Trouble Shooting - Hyundai H-LCD2004 Service Manual

Trouble 1
ok
ok
Check
TDA93XX
OSC
Check
EEPROM
power supply
Check waveform
of IIC bus
Change
EEPROM
No TV signal
Trouble 2
no
Check
VT+33V
Check L961,
L962, Q961,
D961, C961 etc.
no
Indicator light
Check
no
TDA93XX
power supply
3.3v
no
Check
D921,R921,
U921
Change crystal
oscillator
Check U401 RESET
Check tuner
supply +5v
Check IIC
bus of tuner
ok
Check
VT+33V
Check Q271 etc.
Check Y271.
Check C197, R193
Check Q141, Q142,
C151 etc.
yes
Bright
Alternate between
red and blue
Check waveform of
3 wires serial bus
Check U401 power
supply +2.5v&+3.3v
Check U401 OSC
Change U302
Change U301
Check Q801
Check U801
Turn on, red turn to
blue , wait a
moment turn to red
Check U101 power
supply +8v
Check
U931,Q932,
Q931
Change U401
No sound
Check U302
Pin3
ok
Check U302
input
Check U301
Check U301
ok
Check U802
Check U802
power supply
Check U802
Check U802
no
output
input
output
OSC
input