TCL L42V6200-LA Series, Service Manual

Page: 34 / 61

DC-DC CONVERTER CIRCUIT 2
CHECK if the DVDD 3V3
OUTPUT at U104 PIN2
CHECK if the 5V
INPUT at U104
PIN3
&LVVKRUWFLUFXLW
)$,/85(32,17
/LVRSHQFLUFXLW
5&&LVVKRUWFLUFXLW
,&8
2WKHU'9''9QHW
)$,/85(32,17
CHECK if the
DDRV(1V5) OUTPUT
at U111 PIN2
CHECK if the 5V
INPUT at U111 PIN3
55LVRSHQFLUFXLW
&&LVVKRUWFLUFXLW
)$,/85(32,17
&&LVVKRUWFLUFXLW
,&8
2WKHU''59QHW
)$,/85(32,17
N N
N N
Y
Y
CHECK if the
AVDD3V3 OUTPUT
at U109 PIN2,4
CHECK if the 5V
INPUT at U109 PIN3
&LVVKRUWFLUFXLW
)$,/85(32,17
N N
Y
&&LVVKRUWFLUFXLW
,&8
2WKHU$9''9QHW
)$,/85(32,17
1.CHECK if the 24V
INPUT at U106
PIN1+Q100 PIN 5?
//LVRSHQFLUFXLW
&&LVVKRUWFLUFXLW
SRZHUERDUGIDLOXUH
)$,/85(32,17
///LVRSHQFLUFXLW
&&LVVKRUWFLUFXLW
,&8
2WKHU9QHW
)$,/85(32,17
Y
N
Y
N CHECK if the 5V OUTPUT
from U106+Q100 OUT,L102
CHECK if the
AVDD1V2 OUTPUT
at U105 PIN2,4
CHECK if the 3.3V
INPUT at U105 PIN3
55LVRSHQFLUFXLW
&LVVKRUWFLUFXLW
)$,/85(32,17
N N
Y
5&&LVVKRUWFLUFXLW
,&8
2WKHU$9''9QHW
)$,/85(32,17
Y