Haier 32E2000, Service Manual

Page: 47 / 52

Service Manual
Model No.: 32E2000
- 46 -
10-2-1 AC/DC Power Board Diagram
10-2-2 AC/DC Power Supply Trouble
AC
input
EMI
filter
Rectifie
AC/DC
Power convertor
19V/24V/
32V/50V
output
Output
filter
Output
filter
19V/24V/
32V/50V
output
12V
output
Feed
back
power amplifier
、
The main IC
、
Screen voltage
and so on
LED driver
LED
BL_ON
PWM_REF
PWM_DIM
Check EMI open or L N short
Go to
check
Main
board
function
Check if FB1 Open
Check the power
components
damage or not
Check the rectifier
Check if output short
Check if RB101,
RB102 open
Non output, IR indicator light slake
Check if 12V
、
19V
（
24V/
32V/50V
）
output normal
Check if EB1 voltage
about
√
2Vac
Check if UB101 PIN5
voltage is about 15V
Change damaged
components
Change short
components
Change damage
resistors
Change
UB101
N
Y
Y Y
Y
Y
Y
Y
N
N
N
N
N