Haier 32E2000 Service Manual page 47

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