akira LCT-20CHST, Service Manual

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31
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Model No.: LCT-20CHST
Version: 1.0
d. Picture abnormal, color abnormal, short of color
Observe the picture is different in one
condition by the mode of switch signal
source
Check U20 and i t ’ s
out si de ci r cui t , check
t he Q12
、
Q14
、
Q15 i s
nor mal or not
Check U6 and i t ’ s
out si de ci r cui t i s
nor mal or not
Check the jointing of screen
socket J16
、
J17
、
J22 in
main board is OK or not,the
connection is OK or not
TV 、 AV condition picture
different
HD 、 VGAcondition picture
different
all appear picture different
normal
Check the output of 85th
、
86th
、
87th pin of U2
Check FB1 、 FB2 、 FB3 、
FB4
、
FB5 inductance are
normal or not
Check U2 outside
circuit is normal or
not,change fault ones
normal
normal