Teac LEDV2282FHD, Руководство по обслуживанию

Страница: 10 / 46

Picture Picture
1 1
Power Units Problem Solving Power Units Problem Solving
In stand-by mode, Check TP1 have 12V?
Check the +5V and +3.3V test-point of main
board whether the voltage is correct or not
Power on the
machine
Check LDO IC U1; U4
、
U10
、
U3
、
Q1
、
Q2 burned or over
load short-circuit
test-point TP3 have 5V?
test-point TP2 have 12V?
test-point TP11 have
1.8V?
，
test-point TP9
have 3.3V? test-point TP12
have 2.5V
，
test-point TP6
have 1.32V
？
Y N
O K
Check the power
network of U1,U21
N
Y
N
Y
Check their
external circuit