LG 50PJ340 Training Manual page 130

2mS
VR402 224V p/p
Set-up ± 5V
A
0V
VS-DA on the control PWB can be
VR401
B
used as a trigger for Y or Z-SUS.
180uSec ± 5uSec
Set-Dn
75VAC rms "White"
100V 100uS 548V p/p
90VAC rms "Black"
Connect Scope between Waveform
TP on Y-Drive and Gnd
IC110
WARNING:
Remove upper Y-DRIVE
P101 Y-DRIVE UPPER Board completely if P110
BOARD
or P204 is removed.
p/n: EBR63551601
IC120
D401
SET-UP
VR402
FS203 VS
Diode Check reads Open with
Board Disconnected or Connected
P102
Floating
D409
GND
IC130
D407
C105
Y-SUS
p/n: EBR63039801
Test FG5V
across C105 Scan
IC140
250V
220uf
Y Signal
250V
TP
220uf
P108
P110
P103
N/C
250V
220uf
250V
P209
220uf
P201
N/C P204
Y Signal
250V
TP
220uf
-VY
TP
IC201 Scan
SET-DN ZD502 FB ref
for 15VFG
ZD501 Feed Back ref
D504
for VSC regulation
VR401
D503 Grayed out components
-VY
are on the back
ZD501
VR502
T302
IC503
VSC
D501
IC202 VSC
FS204 2A
TP
IC502
Floating 16VDC
D502
Anti PRV
IC302
GND D515 Cathode
Q503 Source for +16V
Q502
D515
IC508 IC510
Anode = 15VFG
FG5V
2
1 D511
FL201 D513 3 T502 D504 Cathode Source for VSC
2
P212 1 D503 Cathode Source for -Vy
D514
3
D512 Cathode Source for 5VFG
IC509
D512
P205 Anode = 5VFG
D511 Cathode Source for 15VFG
P203
P202
P212 "Y-SUS" to P205
IC203
Pin Label Run
Note:
To Check for Y-SUS Drive Waveform
1 SUS_DN (FG) 0V
Connectors
2 FG5V 4.9V With the Y-Drive boards Disconnected
C205
between
3 FG5V 4.9V
rd
Use the 3 screw on the left from the bottom.
4 SUS_DN (FG) 0V
P212~P205
Test FG5V
5 SUS_DN (FG) 0V
and WARNING:
across C205 6 YB_CLK 0.86V
P204~P110
7 YB_CLK 0.86V
Remove lower Y-DRIVE
Va
8 YB_STB 2.8V
DO NOT
Board completely if P212
9 YB_STB 2.8V
come with
P203
10 YTB_OC1 2.2V
a new or P205 is removed.
11 YTB_OC1 2.2V
board
IC204 12 YT_DATA 0V
13 YT_DATA 0V
14 YB_OC2 2.63V P203 "Y-SUS" and P122 "X-Left"
15 YB_OC2 2.63V
16 SUS_DN (FG) FG Pin Run
17 SUS_DN (FG) FG
1,2,3 Gnd
Y-DRIVE Lower 4 nc
5,6,7 VA Voltage
p/n: EBR63551701
P122
X-Board Left
p/n: EBR64062301
P101 P102 P103
50PJ350 (50T1 Panel) CIRCUIT INTERCONNECT DIAGRAM
50PJ350 (50T1 Panel) CIRCUIT INTERCONNECT DIAGRAM
SMPS Stand-Alone 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. To Test the Set without Main board, leave P812 connected. Do not use light bulbs.
See "Auto Gen" on the Control board to perform a Panel Test.
If all supplies do not run when A/C is applied, disconnect P812 to isolate the excessive load.
VA TP
VS TP
F801
4A
Step 1: RL_On command turns on the 17V, 250V
+5V, AC-Det and Error_Det. If Missing, the
set will Shut Off after 10 Seconds.
Error_Det. is not used by the Main.
Step 2: M5 On command Turns on M5V,
then Va, then Vs.
P211 "Y-SUS" to "Z-SUS" P2
Pin Label Run Diode
P211
1~2 Gnd Gnd Gnd
3 n/c n/c n/c
FS203 4~5 +Vs *206V Open
4A
6 n/c n/c n/c
VS
7~11 ER_PASS 98V~102V Open
P210 "Y-SUS" to "SMPS" P812 a
Note: The RL_On turns on +5V, 17V Error Det. and AC_DET.
P210
b
P210 P812 Note: The M5-On command turns on M5V, Va and Vs.
Pin Label Run
c
Diode Diode Note: The Error Det line is not used in this model.
1~2 VS *195V Open Open d Note: If the AC Det line is Missing, the TV will turn off in 10 Seconds.
e
Note: Pin 18 is grounded on the Main. If opened, the power
3 n/c n/c n/c n/c
supply turns on automatically.
4~5 Gnd Gnd Gnd Gnd
6~7 VA *60V Open Open
8 Gnd Gnd Gnd Gnd
9~10 M5V 5.1V 1.19V 2.1V
FS201 10A
VA
FS201 Va
Diode Check reads Open
with Board Disconnected
or Connected Control Board Test
With the unit on, if D201 is not on, check 5V
FS202 M5V
FS202
supply from FS202 on the Y-SUS.
Diode Check reads
10A
0.97V Board Connected Also on pins 4~7 of P111. If present
5VDC
or 1.19 Disconnected replace the Control Board. If missing,
See (To Test Control Board)
P102
IC231
1~3 (16V) 4-7 (M5V)
P101 Ribbon Cable
P111
Y-SUS and Y Drive Signals IC101
FS204 Protects 16V Creation
D501 and IC501.
Diode Check 1.61V
IC801
With Board Disconnected or
(1) 1.79V
1.59V Connected
IC801
(2) 3.29V
Note: IC231 (3.3V Regulator) (3) n/c
(4) 0V
routed to all X Boards
(5) 0V
P161
To Test Control Board:
Disconnect all connectors.
* If the complaint is no video and
Jump STBY 5V from SMPS P813 Pin 13 to pin
shorting the points (AutoGen) causes
3 (bottom leg) of IC231.
video to appear suspect the Main
Apply AC and turn on the Set. Observe Control
board or LVDS cable.
board LED D201, if it's on, most likely Control
Note: LVDS Cable must be removed
board is OK.
for Auto Gen to work.
X-Drive Center and Left
Diode Check
RGB Signals
Gnd
nc VA, 3.3V and X-Drive
Open
Left RGB Signals
P231
P121 P212
Va out on pins 1~5 Va in on pins 48-50
3.3V in on pins 11~12 3.3V out on pins 41~42
P104 P105
P201
P812
T901
VS
ADJ
Stand-By: 0.9V
Run: 388V SMPS
p/n: EAY60968701
ZD803
VA
T902
ADJ
D805
D609
ZD401
ZD302
D307 ZD301
D601
ZD101
ZD303
D303
D601
D305
Stand-By: 1.5V T301
F302
Run: 388V
2.5A
D308
250V
L601
D309 F101
D302 D103
D306
10A
D301
250V
P813
L602
* If 16V is missing check FS204 on the Y-Sus.
SC101
If AC-Det is missing, as a work around test,
Jump the STBY-5V to the AC-Det line. If the set works
normally, then the SMPS is defective.
If the Main board is the problem, perform the normal
Panel Test to confirm the Main is the only problem.
Z-Drive Creation Signals
P101 Connector "Control" to "Z-SUS Board" P1
P301 "Main" to "SMPS" P813
Pin Label Run Diode
Pin
1 (+15V) 16V Open
2 (+15V) 16V Open
1~2
3 (+5V) 4.9V 1.52V
3~4
4 (+5V) 4.9V 1.52V
5~7
5 Gnd Gnd Gnd
8
6 Y_OE 0.058V 3.09V
7 ZBIAS 1.83V Open
9~12
8 Slop_Ctl Gnd Open
13~14
9 Z_ER 0.14V Open
15
10 ZSUS_DN 0.77V Open
11 ZSUS_UP 0.17V Open 16
12 Gnd Gnd Gnd
17
Ft IR
P121
Intelligent
X101 Sensor P100
IC141
IC231
(1) Gnd
IC211
(2) 3.29V
IC211
(1) Gnd
(3) 4.94V
(2) 1.8V IR Board
IC101
(3) 3.27V
p/n: EBR65007704
IC1
Measuring Voltage on
P101
Auto Gen
PANEL TEST: Pin 1 of P101 with DVM
turns the TV on. If TV is
Disconnect P301,
CONTROL
VS_DA Remove LVDS Cable. on, Input Menu pops up.
D201
BOARD
Short across Auto Gen
3.3V from IC231
p/n:
LED P101 (Ft IR) to Key Pad
TPs to generate a test
Pins 56~60
EBR63549501
pattern. When A/C Pin Stby/Run
P162
power is applied.
1~8 0.07V/0.16V
P704 "Main" to P100 (Ft IR)
Pin Label
Pin Label STBY Run Diode
1 IR 3.3V 3.76V 3.12V 9 Gnd
2 Gnd Gnd 10 3.3V_ST
Gnd Gnd
3 Key 1 3.3V 1.53V 11 3.3V_MST
3.29V
4 Key 2 3.3V 1.53V 12 LED Blue
3.29V
5 LED-R
2.7V 0.21V Open
6 Gnd
Gnd Gnd Gnd
3.3V and X-Drive 7 SCL 0V
3.27V 2.64V
8 SDA 0.25V 3.27V
Center and Right 2.64V
VA, 3.3V and X-Drive Right RGB Signals
RGB Signals
P232
X-Board Center
3.3V in on
p/n: EBR64062201
Pins 1-5
3.3V out on pins 11 & 12
P203 P204 P205
P202
P813 "SMPS" to P301 "Main"
Pin Label STBY Run No Load Diode
1~2 16V 0V 17V 17V 3.17V
3~4 Gnd Gnd Gnd Gnd Gnd
5~7 5V 0.46V 5.17V 5.19V 1.13V
8 Error_Det 2.85V 4.9V 4.9V 3.0V
FS1 Diode Check
9~12 Gnd Gnd Gnd Gnd Gnd
Open with Board
13~14 STBY_5V 3.46V 5.14V 5.19V 2.56V Connected or
Disconnected
15 RL_ON 0V 2.43V 0V Open
16 AC Det 0V 4.44V 4.92V 3.1V
250V 250V
17 M_ON 0V 3.29V 0V Open 220uf
FS1 220uf
18 Auto_Gnd Gnd Gnd 4.84V Open
P1 "Z-SUS Board" to "Control" P101
D309
Pin Label Run Diode
P2 "Z-SUS" to
*1~2 (+15V) 16V Open
"Y-SUS" P111
*3~4 (+15V) 16V Open
Pin
Diode
5 Gnd Gnd Gnd
6 Y_OE 0.058V Open 1~2
Gnd
7 ZBIAS 1.83V 2.82V
3 n/c
P2
8 Slope_Ctl 0.086V 2.82V
4~5 Open
9 Z_ER 0.14V 2.82V
6 n/c
10 ZSUS_DN 0.77V 2.82V
11 ZSUS_UP 0.17V 2.82V
7~11 Open
12 Gnd Gnd Gnd
VZB TP
+
-
P1
VR201
The Z-SUS can NOT be run Stand-Alone
Label STBY Run No Load Diode
16V 0V 17V 17V Open
Gnd Gnd Gnd Gnd Gnd
5V 0.46V 5.17V 5.19V 0.94V
Error_Det 2.85V 4.9V 4.9V 3.04V
Gnd Gnd Gnd Gnd Gnd
NOTE: Diode tests are conducted with the board disconnected.
STBY_5V 3.46V 5.14V 5.19V 1.07V
RL_ON 0V 2.43V 0V 2.62V
AC Det 0V 4.44V 4.92V 3.1V
M_ON 0V 3.29V 0V Open
LVDS
Ft Key Pad
To SMPS
P101
C
D2
P301
Q301
A1 A2
IC201
B E 1 2
IC302 STBY
C
3
P704
Regulator
G S
3 Q302
1
To Ft IR
D
2 Grayed out components
IC303 Mstar
are on the back
Micro/
IC801 D1 Video
L803
X1
C1
A 12Mhz
C2
Diode
P801
L804
MAIN BOARD
2.4V
IC703
p/n: EBT60953802
To SPK
D502
A1 A2
IC502
C
STBY Run Diode
B E
A2 Q501
Gnd Gnd Gnd
C
C
D501
A1
3.3V 3.29V 0.85V
IC503
0V 3.31V 0.50V
0V 0V Open
A2 B E
C E C
Q503 Q702
A1 B
D504 C
IC602
P211 P331
Va out on pins 1-5 Va in on pins 48-50
3.3V in on pins 41~42
P301 P302
P206
50VAC rms "White"
46VAC rms "Black"
Connect Scope between
Waveform TP J36 on Z board
and Gnd. Use RMS
information just to check for
board activity.
VS-DA on the control PWB can be
used as a trigger for Y or Z-SUS.
50V 100uS 248V p/p
250V 250V
220uf 220uf
P101
D312
Z-SUS J36
p/n: EBR63040301
Z-SUS
OUT
TP
P102
P3
P201
P7
P202
IC301
1 3
P703
IC308
2
IC202
IC501
L313
IC1 IC701
IC203
IC402
IC304
X402
2 25Mhz B E
Q303
C
B E G S
Q504
3 1
C D
Q304
31.875Mhz
Q402
X401 Q404
E B C D505
C B A1
C
E B E
Q401 C A2
C
B E IC504
Q403
1 3
IC401
IC306
2
Tuner
3
1
IC307
2
X-Board Right
p/n: EBR64062001
P303 P304 P305