LG RT-21FB55M - No Raster Troubleshooting

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CHECK B+
At D829 c atho d e
Is the vo lt ag e at
eac h p in volage of IC11
Chec k
Fuse of AC line
OK
Chec k t he
In/ o ut of
reg ulat o r
(IC821, IC822
IC823, IC824
IC825)
Chec k p in 60
Of IC11( H Out)
Chec k Q401
Collec to r wavef orm
Chec k Q402
Collec to r wavef orm
Chec k T401
& eac h pin vo ltage
Chec k & Rep lac e
T402
Chec k t he Vo lta g e
Of C803
Chec k t he Vo lta g e
Pin 4 OF IC801
Chec k / Rep lac e
IC801, IC8 02, IC826
Chec k Fuse and Dio de of sec ond ary
Lo ad o f SMPS t rans(T803)
Chec k / Replac e
IC11
Chec k &
Rep lac e
IC11
Chec k &
Rep lac e
Q40 2
Chec k &
Rep lac e
T40 1
Chec k &
Rep lac e
Q40 1
Chec k / Rep lac e
Fuse
Chec k / Rep lac e
DB801
Chec k / Rep lac e
Fuse IC801
NO
OK
OK
OK
NO
Op en
NO
18~20V
No rmal
Yes
Yes
Yes
Yes
NO
NO
NO
NO
Ab no rmal
No Ras ter (2/ 2)
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