PANASONIC TH-42PX75U - H-50PX75U - TH-42PX77U - TH-50PX77U - PLASMA TV - TROUBLEHOOT - LED BLINKS 1,2,3,4 &5 TIMES

SHUT-DOWN PROBLEMS

• Normally, when there is a power problem, shutdown occurs immediately.  So, to resolve a power problem, voltage checks are necessary before shutdown.

• Check if the power comes up after disconnecting the suspected board.  If power comes up  after disconnecting a board, the board is defective.   “Power comes up”equals “no shutdown”.

• After exchanging the following boards, voltage adjustment is required.  P board, SC board, SS board.

LED BLINKING TIMING [Click on table to Magnify]

TROUBLEHOOT FOR ONE TIME BLINK

• To confirm this, unplug the TV and disconnect connectors A5, A6, and A7 from the A board.

• The TV should turn on automatically and display a white screen.

Trouble Mode => Communication Error

Defective Board => A Board

To find the defective board:

The A board is defective.

LED BLINKS 2 TIMES
TH-50PX77U = SS33

Trouble Mode => 5V down SOS

Defective Board (Possibility) => P, D, A, SC, SS Board (P > A, D, SC, SS)

TH-42PX75U = SS23

TH-42PX77U = SS23

TH-50PX75U = SS33

LED BLINKS 3 TIMES
Defective Board => D Board

Trouble Mode => .3V down SOS

LED BLINKS 4 TIMES
YES > Panel.

Trouble Mode è Power Supply SOS

Defective Board è Primarily P board or possible D board

Turn the unit on.

Is pin 12 of CN P25 of the P board high before shutdown?

NO > D Board.

YES > P Board

LED BLINKS 5 TIMES

Trouble Mode => 5V SOS

Defective Board => D, P, C, SC, SS board or Panel (DDIC)*1

Disconnect CN P12 of the power supply board. Measure the resistance of pin 1 of the lead cable to ground.

Is there a short to ground?

NO > Proceed to more extensive troubleshooting.
Warning: Disconnect AC Power prior to  making any disconnection or connection.