LG 50PT250B-SG (CHASSIS:PB12K) Service Manual ▷ View online
13. HDMI Audio Trouble Shooting
Check video output
Y
Follow procedure All source audio
trouble shooting
N
Y
Re-download EDID data
Maybe Mstar S7LR audio block has
problems.
Replace it
Replace it
N
Follow procedure HDMI video
trouble shooting
N
Replace IC801, IC802, IC804
14. USB Trouble Shooting
(Front-end)
(External Input)
(System + Scalar)
I2S_S7LR
STA368
STA368
AV1
AV1_LR
COMP1_LR
COMP2_LR
RGB_LR EXT_IN
AV2
AV2_LR
(Audio Out)
(Comp1/2, RGB)
(USB)
REAR HDMI_PORT
SIDE HDMI_PORT
REAR HDMI_PORT
HDMI 1
HDMI 2
HDMI 3
Side USB
DDR3
256MB(128*2)
DDR3
256MB(128*2)
S7LR
S7LR
HD
LVDS
NANDFlash
128MB
NANDFlash
128MB
SPDIF
I2S_S7LR
Serial_Flash
1MB
Serial_Flash
1MB
EXT_IN
HDMI 1
CVBS
TP
SIF
HDMI 2
HDMI 3
USB2.0
Side USB
CVBS
SIF
SIF
Cab
le
ISDB-T/
PAL/NTSC
IF
Demodulator
MN884433
TP
14. USB Trouble Shooting
• Exception
- USB power could be disabled by inrushing current
- In this case, remove the device and try to reboot the TV (AC power off/on)
Check USB 2.0 Cable
Y
Check JK1102 (Normal)
JK1100 (SVC only)
N
Y
Y
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level
IC1101 #2 (Normal)
L1100 (SVC only)
N
Replace one of
IC1101, L1100 & Recheck
Y
MaybeMstar S7LR (IC101)
has problems. Replace It.
14. USB Trouble Shooting
• Exception
- USB power could be disabled by inrushing current
- In this case, remove the device and try to reboot the TV (AC power off/on)
Check USB 2.0 Cable
Y
Check JK1102 (Normal)
JK1100 (SVC only)
N
Y
Y
Check USB device
If device is 2.5 inch HDD,
Check power adaptor
Replace Jack
Check 5V voltage level
IC1101 #2 (Normal)
L1100 (SVC only)
N
Replace one of
IC1101, L1100 & Recheck
Y
MaybeMstar S7LR (IC101)
has problems. Replace It.