DOWNLOAD LG 42LK520 (CHASSIS:LA01U) Service Manual ↓ Size: 4.5 MB | Pages: 64 in PDF or view online for FREE

Model
42LK520 (CHASSIS:LA01U)
Pages
64
Size
4.5 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lk520-chassis-la01u.pdf
Date
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Trouble shooting guide
4. AV Video
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
When the model is LK series,
Check JK1604, JK9903
ok
ok
ok
No
Replace Jack
5. Component Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1601 or 1603
Y/PB/PR signal Line
- C211/213/215/217/218/220/222/224
ok
ok
ok
No
Replace Jack
ok
Check CVBS_DET Signal
Replace R9915 or R1666
No
Check Mstar LVDS Output
Replace Mstar(IC100) or Main Board.
No
Check COMP_DET Signal
Replace R1614, R4223 or R1615
No
Check Mstar LVDS Output
Replace Mstar(IC100) or Main Board.
ok
No
Check JK1604 , JK9901
CVBS Signal Line
- C227 , C405
Trouble shooting guide
6. RGB Video
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID & EEPROM
IC1105 I2C Signal
R1141, R1143(SDA,SCL)
Check JK1104
H/V_Sync/R/G/B Signal Line
-R4024/4025/C204/206/208/210
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
Replace Jack
Check DSUB_DET
Replace R1146 or R1147
No
Check Mstar LVDS Output
Replace Mstar(IC100) or Main Board.
ok
No
Trouble shooting guide
7. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID & EEPROM
IC801,IC802,IC804
I2C Signal
Check JK801, JK802, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
Check HDCP Key NVRAM(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
Trouble shooting guide
8. 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, 1.8V.
No
Check Regulator IC404
Check Mstar I2S Output
R503, R504, R505
No
Check signal line. Or replace Mstar(IC101)
Check Mstar AUDIO_MASTER_CLK
TP502
No
Replace Mstar(IC101) or Main Board.
ok
Check AMP I2C Line
R506, R507
No
Check signal line. Or replace Mstar(IC101)
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