LG 21FS2ALX, Service Manual

Page: 13 / 29

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CHECK B+
At D8 29 c a t ho d e
Is t he vo lt a g e a t
ea c h p in vo la g e o f IC1 1 Chec k
Fuse o f AC line
OK
Chec k t he
In/ o ut o f
reg ula t o r
( IC8 2 1 , IC8 2 2
IC8 2 3 , IC8 2 4
IC8 2 5 )
Chec k p in 6 0
Of IC1 1 ( H Out )
Chec k Q4 0 1
Co llec t o r wa vef o rm
Chec k Q4 0 2
Co llec t o r wa vef o rm
Chec k T4 0 1
& ea c h p in vo lt a g e
Chec k & Rep la c e
T4 0 2
Chec k t he Vo lt a g e
Of C8 0 3
Chec k t he Vo lt a g e
Pin 4 OF IC8 0 1
Chec k / Rep la c e
IC8 0 1 , IC8 0 2 , IC8 2 6
Chec k Fuse a nd Dio d e o f sec o nd a ry
Lo a d o f SMPS t ra ns( T8 0 3 )
Chec k / Rep la c e
IC1 1
Chec k &
Rep la c e
IC1 1
Chec k &
Rep la c e
Q4 0 2
Chec k &
Rep la c e
T4 0 1
Chec k &
Rep la c e
Q4 0 1
Chec k / Rep la c e
Fuse
Chec k / Rep la c e
DB8 0 1
Chec k / Rep la c e
Fuse IC8 0 1
NO
OK
OK
OK
NO
Op en
NO
18~20V
No rm al
Yes
Yes
Yes
Yes
NO
NO
NO
NO
Ab n o rm al
No Ras t er ( 2/ 2)
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