LG 50PK950 Training Manual page 161

67VAC rms "White"
VR402
4mS 81VAC rms "Black"
320V p/p ± 5V
Set-up
A
0V
VR401
B
180uSec ± 5uSec
Set-Dn
WARNING:
Remove upper Y-DRIVE
100V 100uS 502V p/p
Board completely if P117
is removed.
Connect Scope between Waveform
TP on Y-Drive and Gnd
FPC
140 Pins on top
136 Pins on bottom
Per Connector
Y-DRIVE UPPER BOARD
p/n: EBR62293901
Y-Drive
Upper
FS102 Vs or FS103 Va
Diode Check reads Open
FG
VSC
with Board Disconnected or
FG -Vy
R324 Connected
R334
FS102
6.3A / 250V
(VS)
VR301
Waveform
VSC
P117
P109
VSCAN
Scan
Pins FS101 M5V
15-20
Diode Check reads
15-20
0.948V Board Connected
FG5V
125V RMS
or 1.295 Disconnected
1/2
FG
Right Leg C325
FG
TP with no Y-Drive
FG
127.7RMS
428V p/p
FG
P206
Y-SUS BOARD
C325
VSCAN
FG
FG p/n: EBR62294101
Pins 1-6
125V
P118
RMS
FG5V
19/20
P209 FG15V
FG24V
IC303
VR302
Scan
FG
1-6
-Vy
Waveform
VR402
Set-Up
FG
FG5V
FG FG10V
18V
FG
FS301
D301 2A / 125V
VR401
D303
D313 (18V)
FG24V
Set-Dn
Y-Drive T301
FG11V
Lower
D302
To Check for Y-SUS Drive Waveform
P118 to P209
P117 to P109
With the Y-Drive boards Disconnected
1-6) Scan 1-2) FG5V
Use the Right leg of C325.
07) n/c
03 n/c
Or Pins 15~20 of P117 Or
08) FGnd 04) CLK
Pins 1~6 of P118
09) Data
05) FGnd
WARNING:
10) FGnd 06) STB
11) OC2
07) FGnd Remove Lower Y-DRIVE
12) FGnd 08) OC2
Board completely if P118
Y-DRIVE Lower
13) OC1
09) FGnd
p/n: EBR62294001
is removed.
14) FGnd 10) OC2
15) STB 11) FGnd
Note: Connectors
P114 Y-SUS
16) FGnd 12) Data
between
17) CLK 13) FGnd
P117~P109 and Pin Run Diode Check
18) n/c 14) n/c
P118~P209 1,2,3,4 VA Voltage
19-20) FG5V 15-20) Scan
DO NOT come with a
5 nc
new board
6,7
Gnd
P121
Pin Run Diode Check
X-Board Left
1,2,3,4 VA Voltage Open
p/n: EBR63522201
5 nc
nc
6,7 Gnd Gnd
P101 P102 P103 P104 P105
50PK950 (50R1 Panel) CIRCUIT INTERCONNECT DIAGRAM
50PK950 (50R1 Panel) CIRCUIT INTERCONNECT DIAGRAM
NOTE: Diode tests are conducted with the board disconnected.
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 and P812 to isolate the excessive load.
P812
Step 1: RL_On command
turns on the 17V for Audio F801
P813 pins 1 and 2. Also
4A/250V
AC-Det (16) turns on. If
Missing, the set will not turn
P113
F801
on. RL_On also turns on
Pin Label Diode
0.8V STBY
the Error Det (8) from
1~2 M5V 1.29V
390V Run
SMPS but it is not used by
3 n/c n/c
4-5 *Va Open the Main.
6-7 Gnd Gnd
Step 2: M5 On command
At Power Off
8 n/c n/c
Turns on 5V to the Main
st
3sec 1
9,10 *Vs Open
(P813 pins 5~7) also the
4sec 2 nd
M5V, then Va, then Vs.
P113
P813 SMPS to Main
Pin Label STBY Run Diode
a
1, 2 17V 0V 16.9V 3.186V
3, 4 Gnd Gnd Gnd Gnd
b
5, 7 5V 0.4V 5.19V 1.16V
c
8 Error Det 3.47V 4.11V 3.09V
9-12 Gnd Gnd Gnd Gnd
FS103
4A / 125V
13-14 Stby 5V 3.49V 5.15V 2.55V
(VA)
15 a RL_ON 0V 3.26V Open
FS101
16 a d 0V 4.07V 3.06V
AC_Det
10A / 125V
(M5V) b
17 M_ON 0V 3.26V Open
18 e Auto_Gnd Gnd Gnd Open
Motion Remote Board
p/n: EBR64966601
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)
41-45 Top 4 pins 6-10
IC103
P1
(5V) (18V) (5V)
FL1
FL2
Ribbon Cable
(M5V)
Y-SUS and Y Drive Signals 3.32V
P101
IC53
3.32V
M5V
1-4
(3.3V)
Gnd Gnd
FS301 Protects 18V Creation
IC53
D301, D313 and T301.
M5V
Diode Check 1.32V
FL1, FL2, FL5 P101
With Board Disconnected or
P114
1.058V Connected
1-4
(3.3V)
Note: IC53 (3.3V Regulator)
IC53 P102
Va routed to all X Boards To Left
X Board
To Test Control board:
Disconnect all connectors.
Jump STBY 5V from SMPS P813 Pin 13.
Apply AC and turn on the Set. Observe
Control board LED, if it's on, most likely
Control board is OK.
Open 3.3V and X-Drive
nc
Left RGB Signals
Gnd
Va
P110
P120
P220
3.3V in
Va out Va in on
on Pins
on Pins Pins 1~2
57~60
1~2
P201
P106 P107 P108
VS Adj
P811
VR901
POWER SUPPLY
p/n: EAY60968801 VR501
VA Adj
F302
2.5A/250V
F101 (AC)
15A/250V
CN701
F302
n/c
Relay click
158V STBY
AC In
Relay click
390V Run P813
SC101
a
Note: The RL_On command turns on the 17V and AC_DET.
b
Note: The M-On command turns on +5V, M5V, Va and Vs.
c Note: The Error Det line is not used in this model.
d
Note: If the AC Det line is Missing, the TV will not turn on,
except the Relays, then no other functions. LOGO On.
If AC-Det is missing, as a work around test,
e
Note: Pin 18 is grounded on the Main. If opened, the power
Jump the STBY-5V to the AC-Det line. If the set works
supply turn on automatically.
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.
P2 Control to P107 Z-SUS
Pin Diode Z-Drive Creation Signals
14~15 Open
13 n/c
P1001 Main to Motion Remote
11~12 1.25V
9~10 1.49V
Pin Label
8 Gnd
1 +3.3V
7 Open
2 Gnd
6 Open
CENTER LOGO Board 3
5 Open M_Remote_RX
4 Open 4
p/n: EBT61069102 M_Remote_TX
3 Open
5
RF_Reset
2 Open
6 DC
1 Open
7 DD
For Voltages
8 Gnd
See P107 tabel
To SMPS
To Z-SUS
Board Board
P11 P22 N/C 4.91V
IC52
C72
IC101 IC102
1.84V
FL5
1.8V
L2
p/n: EBR65007705
18V
5.1V
1.82V P2
C86
4.91V
D1 Blinks IC51
4.88V
3.3V
Indicating Board
3.3V
3.3V
Gnd
is Functioning VS-DA
Gnd
D1
1.65V
IC22
P31
IC23
IC1
LVDS
25Mhz
1.7V IC61
X1 1.15V
PANEL TEST:
L1 Remove LVDS
CONTROL BOARD AUTO
Cable. Short across
GEN
1.13V
C76
p/n: EBR63450301
Auto Gen TPs to
P104
1-4 generate a test
To Cent X Board
(3.3V)
To Right pattern.
IC53
X Board
* If the complaint is no video
P703 (Main) to P100 (Ft IR)
and shorting the points
(AutoGen) causes video to Pin Label STBY Run Diode
appear suspect the Main board 1 IR 2.68V
2.82V 2.82V
2 Gnd Gnd Gnd Gnd
or LVDS cable.
3 Key 1 3.14V 3.13V 1.83V
Note: LVDS Cable must be
4 Key 2 3.28V 3.28V 1.77V
removed for Auto Gen to work.
5 LED-R 3.15V 1.77V
0V
6 Gnd Gnd
Gnd Gnd
7 SCL 0.77V 1.76V
3.28V
8 SDA 0.77V 3.28V 1.76V
3.3V and X-Drive
Center RGB Signals
P210
X-Board Center
3.3V in on
p/n: EBR63522101
Pins 57~60
P202 P203 P204 P205 P206
P811 to Z-SUS and P812 to Y-SUS
Pin Label Run Pin Label Run
Diode Diode
1,2 *VS 203V Open 6,7 *VA 60V
Open
n/c n/c
3 n/c 8 Gnd Gnd Gnd
4,5 Gnd Gnd
Gnd 9,10 M5V 5V 2.14V
* Will Vary by Panel
Z-SUS does not use Va or M5V from P102.
Note: M5V routed through Y-SUS, Control
board, in on P107.
P107 Z-SUS to P2 Control
Pin Label Run
Diode FS103
1-2 15V 18.3V 6.3A / 250V
Open
FS103 Diode
(VS)
Check
3
n/c n/c n/c
Open with Board
4-5 M5V 4.92V Open Connected or
Q201
Disconnected
6-7 Gnd Gnd Gnd
P102
8
ZB1 0.80V Open
9
ZBias 0.40V Open Pin
Diode
D208
10 VZB2 0.15V Open 9,10
Open
P102
ERUP 2.50V Open
11 8 n/c
CTRL OE 0.128V Open
12 6,7 Gnd
13
ERDN 0V 4,5 n/c
Gnd
14 SUS UP 0.09V Open 3 Gnd
SUS DN 1.90V Open
15 1,2 n/c
Q204
D211
P107
P400 Main to SMPS
Pin Diode To run the Z-SUS without the Y-SUS; Jump Audio 17V from SMPS
STBY Run Diode
1-2 Open
to pin 1 of P2 Control Board and M5V from P811 to FL1 or FL2 on
3-4 Gnd
0V 3.3V 0.5V
the Control Board. SMPS must be running OK including Vs.
5-7 1.22V
Gnd Gnd Gnd
8 1.84V
0V 3.3V 1.2V
9-12 Gnd
1.2V
0V 3.3V
13-14 1.17V P1001
To
IC1001
0V 2.99V 2.36V
To Motion
15 1.85V LOGO
0V 3.1V 1.72V Remote IC400
16 1.78V
P702
X701
0V 3.1V 1.72V 17 1.84V 10MHz
X700
32.768khz
Gnd Gnd Gnd 18 Gnd
IC700
IC603
For Voltages See P813 table
P902
IC700
P700
LVDS
S B
Q900 Q200
n/c
To Control
G D
D S
A2 A1
G
D200
D S C
IR Board
G SW700
3
Q901
2
1
IC707
P703
Ft IR
P100
IC300
P101
Intelligent
IC705
Sensor
Other
Main
p/n:
Ft Key Pad IC200
B E
Q1300
C
P101 (Ft IR) to Key Pad
G S
Q1301
D Q206
Pin Stby/Run Diode Check
C B B
To Q203 IC100
C
E E
1-4 Open
n/c Speakers A2
D211
C
A1
5-8 Open All Pins
0V C B Q205
B
C
B E E Q202
8.44V C E
E
A2
C B D210
Diode: Q703 Q702 C A1
Q101
(Open) C B
B
C Q204
E
B Q201 E C
C A2
C A1
Pin Label STBY Run Diode E B
D209
Q102
9 Gnd Gnd Gnd
Gnd
P702 Main to Cent LOGO
10 3.3V_ST 3.29V 3.28V 1.13V
11 3.3V_Multi 0.41V 5.18V 1.22V
Diode
Pin Label Stby Run
0V 0V
12 LED W 1.65V
1 +5V 0V 5V Open
2 LED 0V *0V~3V Open
* 3V When the LOGO LED is On.
This line gradually goes high to turn Gnd Gnd Gnd Gnd
3
on and down when going off.
3.3V and X-Drive
Right RGB Signals
Va
P320 P310
P221
Va in on 3.3V in on
Va out on
X-Board Right
Pins 1~2
Pins 1~2 Pins 57~60
p/n: EBR63520701
P207
P301 P302 P303 P304
Z-SUS Signal
Connect Scope
between Waveform TP
J24 on Z board and
Gnd. Use RMS
information just to
check for board
activity.
54VAC rms "White"
50V 100uS 236V p/p
56VAC rms "Black" 50V (AC) rms 400us 225Vp/p
D213
D207
Z-SUS BOARD
p/n: EBR62294201
VZB
R275
Q207
Q206
VR204
Q205
VZB
P201
D221
J24
Z-Bias
50V
Waveform P101
D216
RMS
J24
P105
D215
P102
Q211
Q210
P103
Q209
Q208
P103
Q213
Q214
P106
P202
3 1
L406 P400
IC401
IC405
IC404
2
To SMPS
P900
IC402
n/c
IC602 3
IC604 IC605
IC606
2
1
L408
IC406
B
Q500
C E
IC500
P203
MAIN BOARD
X900
p/n: EBT60955910
54MHz
IC1102
p/n: EBT60955910 50PK950-UA AUSALHR
3 2 1
18. IF p
IC1101
p/n: EBR68027905 50PK950-UA AUSALJR
IC403
17. IF n
p/n: EBT60955914 50PK950-UA AUSALUR
p/n: EBT60955914 50PK950-UA AUSLLUR 16. IF AGC
TU1400
15. Reset
IC1400
TDVJ-H001F
A2 A1 14. 3.3V
1 3 D212
Digital Video C 13. 1.26V
2 E
Q207
B C
C E
IC704 12. GND
B
C Q208
IC702
B E
11. CVBS
Q1402
Analog Video E C
10. NC
B
Q1401
9. SIF
IC101
8. NC
C
Q100 7. SDA
E B
6. SCL
5. NC
4. NC
3. 5V
2. NC
1. NC
P305 P306 P307 P308