LG RT-21FD90VQ Service Manual page 14

OK
Chec k IC11 p in71, 7 2, 73
( R, G, B o ut )
NO
Chec k p in40( V o ut 1)
1 Vp - p
NO
Q501 , Q5 03, Q50 4
( R, G, B o ut o f IC11)
NO Pic t ure No So und
/
NO
. ,
Chec k 1 8V 3. 3 V
5 V DC Vo ltag e
Chec k p in18
Reset Vo lta g e
.
3 3 V DC OK
Chec k p in57, 58
SCL, SDA
3 3 V DC . OK
Relac e IC11
- 14 -
Is Any OSD d isp la yed ?
OK OK
Chec k rec eiving syst em in MENU
-
& exec ut e Aut o Pro g ram .
Do es t he auto Pro g ra m
Op erat e p ro p erly
OK
Sto re o n m anual - p ro g ram MENU
NO
,
Chec k SMPS Trans
Sec o nd ary Vo ltag e
NO
Chec k IC13
( Reset IC)
NO
Chec k IC12 ( EEPROM)
& SCL SDA Line
,
Chec k / Rep la c e
CPT Bo ard c o m p o nent
OK
-
Go t o
No So und
Pic t ure OK
/