Troubleshooting Guide - Hyundai HQL320WR Service Manual

Hyundai ImageQuest LCD TV HQL260WR/320WR
Trouble Shooting Guide
. No Power
1
CHECK
U28 PIN8
VOLTAGE
(15V)?
CHECK
TROUBL E
U26 PIN3
VOLTAGE
(9V)?
CHECK
NO
U9 PIN8,6 TROUBLE
VOLTAGE IN U9
(15V)?
YES
CHECK END
NO POWER
CHECK
U15 PIN6
VOLTAGE
NO
(5V)?
TROUBLE
IN U28, U15
CHECK
U20 PIN2
IN U26
VOLTAGE
NO
(3.3V)?
TROUBLE
IN U20
CHECK
U27 PIN2
VOLTAGE
NO
(3.3V)?
TROUBLE
IN U27
CHECK
U31 PIN2
VOLTAGE
NO
(2.5V)?
TROUBLE
IN U81
(POWER INDICATOR OFF)
CHECK
U23 PIN8
NO
VOLTAGE
SHORT(?)
(14V)?
YES
CH ECK
U23 PIN13 U23 PIN13
NO
VOLTAGE
(5V)?
YES YES
CHECK CHECK
U16 PIN2 U3 PIN2
VOLTAGE VOLTAGE
(2.5V)? (3.3V)?
YES YES
CHECK CHECK
U24 PIN2 U19 PIN2
VOLTAGE VOLTAGE
(3.3V)? (3.3V)?
YES
CHECK END
--6--
U23
TROUBLE IN
NO
14V-GND
POWER B/D
CHECK
NO
CHECK L45
VOLTAGE
(0V)?
TROUBLE IN U23
YES
TROUBLE IN
NO
U13,U16
NO
TROUBLE IN U19
U24