Dead Part I - Panasonic TH-42PX75U Technical Manual

Troubleshooting (No Power/Dead Unit) Part 1
Is there 5V at
NO
pin 5 of connector A7 when the
TV is plugged into
the AC line?
Unplug the TV. Is there
NO
continuity between pins 8 and
10 of connector P12 of the P
board?
Check for missing jumper on CN SS34 on the
SS board. If jumper on connector SS34 is
present, replace the SS board.
Unplug the TV.
Disconnect connector A7.
NO
Does the TV turn on by itself
when it is plugged into the AC
line with no picture and lit
LEDs on SS & SC
boards?
Replace
The P board
NO
click after the TV is plugged
Yes
Yes
Yes
Replace
Go to the
The A board
Next slide
Do the AC relays
into the AC line?
NO
Does
NO
pin 5 of connector
A1 momentarily go from
4.5V to 0V when the
power button is
pressed?
Check connections
and the S & K boards.
NO
pin 11 of connector P25 when the power
Replace
The D board
Yes
Is there
2.5V at pin 20 of connector
D5 when the power button is
pressed?
Yes
Replace
The A board
Is there 3.2V at
button is pressed?
Yes
Yes
Replace
The P board