Panasonic TH-103PF9UK Technical Manual page 30

Panel SOS – Power LED Blinks 5 Times (2/6)
Trouble Mode Defective Board
P(Multi/SC),P(Multi/SS),D, DN,C1-CZ,
5.0V line SOS
SC, SS, DR1/2 Board, Panel(IC)
Power Supply / Protect Circuit
5 times
blink
Turn on the power SW.
Is there 5V
output at pin 7 of CN PC203
before shutdown ?
No
Turn on the power SW.
Is there 5V
output at pin 7 of CN PC202
before shutdown?
No
D (or PC)
Board
7 times 7 times
blink Diag.
Turn on the power SW.
Yes
Is there 5V
output at pin 7 of CN PC202
before shutdown?
P(SS) Board
Yes
P(SC)
Board
■D,P,DN,SC,SS Diag.
Disconnect CN D20 and C88.
Turn on the power SW.
Yes
(SC, SS NG)
Does the unit
power up?
No
(D or P or C, or Panel NG)
Disconnect CN D20, D31~D36.
Disconnect PC204 and PC205.
Turn on the power SW.
Yes
(C, or DR, or Panel NG)
Does the unit
power up?
No
Disconnect AC from the unit.
Disconnect CN D3 or CN DN2.
Yes
Is pin 30 of CN DN2
shorted to GND
No
30
How to find the defective board
Connect CN D20. Turn on
the power SW.
Does the unit
power up?
SS Board
Power SW
OFF
Yes
DN Board
No
D Board
No
SC Board
Yes
Perform C, DR, Panel
Diagnostic as shown on page 3/6.