Haier HL19KN1, Service Manual, Page: 41 / 56

Check E43
/470
μ
F/16V
for 5V
Check U15 Pin 3 for 12V pulse
Check U22
（
AIC1084-
33PM
）
for
3.3V output
Check U15 Pin
NO.2 for 12V
input，Pin
NO.7 for 3.3V
Check U34
for 1.2V
output
L16 open
or
damaged
Check U32
（
AZ1117H
-1.8
）
for
1.8V output
Check
U22
output
is
in
short
circuit
Check the
circuit
before
U22
Check U32
for 5V
input
Check U22
for 5V
input
Check U34
for 3.3V
input
Check
U32 and
change
it
1 U22 is damaged and
change is。
2 Check the back
circuit
U22 is
damaged
and
change it
Y
N
Y
N
NO 12V
Y
N
2
、
Power supply trouble (DVB
Power supply trouble (DVB
-
-
T)
T)
Y
Check U6/MCU Pin NO.
5 for 3.3V output
Or change U6/MCU
Check The PCB board isn`t
open or
in short circuit from
F1 to U15 Pin 2
NO 3.3V
N
Y
N
Check
U34
isn`t in
short
circuit
N
Y
U34 is damaged and
change it
Y
N
1 U34 is damaged and
change is
。
2 Check the back circuit
N
Y
Check
U32
Front
Circuit for
power
supply
N