LG 37LT560C / 37LT560E (CHASSIS:LA2AC) Service Manual ▷ View online
- 17 -
6. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
R884,R888 I2C Signal
Check JK801, JK802, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
Check HDCP EEPROM(IC103)
Power & I2C Signal
Replace the defective IC.
ok
No
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
ok
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board.
ok
No
Replace Main Board
No
Check HDMI_DET(HPD)
No
ok
Replace R830,R828,R862
- 18 -
7. All Source Audio
Check the TV Speaker Menu
(Menu -> Sound -> TV Speaker)
On
ok
ok
Check Output Signal P501
1, 2, 3, 4 pin.
Replace Audio AMP IC(IC501)
ok
No
Check Connector & P501
Replace connector
if found to be damaged.
ok
No
Check speaker resistance
and connector damage.
Replace speaker.
ok
No
Off
Toggle the Menu
Check AMP IC(IC501) Power
24V, 3.3V
No
Replace Amp IC(IC501)
Check Mstar I2S Output
IC501 9,10,11 Pin
No
Check signal line. Or replace Mstar(IC101)
Check Mstar AUDIO_MASTER_CLK
R148
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R140, R141
No
Check signal line. Or replace Mstar(IC101)
- 19 -
8. Digital TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
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
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
9. Analog TV Audio
Check RF Cable & Signal
Follow procedure
‘7. All source audio’
trouble shooting guide.
ok
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 .
ok
ok
ok
No
No
No
Bad Tuner. Replace Tuner.
- 20 -
10. AV Audio
11. External Speaker Out
Check AV Cable for damage
for damage or open conductor
Check JK1604 Signal Line
R1685,R1684
ok
ok
No
Replace Jack(JK1604)
Follow procedure
‘8. All source audio’
trouble shooting guide.
ok
ok
Check Output Signal JK1801
8, 3, 4, 5 pin.
Replace Phone Jack(JK1801)
ok
No
Check JK1801
Replace Phone Jack
if found to be damaged.
ok
No
Check External Speaker
Replace External speaker.
ok
No
Check AMP IC(IC1800) Power 5V
L426
No
Replace L426
Check AMP IC(IC1800) Output
2,12,14, 24 Pin
No
Check signal line. Or replace AMP IC(IC1800)
Check Mstar External AUDIO output
R16
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP IC(IC1800) Mute High
R1853, 15pin
No
Check signal line. Or replace Mstar(IC101)
ok
Check OP AMP IC(IC1601) output
R18, 14pin
No
Replace R18 or IC1601
Click on the first or last page to see other 37LT560C / 37LT560E (CHASSIS:LA2AC) service manuals if exist.