LG 22LT560C (CHASSIS:LA2AA) Service Manual ▷ View online
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11. External Speaker Out
(1) Connect external speaker to speaker out port with phone jack on TV side as below
(2) Check the Max. speaker output is 1W or not. Sine wave with 1KHz will be displayed
(3) Check Both of the signal in speaker.
(Power only mode -> Fived 1W Default)
-> Check the input signal(1KHZ, Sine wave) and the wave of output by utilizing oscilloscope.
Recommended Input Signal
: RF, 1kHz, Sine wave
: RF, 1kHz, Sine wave
*
must remove Ground pin in plug
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TROUBLESHOOTING
1. Power-up boot check
Check stand-by Voltage.
JK3300 1pin : 24V
Check L3304, L3308
+24V/+15V, +24V_LED line
Short Check
Check X201 clock
24 MHz
Replace X201
Check IC3304/3305/3310 Output Voltage
IC3304 : +1.1V_VDDC
IC3305 : +1.5V_DDR
IC3310 : +2.5V_Normal
Check Stand by Voltage
C3375 : +3.5V_ST
Replace IC3307
Check Panel VCC Voltage
C3355 : +5V(22inch) or +12V(26inch)
Check Q3305 / Q3307
and other passive elements
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
Replace LCD Module
ok
ok
ok
ok
ok
ok
No
ok
Replace Adaptor
ok
Check L3317
and other passive elements
ok
Check AVDD_NODIE voltage
L206
Replace L206
ok
Check +12V/+15V voltage
C3372 (+12V)
ok
Check RL_ON_BUFFER Signal
Check L3316
and other passive elements
ok
Replace IC3306
ok
Check +5V_Normal voltage
L3309 (+5V)
Check L3305
and other passive elements
ok
Replace IC3300
Check +3.3V_Normal voltage
L3318 (+3.3V)
Check Q3311
and other passive elements
ok
Check POWER_ON/OFF_1 Signal
Replace Q3312
ok
ok
ok
Check L3314
and other passive elements
ok
Replace IC3304 / IC3305 / IC3310
Check LED driver Power Voltage
C3368 : +24V
ok
Check Q3308 / Q3309
and other passive elements
ok
Replace LCD Module
ok
Replace LCD Module
Check Indicator LED On (RED)
No
No
No
No
No
No
No
No
No
No
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2. Digital TV Video
3. Analog TV Video
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check IF_P/N Signal
TU3700 10/11 Pin
Replace IC3703
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner
.
Check RF Cable & Signal
Check Tuner 3.3V Power
L3703
Replace L3703
Check Tuner 1.8V Power
IC3703 2 pin : 1.8V
Check CVBS Signal
TU3700 8 Pin
Replace IC3703 .
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
ok
ok
ok
No
No
No
No
Bad Tuner. Replace Tuner
.
- 16 -
4. AV Video
5. RGB Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK1604, CVBS Signal Line
R246
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R1152
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
No
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
R1140, R1139(SDA,SCL)
Check JK1104
H/V_Sync/R/G/B Signal Line
ok
ok
ok
No
No
re-download EDID data ,Replace Mstar(IC101) or Main Board
ok
Replace Jack
Check DSUB_DET
Replace R1146 or R1147
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
No
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