LG RT-21FB80VQ, Service Manual, Page: 14 / 29

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NO Pic t ure No So un d
Is Any OSD d isp la yed ?
Chec k IC1 1 p in7 1 , 7 2 , 7 3
( R, G, B o ut )
OK
St o re o n m a nua l - p ro g ra m MENU
Do es t he a ut o Pro g ra m
Op era t e p ro p erly
Chec k p in4 0 ( V o ut 1 )
1 Vp- p Chec k 1 8 V 3 . 3 V
5 V DC Vo lt a g e Chec k SMPS Tra ns
Sec o nd a ry Vo lt a g e
Chec k p in1 8
Reset Vo lt a g e Chec k IC1 3
( Reset IC)
Chec k p in5 7 , 5 8
SCL, SDA Chec k IC1 2 ( EEPROM)
& SCL SDA Line
Rela c e IC1 1
Q5 0 1 , Q5 0 3 , Q5 0 4
( R, G, B o ut o f IC1 1 ) Chec k / Rep la c e
CPT Bo a rd c o m p o nent
Go t o
No So und
Pic t ure OK
OK
OK
OK
OK
NO
NO
NO NO
NO
NO
3 3 V DC
OK
OK
3 3 V DC
Chec k rec eiving syst em in MENU
& exec ut e Aut o Pro g ra m .
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