LG 50PZ950B-SA (CHASSIS:PB12A) Service Manual ▷ View online
GPIO
Signal Name
Direction
Description
3
MODEL_OPT_4
IO
4
MODEL_OPT_5
IO
5
SIDE_AV_DET
IO
7
HDMI_HPD_4
IO
10
HDMI_HPD_3
IO
11
MODEL_OPT_1
IO
12
DSUB_DET
IO
13
BT_RESET
IO
14
/RST_HUB
IO
15
BCM_RX
IO
16
BCM_TX
IO
19
FLASH_WP
IO
20
MODEL_OPT_0
IO
22
AUD_MASTER_CLK
IO
23
HDMI_OPT_2
IO
25
HDMI_HPD_1
IO
26
HDMI_POWER_1
IO
27
EPHY_ACTIVE_Y
IO
28
EPHY_LINK
IO
30
BCM_AVC_DEBUG_TX1
IO
MOD_ROM_TX
31
BCM_AVC_DEBUG_RX1
IO
MOD_ROM_RX
GPIO Structure
GPIO
Signal Name
Direction
Description
32
VREG_CTR
IO
33
TUNER_RESET
IO
35
HDMI_POWER_2
IO
36
COMPOSITE1_SW
IO
41
MODEL_OPT_3
IO
BT_ON/OFF
42
WIRELESS_DL_RX
IO
43
WIRELESS_DL_TX
IO
44
FE_TS_VAL
IO
45
HDMI_POWER_3
IO
46
HDMI_POWER_4
IO
47
MODEL_OPT_2
IO
RF_SWITCH_CTRL
48
COMP1_SW
IO
51
DDC_SCL
IO
52
DDC_SDA
IO
53
DDC_SDA(W_OR)
IO
54
DEMOD_RESET
IO
55
COMP2_SW
IO
56
RF_BOOSTER
IO
GPIO Structure
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
15.
Digital TV Recording Fail Trouble Shooting
16.
Analog TV Recording Fail Trouble Shooting
17.
AV Video Recording Fail Trouble Shooting
18.
Digital TV Video Trouble Shooting while recording (Watch & Record)
19.
Digital TV Audio Trouble Shooting while recording (Watch & Record)
20.
Analog TV Video Trouble Shooting while recording (Watch & Record)
21.
Analog TV Audio Trouble Shooting while recording (Watch & Record)
Trouble Shooting Guide for LG Service Man
Please check system, after power Off/On one time
1. Power-Up Boot Fail Trouble Shooting
Replace Power board
N
Y
Check Micom Redownload or
replace
Check P500 All Voltage Level
(17V, 5V, 3.3V, 5V_ST)
Check Power connector
Y
Check Voltage Level 3.3V at C588
N
Replace one of IC505 & Recheck
Y
N
Check Voltage Level 2.5V at L508
N
Replace one of IC502/L508
& Recheck
N
Y
Check Voltage Level 1.5V
at R541
N
Replace one of IC504 & Recheck
N
Y
Check Voltage Level 0.9V at C517
N
Replace one of IC501 & Recheck
N
Y
Check X101 Clock 54MHz
N
Replace X101
Y
Check signal transition
at IC102 #9 pin
N
Maybe BCM35230 has troubles
Replace IC102 Flash Memory
Y
Check All Voltage Level
at Bead
N
Replace one of Bead
& Recheck
Y
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