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one、red led do not light
Check K board
yes
iack XK01 11 pin
5V power
Check
Y
resistance RK2、
LBD VDK1
N
Check
circuit
connect
PartⅣ:Typical Defectives and Repair of PT4206
red led do not light
no
Check jack XP901 2 pin
5V power supply
1、Check XP801 2 pin short circuit
to ground whether or not
2、Check mainboard L801
3、 Check PW113 reset circuit、 clock
circuit
Check mainboard jack XP801
2 pin 5V power
yes
no
Check power filter
and power jack
AC 220V input
43
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