Haier 48E2500 - Power Board Diagnostics; Power Board Block Diagram; Power Board Service Flowchart

Service Manual
Model No.: 48E2500
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1.Power Board Diagram
AC
input
EMI
filter
Recti
fier
Power
convertor
Output
filter
12V_out
ON/ 0FF
ADJ/PWM
Feed
back
LED
LED CV
control circuit
PFC
circuit
Flyback
converter
Check EMI Common mode
inductance(LCB1,LCB3)
open or L to N short
Go to
check
Main
board
function
Check if FB 1 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
output normal
Check if EB202 voltage
about √2Vac
Check if UB101 PIN5
voltage is about 15V
Change damaged
components
Change short
components
Change damage
resistors
Change
UB101
2.Power Board Service Guide
N
Y
YY
Y
Y
Y
Y
N
N
N
N
N