Hardware Trouble Shooting; Power Supply Trouble - Daewoo LX32L1 Series Service Manual

5. Hardware Trouble shooting

5-1) Power Supply Trouble

N N
Check power line or power supply
Check E1 for 5V and E2 for 3.3V output ?
Check if U2 for 3.3V and
U3 for 2.5V output?
N
Check the circuit
of U2 ,U3
N
U4/DC-DC IC damaged
Check if pin No.4 for U4/(DC-DC chip) is
false welding or U4 is damaged
-7-
Y Y
Put on the TV, Check for C10 ,C16,E5 E3 for 5V
output
N
Y
Check U4 for 1.2V Check U4 for 1.2V
output
Y
L2/10μH is damaged or
false welding
It 's normal but It's normal but
the voltage is
the voltage is
high
E6 is damaged or the E6 i d
loader is in short
Y
Check power board
for 5V output for 5V output
N Y
Check if the power
OK
on pin of power
board for 5V?
Low
d th
circuit