LG 42PW350 - 42 PW350 (42 T3 Panel) CIRCUIT INTERCONNECT DIAGRAM; SMPS to Board Connections; Board to Board Signal Routing

P6
FS2 VA
18V J1
J17
Z-SUS
Waveform
P2
Vzbias TP
R151
P4
10A/125V
7A/125V
6.3A/250V
P7
P3
Top 2 pins
are VA
11~12
Z-SUS
P/N: EBR68342001
FS1 VS
FS3 (M5V)
5V J28
R1
Y-OE
VR1
Vzbias
FS1/FS2: Diode Check
OL: Connected or Disconnected
FS3: Diode Check
0.76V: Connected
1.03V: Disconnected
The Z-SUS will run stand alone.
Disconnect P2 to the Y-SUS.
Disconnect P105 on CTL. Board.
Jump 17V from the SMPS J2
(just left of P813) to Z-SUS J1
(just above P6) connector.
Ground Y-OE Z-SUS (bottom R1).
Output Waveform J17 (281V p/p).
CONTROL BOARD
P/N: EBR71200701
1
2
3
2
X1
25 MHz
IC702
IC101
IC701
IC22
D1
IC703
L1
P105
P107 P108
P22 n/c
Auto Gen
VS_DA
P2
P106
IC53
IC11
3.3V from IC53
Pins 41~43
n/c Upgrades
3.3V from IC53
Pins 8~10
4.94V
1.05V
1.06V
1.05V
3.3V 1.8V
1.8V On
3.31V
3.27V
1
2
3
2
12
3
P201
FPC
All FGnd
P101
1, 2 FG5V
P202
FPCFPC
P203
FPC
P204
P102
FPC
P205
FPC
P206
P106
Waveform
P232
3.3V in on
Pins 9~11
P331
3.3V in on
Pins 42~44
P211
Va in on
Pins 3~4
P311
Va out on
Pins 3~4
42PW350 (42T3 Panel) CIRCUIT INTERCONNECT DIAGRAM
Connect Scope between Waveform TP on Y-Drive and Gnd
Note a:
The RL_On command turns on the 17V, +5V,
Error_Det and AC_DET.
Note b:
The M-On command turns on M5V, Va and Vs.
Note c:
The Error Det line is not used in this model.
Note d:
AC Det line is not used.
Note e:
Pin 18 is grounded on the Main. If opened, the
power supply turn on automatically.
Remove LVDS Cable. Short
across Auto Gen TPs to
generate a test pattern.
* If the complaint is no
video and shorting the
points (AutoGen) causes
video to appear suspect the
Main board or LVDS cable.
Note: LVDS Cable must be
removed for Auto Gen to
work.
With the unit on, if D1 is not on, check 5V supply.
If present replace the Control Board.
If missing, see (To Test Power Supply)
To Test Y-SUS
18V, FG5V & FG15V supplies.
Disconnect all connectors.
Jump M5V from SMPS to Y-SUS.
(J35 bottom of the board is an easy TP).
Ground J73 (OE)
Ground the Y-SUS.
Apply AC to SMPS.
Check 18V, FG5V & FG15V supplies.
Note: IC53 (3.3V
Regulator) routed
to all X Boards
FS501 18V
Diode Check reads
0.85V Board
Connected or 1.13V
Disconnected
To Speakers
All speaker
wires 0V~1V
Soft to Loud
Power LED
P100
IR/Key Board
p/n: EAB62028901
To Ft IR
P6 Pins inverted from P2 on Control
Connect Scope
between Waveform
TP J17 on Z board
and Gnd. Use RMS
information just to
check for board
activity.
P101
P103
P201
P202
P213 "Y-SUS" to "Y-Drive" P101
Pin Label Run
FGnd FGnd
1-2
P212 "Y-SUS" to "Y-Drive" P102
Pin
Label Run
1-10
Black Lead on Floating Gnd
Y-DRIVE BOARD
p/n: EBR69839101
SMPS Test – Unplug P813
to Main board.
Use two (100W) light bulbs in
series between Vs and Gnd
to place a load on the SMPS.
Apply AC, all voltage should
run.
See “Auto Gen” on the
Control board to perform a
Panel Test.
If all supplies do not run
when A/C is applied,
disconnect P811 to isolate
the excessive load.
P813 "SMPS" to P500 "Main"
Pin Label STBY Run No Load Diode
18
e
Auto_Gnd
Gnd Gnd 4.86V Open
17
b
M_ON
0V 3.28V 0V Open
16
a d
AC Det
0V 4.06V 4.94V 3.1V
15
a
RL_ON
0V 3.28V 0V Open
13-14 STBY_5V 3.47V 5.14V 4.94V 2.53V
9-12 Gnd Gnd Gnd Gnd Gnd
8
a c
Error_Det
3.44V 4.02V 4.94V 2.84V
5-7
a
5.1V
0.46V 5.17V 5.22V 2.13V
3-4 Gnd Gnd Gnd Gnd Gnd
1_2
a
17V
0V 17V 17V 3.06V
P811 "Power Supply" to P7 "Z-SUS"
Pin Label Run Diode
1~2 Vs *200V Open
3~4
Gnd Gnd Gnd
5 Va *55V Open
6 M5V 5.0V 1.38V
X-Board Left
p/n: EBR68019901
X-Board Right
p/n: EBR68020001
A
OE should be 0V
(5V indicates a Problem)
Z-SUS Signal
3D sync/ Motion Remote
p/n: EBR72499601
To P1404 Main
*Voltage varies with panel label
Attached to front glass
P1404 on Main to Motion Remote
3D Sync pin 12 (3.48V p/p) 60Hz
Pin 9 or 10 should be high to turn on 3D
RF transmitter on Motion Remote board.
B
Motion
PANEL TEST:
C523
FG5V
+
-
FG
FL1
FGnd FGnd
11-12
FG5V 5V
0V
B
VR601
Set-up
195uSec ± 5uSec
100V 100uS69VRMS 576V p/p
VR401
Set-Dn
A
155V ± 5V
100V 2MSec 577V p/p
Note: Screws on Y-Drive
are Chassis Ground
P203
P312
VA in on
Pins 3~4
Z-SUB BOARD
p/n: EBR71728001
63VRMS 50V 100uSec 230V p/p
VS TP
F302
2.5A/250V
STBY 160V
RUN 390V
P811
P813
VA TP
F101
10A/250V
SMPS
P/N: EAY62170901
P702
SC101
RL103
T901
L601
L602
VS
Supply
VA
Supply
5V
Supply
17V
Supply
F301
4A/250V
STBY 160V
RUN 390V
VR502
VA Adj
VR901
VS Adj
D602
Q601
Q602
D101
Q802
Q801
IC301
Q356
D352
Q355
D351
Q501
D504
D901
D902
P206P205P204P203P202P201 P306P305P304P303P302P301
18V P2 pins 13-15
M5V P2 pin 11-12
18V P6 pins 1-3
M5V P2 pin 4-5
1~3 (18V)
4-7 (M5V)
28~30 (18V)
24-27 (M5V)
IC701 (1.8V Core)
(1) Gnd
(2) 1.8V
(3) 3.31V
IC53 (3.3V Reg)
(1) 4.94V
(2) 3.32V
(3) Gnd
Diode Check
P7 "Z-SUS" to "SMPS" P811
Pin Label Run Diode Check
1~2 +Vs *200V OL
3~4 Gnd Gnd Gnd
5 +Va *55V OL
6 M5V 5.06V 1.03V
* Note: Varies according to Panel Label
P2 "Z-SUS" to "Y-SUS" P206
Pin Label Run
1~4 ER_PASS 98V~102V OL
5 n/c n/c n/c
6~7 +Vs *200V OL
8 n/c n/c n/c
9~11 Gnd Gnd Gnd
12 M5V 5.06V 1.03V
* Note: Varies according to Panel Label
P2 "Control" to P201 "Z-SUS Board"
Diode Check
Pin Label Run
1 Gnd Gnd Gnd
2 SUSUP 0.22V OL
3 Gnd Gnd Gnd
4 SUSDN 0.79V OL
5n/c n/c OL
6 ZBIAS 1.92V OL
7 Gnd Gnd Gnd
8 VZ_CON 3.25V OL
9 CTRL_OE Gnd OL
10 Y-OE 0.05V OL
11~12 M5V 5.06V 1.15V
13~15 (+15V) 18.2V OL
P201 "Z-SUS Board" to P2 "Control"
Pin Label Run Diode Check
1~3 (+15V) 18.2V 2.18V
4~5 M5V 5.06V 1.03V
6Y-OE0.05V OL
7CTRL_OEGnd Gnd
8VZ_CON3.25V OL
9 Gnd Gnd Gnd
10 ZBIAS 1.92V OL
11 n/c n/c OL
12 ZSUSDN 0.79V OL
13 Gnd Gnd Gnd
14 ZSUSUP 0.22V OL
15 Gnd Gnd Gnd
P211 "Y-SUS" to "Y-Drive" P106
Pin Label Run Diode Check
1~2 VSC (Y-Scan) 146.2V OL
3~4 VPP 145V OL
5
n/c n/c
OL
6 SUS_DN (FG) FG FG
7 CLK 0.92V 1.46V
8 STB 2.24V 1.46V
9 OC1 2.26V 1.54V
10 DATA 0V 1.46V
11 OC2 2.8V 1.54V
12 SUS_DN (FG) FG FG
Black Lead on FG (Floating Gnd)
BUFFER OUTPUT
DIODE CHECK
0.8V Red Lead on FGnd
OL Black Lead on FGnd
VSCAN
DIODE CHECK
1.13V Red Lead on FGnd
OL Black Lead on FGnd
Y-DRIVE CHECKS
VPP
DIODE CHECK
0.67V Red Lead on FGnd
OL Black Lead on FGnd
DATA
DIODE CHECK
0.78V Red Lead on FGnd
2.1V Black Lead on FGnd
CLK, LE, OC1, OC2
DIODE CHECK
0.6VV Red Lead on FGnd
OL Black Lead on FGnd
Pins are
reversed
from Y-SUS
Pins are
reversed
From
Y-SUS
IC703
(1) 4.94V
(2) 0V
(3) Gnd
(4) Gnd
(5) Gnd
(6) 0.83V
(7) 0.61V
(8) 0.52V
( 9) 1.92V
(10) 1.06V
(11) 1.06V
(12) 1.06V
(13) 6.1V
(14) 4.96V
(15) 3.31V
(16) 5V
P105 "Control" to P101 "Y-SUS"
Pin Label Run Diode Check
1~3 +15V 18.2V OL
4~7 +5V 4.94V 1.15V
8~11 Gnd Gnd Gnd
12 Dumy2 2.14V OL
13 Y-OE 0.03V OL
14 PC 1.84V OL
15 ER_DN 0.5V OL
16 DATA_PRE 0.01V OL
17 ER_UP 0.3V OL
18 SC_A 1.45V OL
19 RAMP_UP 0.22V OL
20 STB 1.5V OL
21 RAMP_BLK 1.07V OL
22 CLK 0.6V OL
23 SUS_DN 2.71V OL
24 DUMMY_3 2.14V OL
25 DUMMY_1 1.07V OL
26 DUMMY_4 1.35V OL
27 SUS_UP_0 0.75V OL
28 CTRL_OE 0.11V OL
29 RAMP_DN 2.17V OL
30 Gnd Gnd Gnd
D506 18V Source
D502 -Vy Source 200V
D503 VSC Source 146V
P212
P211
P213
-Vy TP
R201
-Vy Adj
VR502
P101
P206
Y-SUS
P/N: EBR68341901
C213
T501
T502
FG5V
J54
OE J73
FS501
18V
18V J55
M5V J13
FG15V
J66
VR601
Set-Up
VR401
Set-Dn
D506
D502
D503
D508 FG15V Source
IC508 FG5V Source
Back of Board
Scan FG
M5V J35
There are Chocolate pieces
between the Y-SUS and the Panel.
Be sure to return them to there
correct location if they should fall off
when removing the Y-SUS.
FG5V
Diode Check reads
1.33V Board Connected
or 1.63V Disconnected
FG5V
Diode Check reads
1.33V Board Connected
or OL Disconnected
Ribbon Cable
Y-SUS and Y Drive Signals
See Waveform
Above
Bottom 2
Pins are VA
4~5
Diode Check TCP disconnected
Red Lead on TCP VA OL
Black Lead on TCP VA 0.5V
Red Lead on TCP 3.3V OL
Black Lead on TCP 3.3V 0.53V
EC OL either way
P902 "MAIN" to "Front IR"
Pin Label STBY Run
1 IR 2.84V 2.7V
2 Gnd Gnd Gnd
3 Key1 3.3V 3.3V
4 Key2 3.3V 3.3V
5 LED_RED 3.25V 0V
6 Gnd Gnd Gnd
7 EYE_SCL 3.3V 3.3V
8 EYE_SDA 3.3V 3.3V
9 Gnd Gnd Gnd
10 3.3VST 3.3V 3.3V
11 n/c n/c n/c
12 n/c n/c n/c
13 Touch_Ver_Check 0.19V 0V
14 n/c n/c n/c
15 n/c n/c n/c
P1401
IC1400
P902
1
2
3
2
P1404
1
2
3
2
IC1401
IC700
P700
1
2
3
2
IC1406
IC506
IC504
IC1407
IC1202
123
1
2
3
IC600
IC507
IC1404
L1402
IC502
L503
D
G
S
Q501
L506IC1201
A2 A1
C
D200
IC103
L502
Q1401
D
G
S
D
G
S
Q1402
X1400
C
BE
Q1400
P501
X200
24Mhz
L700L701
L702
L703
R-R+L-L+
D501
IC501
TUNER
MAIN BOARD
p/n: EBT61267425 AUSLLJR
Other Main Boards
p/n: EBR72942901 AUSLLHR
p/n: EBR71638619
Interchangeable
Q901
C
BE
24Mhz
18. IF p
17. IF n
16. IF
AGC
15. Reset
14. 3.3V
13. 1.26V
12. GND
11. CVBS
10. NC
9. SIF
8. NC
7. SDA
6. SCL
5. NC
4. NC
3. 5V
2. NC
1. NC
TU1300
IC101
Micro/
Video
Processor
C
A1 A2
IC1402
D805
IC1101
IC804
C
B
E
Q807
Q1304
C
BE
C
BE
Q1305
IC901
IC900
IC801
C
BE
Q805
C
A1A2
D803
IC802
C
B
E
C
A1
A2
D804
Q103
C
B
E
Q806
1
D801
C
A1
A2
IC104
IC102
IC109
123
IC505
C
B
E
Q500
3
12
IC500
Q800
C
B
E
Q900
NAND
FLASH
3.3V_ST
5V_ST in (3)
+1.5V_DDR_IN
+5V_ST_EN In in
Serial Flash
DDR
Audio Amp
EDID
EDID
RS232
EDID
DDR
DDR
3D Formatter
+1.8V
+3.3V_3D_A In (3)
Serial Flash
+1.0V
+5V in
+3.3V Reg
+5V in (3)
HDCP EEPROM
EEPROM
+1.26V_VDDC) Reg
+5V_ST_EN In
+5V_ST_EN Switch
+5V_ST In
+3.3V
+5V in
+2.5V_AVDD
+3.3V_AVDD
USB +5V OCP
+5V in
+5V_TU
17V in
+3.3V_AVDD
+5V_ST_EN In
EDID
+1.2V_DE
+3.3V in (3)
Tuner SIF
Tuner CVBS
Hot Swap
B+ Routing
Q501 CTL
HDMI CEC
Hot Swap
EDID WP
RS232 TX
Buffer
Hot
Swap
+3.3V_3D Reg
SDA_3.3V_MOD
SCL_3.3V_MOD
LED_Red
Driver
Serial Flash
WP
Ribbon Cable
LVDS
See 2
nd
page for
Waveforms
A
To Motion
Remote
3D Sync
To P902 Main
B
WITH NO Y-DRIVE (Board removed completely)
116VRMS 100V 2mSec 485V p/p
112VRMS 100V 2mSec 470V p/p
DO NOT USE THIS TP FOR ADJUSTMENTS
Waveform Taken from C213 Left Side with Y-DRIVES