LG 50PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
1.
Power-Up Boot Fail Trouble Shooting
2.
No OSD Trouble Shooting
3.
Digital TV Video Trouble Shooting
4.
Analog TV Video Trouble Shooting
5.
Component Video Trouble Shooting
6.
RGB Video Trouble Shooting
7.
AV Video Trouble Shooting
8.
HDMI Video Trouble Shooting
9.
All Source Audio Trouble Shooting
10.
Digital TV Audio Trouble Shooting
11.
Analog TV Audio Trouble Shooting
12.
Component / RGB / AV Audio Trouble Shooting
13.
HDMI Audio Trouble Shooting
14.
USB Trouble Shooting
Trouble Shooting Guide for LG Service Man
Please check system, after power Off/On one time
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
(Audio Out)
(USB)
Side USB
1. Power-Up Boot Fail Trouble Shooting
(Micom)
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
EXT_IN
HDMI 1
CVBS
TP
NANDFlash
128MB
NANDFlash
128MB
USB2.0
SPDIF
SIF
I2S_S7LR
HDMI 2
Serial_Flash
1MB
Serial_Flash
1MB
Side USB
HDMI 3
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Comp1/2, RGB)
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
REAR HDMI_PORT
1. Power-Up Boot Fail Trouble Shooting
Replace Power board
N
Y
Check SW Redownload or replace
Check P501 All Voltage Level
(17V, 5V, 3.5/5V_ST)
Check Power connector
Y
Check Voltage Level 3.3V at IC504,
L508
N
If IC504 Output is normal,
Replace of the IC504
& Recheck
Y
N
Check Voltage Level 1.26V at L503
N
Check R506 voltage level
(3.3V RL_ON)
Replace one of IC101 & Recheck
N
Y
Check Voltage Level 1.5V
At L502
N
Check R503 voltage level
(ON/OFF Control)
Replace one of IC101 & Recheck
N
Y
Check Voltage Level 2.5V at L510
N
Replace one of IC101 and application
circuit & Recheck
N
Y
Check X200 Clock24MHz
N
Replace X200
Y
Check signal transition
at IC103
N
Maybe Serial Flash Memory
problem
Check signal transition
IC104
Y
Check All Voltage Level
at Bead, RL_ON, IC101 output
N
Replace one of Bead, IC101
& Recheck
Y
N
Maybe NAND Flash Memory or
S7LR have troubles
Y
Check DDR Memory
/Replace one
Check S7LR Main chip and
Soc_Reset Signal from PM GPIO
N
N
N
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
NANDFlash
128MB
NANDFlash
128MB
(Audio Out)
SPDIF
I2S_S7LR
Serial_Flash
1MB
Serial_Flash
1MB
(USB)
2. No OSD Trouble Shooting
EXT_IN
HDMI 1
CVBS
TP
SIF
HDMI 2
HDMI 3
USB2.0
Side USB
Side USB
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Comp1/2, RGB)
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
REAR HDMI_PORT
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