Hyundai HQL320WR Service Manual page 11

Hyundai ImageQuest LCD TV HQL260WR/320WR
NO SOUND
YES
CHECK
U25 PIN 16
HP/SW
VOLTAGE
(3.3V)?
YES
CHECK
NO
MUTE
YES
CHECK
NO
U7 PIN 27/28
OUT_L/R?
YES
CHECK
NO
U3 PIN 7
VCC 12V?
YES
CHECK
NO
SPK1 PIN 1/3
SOUND OUT?
YES
CHANGE SPEAKER
YES
NO SOUND
NO
CHECK
U3 PIN 8
NO
VOLTAGE
(12V)
TROUBLE IN
U7
TROUBLE IN
U3
CHECK
FB1,
FB2,C22,C53
--10--
TROUBLE IN
AV CONN.
BOARD
TROUBLE IN
L7
CHECK
R13,R18,R19,Q5