LG 42PJ350 Training Manual page 129

Waveform TP on the Y-Drive Board
(A) VR601
Set-up
155Vpp ± 5V
100V 2mSec 540V p/p A
Y-DRIVE BOARD
0V
p/n: EBR63633601
(B) VR401
B
Set-Dn
170uSec ± 5uSec
P201
69VAC rms "White"
100V 100uS
72VAC rms "Black"
IC101
Connect Scope between Waveform TP on Y-Drive and Gnd
FPC
To Check for Y-SUS Drive Waveform
128 Pins on top of the Y- With the Y-Drive boards Disconnected
Drive PWB. TPs are found
Use the Left leg of C213 or screw location M213.
on the bottom of the PWB Should be close to 422vpp.
IC102
FS201 M5V
D21
FS203 VA
FS202 VS
Y Drive
TP Y-SUS BOARD
IC703
M217
p/n: EBR63038301
D33
P202
Q22
Q16
Q33
IC103 FG
Q21
Q15
IC701
IC702
IC601
M216
Q31
IC104
P203
Q13
VR601
Set-UP
M215
Q12
Q41
IC105 Q11
FG
-Vy
VR501
P204 VSC
TP
VSC VR401
M214 TP -VY
Set-Dn
VR501
VSC
Labeled +15V
Q503
Meters 18V
D502
Q501 T501
IC106
SCAN TP
D503
D513
M213
15V FG
VR502
IC501
J18
C213
IC502
IC301
C519
P211 IC510
T502
FG 15V VR502
IC303
IC202
D508 -Vy
P106
D506
C520
FG 5V
P209
P205
D509
J393
IC509
IC201
IC107
P211 "Y-SUS" Odd Pins to "Y-Drive" P106
Red Lead on FG
Pin Label Run Diode Check Diode Check
1 SUS_DN (FG) FG FG FG
2 SUS_DN (FG) FG FG FG
3 OC2 2.63V 1.46V 0.68V
4 OC2 2.63V 1.45V 0.68V
5 DATA 0V 1.36V 0.53V
IC108
6 DATA 0V 1.36V 0.55V
7 OC1 2.2V 1.45V 0.68V
P206 8 OC1 2.2V 1.45V 0.68V
9 STB 2.8V 1.36V 0.53V
10 STB 2.8V 1.36V 0.66V
11 CLK 0.86V 1.36V 0.53V
WARNING: 12 CLK 0.86V 1.36V 0.53V
13 SUS_DN (FG) FG FG FG
Remove the Y-DRIVE
14 SUS_DN (FG) FG FG FG
Board completely if P211
15 FG5V 4.9V 1.97V 0.59V
16 FG5V 4.9V 1.96V 0.56V
or P106 is removed.
17 SUS_DN (FG) FG FG FG
Pin Run Diode Check
1,2 GND GND
3 nc nc
4,5
VA Open
P201
P202
42PJ350 (42T1 Panel) CIRCUIT INTERCONNECT DIAGRAM
42PJ350 (42T1 Panel) CIRCUIT INTERCONNECT DIAGRAM
NOTE: Diode tests are conducted with the board disconnected.
NOTE: Grayed components are on the back of the PWB.
P811 "SMPS" to P201 "Y-SUS
Pin Label STBY Run Diode Check
1 Vs 0V *206V Open
2 Vs 0V *206V Open
3 n/c n/c n/c n/c
4 Gnd Gnd Gnd Gnd F801
4A 250V
5 Gnd Gnd Gnd Gnd
2.6V STBY
6 Va 0V *60V Open
390V Run
7 Va 0V *60V Open
8 Gnd Gnd Gnd Gnd
9 M5V 0V 5.25V 2.12V
540V p/p
10 M5V 0V 5.25V 2.12V
* Note: This voltage will vary by Panel label
SMPS Diode Voltages
Loc STBY Run
*D601 2.6V 390.0V
*D801 0 192.0V Q602
*D802 0 6.16V
* Note: Voltages taken *D807 .23V 195.0V
from HOT GND. *D307 12.26V 15.6V
*D609 13.81V 21.8V
P206 *D303 14.06V 22.58V Q601
*D305 160.6V 467.0V
*D308 160.6V 389.9V
*D309 160.6V 389.9V
*D306 56.2V 62.6V
*D302 56.2V 62.9V
Q603
*D301 57.0V 62.7V
*D102 1.3V 56.8V
D904 0 205.0V
P206 "Y-SUS" to "Z-SUS" P2
FS201
Pin Label Run Diode Check
125V
1~2 +Vs *205V Open
4A (M5V)
3 n/c n/c n/c
D712
4~7 ER_COM *133V Open
8 n/c n/c n/c
D713
9~12 Gnd Gnd Gnd
D31
* Note: This voltage will vary in accordance with Panel Label
P201 Control board test :
FS201 0.65V with all Disconnect all connectors.
connectors connected,
Jump STBY 5V from SMPS P813 Pin 13.
1.11V with all connectors
Apply AC and turn on the Set. Observe Control board
FS202
removed.
125V LED, if it's on, most likely Control board is OK.
4A (VS) With the unit on, if D101 is not on, check 5V supply.
VR601
FS203 Open with all
connectors connected. If present replace the Control Board. If missing, check
FS201 and see (To Test Power Supply)
* If the complaint is no video and shorting
From M5V
T502 Driver IC509 the points (AutoGen) causes video to appear
18V – D506
suspect the Main board or LVDS cable.
*FG 5V – D509 or C520
Note: LVDS Cable must be removed for Auto
VR401
*FG 15V – D508 or C519
Gen to work.
From VS
T501 Driver IC501
Control Board
FS203
-VY – D502
p/n: EBR63632301
IC401
125V
VSC – D503 to Q501
10A (VA)
*NOTE: J393 must be grounded when
D716
testing these with only M5V supplied to P101
the PWB.
J461
P101
Pin 4-7 (M5V)
TCP/Cntl 3.3V Reg
IC103
Pin 1-3 (18V)
Ribbon Cable
(1) Gnd
OE TP
Y-SUS and Y Drive Signals (2) 3.3V
J11
(3) 5V
IC102
Note: IC121 (3.3V Regulator)
routed to all X Boards
P101 "Y-SUS" to P101 "Control"
P209 Y-SUS
Pin Run Diode Check Pin Label Run Diode Check Pin Label Run Diode Check
1,2 VA Open 1 +15V 18.24V 1.14V 2 +15V 18.24V
3 nc nc 3 +15V 18.24V 1.14V 4 +5V 5V
4,5 Gnd Gnd 5 +5V 5V 1.11V 6 +5V 5V
7 +5V 5V 1.11V 8 Gnd Gnd
9 Gnd Gnd Gnd 10 Gnd Gnd
11 Gnd Gnd Gnd 12 Dummy_2 2.14V
13 Y-OE 0.02V 1.81V 14 OC2 1.85V
15 ER_DN 1.05V 2.81V 16 DATA 0V
17 ER_UP 0.26V 2.81V 18 BLK 1.4V
19 SET_UP 0.24V 2.81V 20 STB 1.5V
21 Dummy_5 1.05V 3.19V 22 CLK 0.59V
23 SUS_DN 2.75V 2.81V 24 Dummy_3 1.97V
25 Dummy_1 1.04V 2.81V 26 Dummy_4 1.23V
27 SUS_UP 0.05V 2.81V 28 CTL_OE 0.23V
29 SET_DN 2.10V 2.81V 30 Gnd Gnd
Pin Run Diode Check
P233
1,2 GND GND
X-Board Left
3 nc nc
p/n: EBR63628801
4,5 VA
Open
P203 P204 P205
D904
NOTE: Grayed components
are on the back of the PWB.
VS ADJ
Q902
VS
D801
Q901
Q801
VA ADJ
Q504
VA
D807 Q501
D802
At Power Off
Q802
POWER SUPPLY 3sec 1 st Relay click
p/n: EAY60912401 nd
4sec 2 Relay click
Q355
M5V
D307
D609
Q351
D303
IC301
D601
F302 2.5A 160V STBY
389V Run Q352 (Run 5v)
250V
D352
L691
T301 17V
D305
IC701
Q356
Q351
D308
(STBY 5V)
D309
D302 D102
D306
F101
RL103
10A 250V
D301
L602
CN701
RL101
D101
n/c
P813
SC101
AC In
Step 1: RL_On command turns on the a Note: The RL_On command turns on the 5V,17V and AC_DET.
PANEL TEST:
b
Note: The M5-On command turns on M5V, Va and Vs.
Remove LVDS Cable. 17V for Audio P813 pins 1 and 2. Also
c
Note: The Error Det line is not used in this model.
AC-Det (16) turns on. If Missing, the
Short across Auto Gen
d
Note: If the AC Det line is Missing, the TV will turn off in ten
TPs to generate a test set will not turn on. RL_On also turns
on the Error Det (8) from SMPS but it is
pattern. e
Note: Pin 18 is grounded on the Main. If opened by pulling
not used by the Main.
Step 2: M5 On command Turns on 5V
to the Main (P813 pins 5~7) also the
M5V, then Va, then Vs.
*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.
P163 P102
IC171
P121 (1) Gnd
25Mhz X103
(2) 1.2V
IC121
(3) 3.3V
VS_DA
IC121
IC201 IC103
D101
IC171
Auto Gen To Speakers
LED
All Pins 8.39V
3.3V TP
P161 P162
Diode: (Open)
"Control" P102P1 to "Z-SUS Board"
Pin Label Run Diode Check
P100
1.14V 1 Gnd Gnd Gnd
Ft IR P101
2 Y-OE 0.0V Open
1.11V
3 Dummy-1 1.9V Open
1.11V
Gnd 4 CTL_OE 0.0V Open
Ft Key Pad
5 ER_UP 0.1V Open
Gnd
2.80V 6 ZSUS_DN 0.86V Open
2.81V 7 ZSUS_UP 0.15V Gnd
8 Gnd Gnd Gnd
2.81V
2.81V 9 (+5V) 5V 1.47V
2.81V 10 (+5V) 5V 1.47V
2.81V
11 (+15V) 18.24V Open
2.81V 12 (+15V) 18.24V Open
3.19V
* Note: This voltage will rise to
3.18V
3.37V at turn ON then drop to 0V
Gnd
Pin
P232 P331
P211 P311
1,2
P232 P331
3.3V in 3.3V in
4,5
on Pins on Pins
9, 10, 11 42, 43, 44
P206 P301
P206 "Y-SUS" to "Z-SUS" P2
Pin Label Run Diode Check * Note: This voltage will vary in
accordance with Panel Label
1~2 +Vs *205V Open
3 n/c n/c n/c
4~7 ER_COM *133V Open
6 n/c n/c n/c
9~12 Gnd Gnd Gnd
Connect Scope between Waveform TP J43 on Z-SUS and Gnd
P2
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 voltages should run.
If all supplies do not run when A/C is
applied, disconnect P811 to isolate the
excessive load. See "Auto Gen" on the
Control board to perform a Panel Test.
VZB TP
P813 "SMPS" to P301 "Main"
R151
Pin Label STBY Run No Load Diode
1~2 17V 0V 16.8V 16.79V Open
3~4 Gnd Gnd Gnd Gnd Gnd
5~7 5V 0.47V 5.24V 5.25V 1.29V
8 Error_Det 2.88V 4.93V 4.91V 2.96V
VR1 Q2
9~12 Gnd Gnd Gnd Gnd Gnd
13~14 STBY_5V 3.49V 5.23V 5.25V 2.43V
VR1
15 RL_ON 0V 2.43V 0.0V Open
VZB
16 AC Det 0V 4.45V 4.93V 2.95V
P1
Q3
17 M_ON 0V 3.27V 0.0V Open
18 Auto_Gnd Gnd Gnd 4.84V 2.34V
Q4
P1 "Z SUS Board" to "Control" P102
Pin Label Run
seconds.
1 Gnd Gnd
2 Y-OE - 0.0V
P813, the power supply will turn on automatically. 3 Dummy -1 1 1.9V
4 CTL_OE 0.0V
5 ER_UP 0.1V
LVDS 6 ZSUS_DN 0.86V
To SMPS Q301
IC301
IC201
C
IC302
1
C
P301 B
E 1 2
A1 A2
C 3 D2
P704
G S
1 D
3
IC202
Q302
IC303
To Ft IR
2
IC1
Mstar
L803
Micro/
D1
12Mhz
IC801 Video
C2
To SPK
A X1
C1
B
P802 MAIN BOARD
Q304
p/n: EBT60953602
IC703
L804
D502
A1 A2
C
IC502
B E
Q501
C A2
C
IC503 A1 D501
Q702
A2 B E
C E
Q503 C
A1 C B
D504
IC602
P100 "IR Board" to "Main" P704 P101 Connector "Ft. IR" to "Front Key"
Pin Label STBY Run Diode Check Stand-By
Pin STBY Run Diode Check
1 IR 3.43V 4.9V Open Waveform No
2 Gnd Gnd Gnd Gnd
1 0.07 0.16 2.4V
3 Key_CTL_0 3.29V 3.29V 2.52V
2 0.07 0.16 2.4V
4 Key_CTL_1 3.29V 3.29V 2.52V
3 0.07 0.16 2.4V
5 LED_RED 2.72V 0V 3.13V
4 0.07 0.16 2.4V
6 Gnd Gnd Gnd Gnd
5 0.07 0.16 2.4V
7 EYE_SCL 0V 3.29V 2.22V
6 0.07 0.16 2.4V
8 EYE_SDA 0.23V 3.29V 2.21V
7 0.07 0.16 2.4V
9 Gnd Gnd Gnd Gnd
8 0.07 0.16 2.4V
10 3.3VST 3.29V 3.29V 2.17V
Measure with a Scope
11 3.3V_MST 0V 3.29V 2.25V
12 LED_BLUE 0V *0V Open
Measuring Voltage on Pin 1 with DVM turns the TV on. If TV is on, Input Menu pops up.
Run Diode Check
TCP TEST REMOVED
GND GND
Red Lead on TCP VA Open
3 X-Board Right
nc nc
Black Lead on TCP VA 0.59V
p/n: EBR63628701
VA
Open
Red Lead on TCP 3.3V Open
Black Lead on TCP 3.3V 1.08V
P303 P304
P302
* Note: This voltage will
vary in accordance with
Panel Label
*Vzb
110V
50VAC rms "White"
50V 200uS 242V p/p
46VAC rms "Black"
P4
Q201
Z-Bias
Waveform
J43
D101
Q202
J43
Q203
Z-SUS BOARD
p/n: EBR63038801
Q205
D103
Q206
P3
Q202
Q102
- P2
Diode Check Pin Label Run Diode Check
Gnd 7 ZSUS_UP 0.15V 2.82V
Z Sub BOARD
Open 8 Gnd Gnd Gnd
2.82V 9 (+5V) 5V Open p/n: EBR63634601
Gnd 10 (+5V) 5V Open
2.82V 11 (+15V) 18.24V 1.9V
2.82V 12 (+15V) 18.24V 1.9V
3
P703
P1
IC308
2
IC203
IC501
Q703
E
C IC701
B
L313
NOTE: Grayed components
are on the back of the PWB.
IC402
X402 Q504
IC304 B E
25Mhz
Q303 C
2
E G S Q402 Q404
C D
X401 Q401 Q403
3 1
E B
C A1
31.875Mhz
C B E C
A2
E B D505
C
C
B E
IC401 IC504
1 3
IC306
2
TUNER
1 3
IC307
2
TCP IC Diagram
Run
Waveform No.
No 12 No 0
No 13 No 1
No 14 No 2
No 15 No 3
No 16 No 4
No 17 No 5
No 18 No 6
No 19 No 7
TCP TESTING
TCP INSTALLED
Red Lead on TCP VA Open
Black Lead on TCP VA 0.52V
Red Lead on TCP 3.3V 0.6V
Black Lead on TCP 3.3V 0.39V
P305 P306