DOWNLOAD LG 42LH50 (CHASSIS:LA91L) Service Manual ↓ Size: 11.44 MB | Pages: 40 in PDF or view online for FREE

Model
42LH50 (CHASSIS:LA91L)
Pages
40
Size
11.44 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
42lh50-chassis-la91l.pdf
Date
PREV: LG 42LH45YD (CHASSIS:LC91B) Service Manual

LG 42LH50 (CHASSIS:LA91L) Service Manual ▷ View online

- 17 -
1. Power-up boot  check
TROUBLESHOOTING
Check standby Voltage
P2400 8pin : +5V_ST
Check Power connector
and AC S/W on?
Check X1100 clock
12MHz
Replace X1100
Check Fuse
Replace Power board
Check P2400 PWR_ON
2Pin : 5V
Re-download software
Replace
BCM3549(IC100)
or Main board
Check Q2406 Output
Level 5V
Replace Q2406
Check Multi Voltage
P2400 13pin : 12V
Replace Power board
Check inverter control &
error
P2400 22pin : Low
P2400 20pin : high
Check Power board
or Module
Check IC2404 output
voltage 3.3V
Replace IC2404
Check LVDS output
R1114,R1115....R1125
Replace BCM3549
(IC100) or Main board
NO
NO
NO
OK
NO
NO
NO
NO
NO
OK
OK
OK
OK
OK
OK
OK
OK
OK
- 18 -
2. Digital TV Video
Check RF Cable & Signal
Check Tuner 5V Power
TU2500 4Pin
Check IC2502
Check IF_P/N Signal
Replace Tuner.
Check Check
Demodulator Input
Clock(X1100-12MHz)
Replace X1100
Check IC1101Output
Replace IC1101
Check LVDS output
R1114,R1115....R1125
Replace BCM3549
(IC100)or Main board
NO
NO
NO
NO
NO
OK
OK
OK
OK
OK
3. Analog TV Video
Check RF Cable
Check Tuner 5V Power
TU2500 4Pin
Check IC2502
Check CVBS signal.
TU2500 #19 Pin
Replace Tuner.
Check LVDS output
Replace BCM3549
(IC100)or Main board
NO
NO
NO
OK
OK
OK
- 19 -
4. Component Video
Check input signal format.
Is it supported?
Change to supporting
format
Check Component Cable.
Check JK3403
Replace Jack.
NO
NO
OK
OK
Check LVDS output
Replace BCM3549
(IC100) or Main board
NO
OK
5. RGB Video
Check input signal format.
Is it supported?
Change to supporting
format
Check RGB Cable
conductors for damage.
Check P2100
Replace Jack.
NO
NO
OK
OK
Check LVDS output
Replace BCM3549
(IC100) or Main board
NO
OK
Check EDID
Replace the defective IC
or re-download EDID
data.
NO
OK
Check signal R/G/B/H/V-
Sync C618,C619,C620
Check other set.
If no problem, check
signal line.
NO
OK
- 20 -
6. AV Video
Check input signal format.
Is it supported?
Change to supporting
format
Check AV Cable for
damage or 
open conductor.
Check JK3403(JK2102)
Replace Jack.
NO
NO
OK
OK
Check LVDS output
Replace BCM3549
(IC100) or Main board
NO
OK
7. HDMI Video
Check input signal format.
Is it supported?
Change to supporting
format
Check HDMI Cable for
damage
Check
JK500,501,502,3401
Replace Jack.
NO
NO
OK
OK
Check LVDS output
Replace BCM3549
(IC100) or Main board
NO
Check HDMI Signal
Check other set. If no
problem, check signal
NO
Replace Main board
NO
OK
Check EDID & EEPROM
C500,501,502,505
I2C Signal (pin 5, 6)
Replace the defective IC
or re-download 
EDID data.
NO
OK
Check HDCP key
NVRAM(IC103) power &
I2C Signal (pin 5, 6)
Replace the defective IC.
NO
OK
OK
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