DOWNLOAD LG 55LM4610 / 55LM4650 (CHASSIS:LB21B) Service Manual ↓ Size: 5.03 MB | Pages: 44 in PDF or view online for FREE

Model
55LM4610 55LM4650 (CHASSIS:LB21B)
Pages
44
Size
5.03 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
55lm4610-55lm4650-chassis-lb21b.pdf
Date
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LG 55LM4610 / 55LM4650 (CHASSIS:LB21B) Service Manual ▷ View online

- 17 -
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
.
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
Replace IC3703 .
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
ok
ok
No
No
No
Check CVBS Signal
TU3700 8 Pin
ok
No
Bad Tuner. Replace Tuner
.
- 18 -
Check input signal format.
Is it supported?
Check AV Cable for damage
for damage or open conductor
Check JK1601
CVBS Signal Line
R246 
ok
ok
ok
No
Replace Jack JK1601
ok
Check CVBS_DET Signal
Replace L1603
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
No
4. AV Video
5. Component Video
Check input signal format.
Is it supported?
Check Component Cable
for damage or open conductor.
Check JK1601
Y/PB/PR signal Line
ok
ok
ok
No
Replace Jack JK1601
Check COMP_DET Signal
Replace L1601,  R1614
No
Check Mstar LVDS Output
Replace Mstar(IC101) or Main Board
.
ok
No
- 19 -
Check input signal format.
Is it supported?
Check RGB Cable conductors
for damage or open conductor
Check EDID
I2C Signal
JK1104 Pin12, 15 (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
6. RGB Video
- 20 -
7. HDMI Video
Check input signal format.
Is it supported?
Check HDMI Cable conductors
for damage or open conductor.
Check EDID
JK801, JK802, JK803 
Pin 15, 16
I2C Signal
Check JK801, JK802, JK803
ok
ok
ok
No
No
Replace the defective IC or re-download EDID data
ok
Replace Jack
Check HDMI Signal
Check other set
If no problem, check signal line
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
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