Changhong Electric PT4216, Service Manual, Page: 33 / 62

33
Part
Ⅳ
:Typical troubleshooting process flowchart of PT4216
one
、
red led does not light
red led does not light
yes no
Y
N
yes no
Check if 6th,7th pin
of jack J171 on main
board there is 3.3V power
supply
Check mainboard jack XP915
5 pin 5V power
Check
resistor RK2
、
light diode
VDK1
Check K board
iack XR900 11 pin
3.3V power
Check standby
circuit of power
board and power
jack AC 220V
input
1 、 Check whether FB927 on main
board is normal or not.
2
、 Check if U900 on main board
work normally or not
Check PCB
connect