Power Supply - Haier 32E2000 Service Manual

10-2-3 LED driver Trouble
Correct
the LED
cable
10-2-4 DC/DC Power Supply Trouble
IR indicator light
up but backlight slake
Y
Check if LED output cable
is connect correction
Check PWM_DIM&PWM_REF&
BL_ON Control signal
Check if LED
check is part of
Y
output
the brightness is
short/open
in dim status
Y
Remove
short/open
status
Check Pin2 of CNB2 for 12V
N
Check if the power
board is OK?
N
Repair the power board.
Repair the abnormal circuit :
1.5V_STB—check U2
2. 3V3_STB—check UL1
3.1.15V_STB–- check UD1
and peripheral components
Repair the abnormal circuit :
1. 5V_M—check power supply ,and
QM32 circuit
2. 1V8_DDR–- check UL2
N
N
Y
Increase
Y
check is all of
brightness/check
the brightness is
if Sampling
in dim status
resistor is right
N
Check if UB801/UB802
PIN1 voltage is about 12V
Y
N
Check QB801/DB801
damage or not
Y
Change Change
UB801/UB802
QB801/DB801
Y
Check power on the TV board.
Y
Check U2 for 5V_STB , UL1 for
3V3_STB and UD1 for 1.15V_STB
Y
N
Power on , check CM32 for
5V_M,UL2 for 1.8V_DDR
N
Y
OK
- 47 -
Service Manual
Model No.: 32E2000
Check
Main
board
function