Panasonic TC-P42X1 Revised Troubleshooting Handbook page 55

8 Blinks Error Code (Full-HD Models) Flowchart
If the power LED continues to blink even after the TV is unplugged, press and hold the power
switch on the TV for a few seconds until the LED turns off.
Verify that all the flex-cables between the panel and the SS/SS2 boards are properly seated and the connectors are
properly locked. Unplug the TV and disconnect connector SS33 from the SS board. Plug in the TV and turn it on
At this point there are 2 possibilities, The SS board and the
panel. The SS board is by far the number 1 suspect.
To determine which of the 2 is causing the problem:
Disconnect the TV. Use a volt-meter and place the positive
probe on the anode of D280 on the SS board (See previous
slide for location), while the negative probe is grounded. Plug
in the TV and turn it on
Is there
Yes
approx. 4V at
the anode of
D280 on the
SS board?
Replace
the panel
Start Here
Does the
Yes
TV power
up and
stay on?
Unplug the TV and reconnect SS33. Remove the
ribbon cables from connector A31, A32, and A33
on the A board. Plug in the TV and turn it on
No
Yes
Replace Replace
the SS board
the A board
No
No
number of
change to 6
or 7 blinks?
8 Blinks
Does the TV
power up and
No
stay on with the
SC and SS LED
on?
the P board
Did the
Yes
blinks
Replace Replace
the A board
Slide #55