Telefunken TF-LED15S27, Руководство по обслуживанию

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In stand-by condition
，
Check Test point TP5 have
12V
？
Check TP3 have 5V,TP4 have 1.26V and TP2 have 3.3V ?
Normal boot
Figure.1 Power Units Problem Solving
Y
N
OK
Check U5/U7/U4 power
supply net
N
Y
N
Y
Check external power
After power on
，
Check Test point
TP6 have 5V
，
Test point TP7 have
3.3V
，
Test Point TP1 have 2.5V/1.8V
（
TSUMV29LU is 2.5V,TSUMV59XU is
1.8V
）
(Q8
、
Q9) Burnout
、
or load short-circuit .
Check power chip LDO (U2) work
？