 of connector SC20 triggering shutdown.

To isolate the SU and SD boards at the same time is not necessary to remove the boards:

  • Remove the 4 VF_GND screws (2 on the SU board and 2 on the SD board).
  • Unplug connectors SC41, SC46, and SC42 on the SC board.
  • Place a jumper between pins 1 and 2 of the empty connector SC50.

When this is done, the display is completely black (No picture)

Or isolate teh individual SU and SD board so you know which one is the most likely candidate

To isolate the SU board:

  • Remove the 2 VF_GND screws on the SU board only.
  • Unplug connector SC41 on the SC board and SU11 on SU board.
  • Place a jumper between pins 1 and 2 of the empty connector SC50.

Note: This procedure could be useful when troubleshooting 7 blinks problems.

Unplugging SC41/SU41, SU11/SD11, and SC42/SD42, opens the interlocked connection between VF_GND and CHA on the SC board. This floats point “CHA” and a high is output to connector SC20 triggering shutdown.

To isolate the SD board:

  • Remove the 2 VF_GND screws on the SD board only.
  • Unplug connector SC46 and SC42 on the SC board and SU11 on SU board.
  • Place a jumper between pins 1 and 2 of the empty connector SC50.

Let us know what you find out. As always, be careful not to touch the boards wildly. The caps on those, mainly on the power board, will be charged and could lead to some very painful shocking experiences.

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