LG 50PQ30 Training Manual page 136

4mS
Y-DRIVE WAVEFORM
VR601
V Set-Up (Ramp)
Waveform TP
+ -
On Y-Drive PWB 150V 5V
A
Note: Test points
0V
are not identified
on the board.
V Set-
B
Just above P108
Down
Just below P109
VR401
150us +
5us
-
80VAC rms 400uS 516V P/P
Y-Drive
Upper
Connect Scope between Waveform TP on Y-Drive and Gnd
Use RMS information just to check for board activity.
P209
P209
P VR601
10
P109 SET-UP
Y-SUSTAIN
9
FG5V
FL101
P
P106
10
FG5V
P108
6
+ side
FS202
1) FGnd C105
4A/250V
P204
2) FGnd
C105
3) FGnd
- +
4) n/c
5) VScan Diode Check
P
6) VScan
10
(In Circuit)
7
P203
P108
P209
P209
P205
6) FGnd
5) FGnd
4) FGnd
- +
3) n/c
2) VScan
1) VScan
-Vy TP
VR501
R201
VSC
D503
P208 D502
IC503
Vscan
T501
(*134V) VR502
IC502
-
+
From FG -Vy
P206 D501
IC303
C214
C205
VSC TP
FS501 (17V)
- C213 Q503
R202
T502
125V/4A
+
P207
FL201
P202
FG5V
12) Vscan (134V)
11) VScan (134V) P202 / P122
10) n/c
Pin Label Run
Diode Check
9) FG5V (5V)
1~3 Gnd Gnd
8) FG5V (5V)
4 n/c n/c
7) FGnd
6) Clk (0.9V)
5~7 *Va 60V Open
Y-Drive
5) STB (2.3V)
*Varies according to Panel Label
Lower 4) OC1 (2.2V)
3) DATA (0V)
2) OC2 (2.9V)
1) FGnd
To Check FG5V to the Y Drive, measure
across capacitor C205
The voltage is supplied thru FL201.
All Y-Drive voltages measured from FGnd.
X-Board Left
3.3V in on
Pins 10~11
P101 P102 P103 P104
50PQ30 (50G2 Panel) CIRCUIT INTERCONNECT DIAGRAM 50PQ30 (50G2 Panel) CIRCUIT INTERCONNECT DIAGRAM
NOTE: Diode tests are conducted with the PWB disconnected.
P811
P811 SMPS
Pin Label Diode
* (Vs) (Va) Varies
9,10 M5V 2V
according to
Panel Label
8 Gnd Gnd
6-7 *Va Open
4-5 Gnd Gnd
3 nc nc
1~2 *Vs Open
P206 Y-SUS
Pin Label Run Diode
1~2
M5V 5.1V 0.86V
3~6
Gnd Gnd Gnd
n/c n/c n/c
7
8~9 ER_COM *90V
Open
P206
n/c n/c n/c
10
11~12 Vs *193V Open
P201 Y-SUS
Pin Label Run Diode
1-2 Vs *193V Open
3 nc nc nc
Gnd Gnd Gnd
4-5
P201 1.3V VDDC REG
6-7 Va *60V Open
1) 5.4V
FS201
8 Gnd Gnd Gnd
Open
2) 4.95V
10A/125V
9,10 M5V 5.1V 3) 1.3V
M5V 0.86V
4) Gnd
*Varies according to Panel Label
Diode Check
Note: IC221 (3.3V Regulator) routed
0.79V (In Circuit)
out P162 (56~60) to Center X Board
1.2V (No Connectors)
IC221
M5V
Pin 1 (Gnd)
Gnd Gnd Pin 2 (3.3V)
1~3) 17V
Pin 3 (4.95V)
4~7) 5V FL111
M5V
FL112
FL111 FL112
15V and 5V
P101 5V Fuses
2
Pin 1~3 (17V)
Ribbon Cable
Pin 4~7 (M5V)
VR401
SET-DN
Y-SUS and Y Drive Signals
17V
30
P111
IC241
FS201
Pin 1 (0.8V) Pin 8 (3.3V)
10A/125V
Pin 2 (Gnd) Pin 7 (Gnd)
Va
Diode Check
Pin 3 (4.96V) Pin 6 (Gnd)
1.33V
Pin 4 (5.74V) Pin 5 (4.91V)
Diode Check
Open
With the unit on, if D201 does not blink
on/off, check 5V supply.
If present replace the Control PCB.
Gnd
Va If missing, see (To Test Control Board)
n/c
P101 (Side Key) to J2 (Ft IR)
Pin Label Run
Diode Check
1 Gnd Gnd Gnd
2 Gnd Gnd Gnd
3, 4 Key 3.3V Open
P122 X-Drive RGB Signals
Va
P121
3.3V
3.3V is not routed
P121 Va out
P212 P212
through this connector
on
Va in
3.3V out
Pins 1~4
Pins 46~50
Pins 39~40
P201 P202
P105
P813
Pin Label STBY Run No Load
17V turns on with
1, 2 17V 0V 17V 17V
Vs On command
3, 4 Gnd Gnd Gnd Gnd
12V turns on with
R502
5, 6 12V 0V 12V 12V
RL On command
7, 8 Gnd Gnd Gnd Gnd
5V turns on with
9~11 5V 5V 5V 5V VA Adj
RL On command
12 Stby 5V 5V 5V 5V
VS Adj
13, 14 13, 14 Gnd Gnd Gnd
R901
15, 16 15, 16 Gnd Gnd Gnd/nc
17 5V Det 0V 4.8V 5V 5V Det from SMPS when
5V (9~11) turns on
18 AC Det 4.6V 4.5V 5V
19 RL On 0V 3.3V 0V
Step 1 SMPS
20 Vs On 0V 3.3V 0V
Step 3 POWER
21 M5 On 0V 3.3V 0V
Step 2
SUPPLY
22 Auto Gnd 0V 0V 5V
23 Stby5V 5V 5.1V 5V
24 Key On 0V 0V 5V
Main Power SW Out
5.1V
A/C IN
SC101
Stand-By 5V shuts off
Main Front Side Regulators Main Back Side Regulators
IC201 NV RAM IC202 HDCP
IC302 IC804 USB
1,2) Gnd 1,2) Gnd
POWER
3) 3.29V
3,4) Gnd
5) 0.9V 1) 5V 4) 0V
5,6) 3.29V 4) Gnd
6) 0.9V 2) Gnd 5) 0V
7) Gnd 5,6) 3.29V
7) 4.9V 3) 3.3V 6) 5V
8) 3.29V 7) Gnd
8) 3.6V
8) 3.3V
LVDS
Software
To Test Control board: Unplug all
Upgrades n/c
connectors. Jump 5V from SMPS
Pin 1 (3.3V) (P813 pin 23) to pin 1 of IC211.
IC141
Pin 2 (0V)
P121
P131 Observe LED. If it blinks, most likely
Pin 3 (3.3V)
IC221
Pin 4 (Gnd) Control PWB is OK. FL111 and FL112
X101 Pin 5 (3.3V)
should be checked.
Pin 6 (0V)
25 Meg IC211
Pin 7 (3.3V)
To check M5V route, disconnect P201
CONTROL PCB Pin 1 (5V) Pin 8 (0V)
IC231
from the Y-SUS Board and connect a
Pin 2 (1.8V)
P101
Pin 1 (Gnd)
Pin 3 (Gnd) Jumper from Pin 1 of P811 (M5V) to
Pin 2 (3.3V)
IC201 Pin 10 P201 (5V).
Pin 3 (4.95V)
Auto Gen
IC241
The 5V is then routed to the Control
Board via FS201, Ribbon Cable P101
D201
on the Y-SUS to P111 and FL111 and
P161 P162
FL112 on the Control Board for Control
Board operation verification. Watch
D201 for blinking to confirm.
From Pin 2 IC221
(3.3V) Short across the two points labeled
P162 Auto Gen to generate a test pattern.
Pins 56~60
(Note: Must Remove LVDS Cable).
* If the complaint is no video and shorting
the points (AutoGen) causes video to appear
suspect the Main board or LVDS cable.
X-Drive RGB 3.3V
Signals
P231 P232
P211
3.3V in on Va out on
Pins 1~5 Pins 1~4
X-Board Center
P203 P204 P205
VS to Z-SUS and Error Com from the Z-SUS
SMPS Test – Unplug P813, ground pin 24.
If all supplies do not run when A/C is
reapplied, disconnect P811 to isolate the
excessive load. Use two (100W) light bulbs
in series connected between Vs and Gnd to
test under a load.
P100
Pin Label Run
1 Gnd Gnd
2 0.05V
Z Enable P101
3 1.8V
Z Bias
1~2) +5V (5.1V)
4
Z Ramp 1.7V
3~6) Gnd
5 Gnd Gnd
7) n/c
8~9) ER_COM (90)
6
Z ER Up 0.3V
10) n/c
7 Z ER Dn 0.4V
11~12) +Vs
Z SUS Up 0.2V
8
* (Vs) Variable
Z SUS Dn
9 0.8V
according to Panel
10
Gnd Gnd Label
11 +15V 17V
+15V
12 17V
P813
To run the Z-SUS without the
Y-SUS, jump VS from the
SMPS to pin 11 or 12 P101.
IC602, IC802
Jump M5V to pin 1 or 2 P101.
1) 5V
2) 4.6V Jump Audio 17V from SMPS
to pin 11 or 12 of P100.
3) 4.6V
Jump M5V to the Control
4) 3.3V
5,6,7,8) Gnd Board.
Z-Drive Signals 17V
Diode Check
1.354V
(In Circuit)
Q303
3
G S
IC301
2 1
P1001
D
IC302
C
P1006 Q301
1 2 3
B E
IC305
2
IC503
9V Reg
D1001
C A D303
L1012 C
A-C
IC1001
A
B
C C
E
Q1002
Audio
E B
SW301
Amp Q1001
P1005
L1013
Reset IC1
IC601
To
IC301
A A
D802
4 3
Speakers
IC803 3.3VST
K Q801
Reg
1 2
(All Pins
Gnd
B E D628 1
8.5V) D805
K
Q892
A
K
A C 2 3.3V
A
A
K
B E
IC802 D627 3
5V
B E
A A
C
Q890 Q601
A
K C
A IC602
D804 K
D633
A A
P1001
Pin Label STBY Run Pin Label
1 IR 4.8V 4.8V 5 *PKEY
2 Gnd Gnd Gnd 6 Gnd
3 Key 1 0V 3.3V 7 EyeSCL
X-Drive RGB Signals
4 Key 2 0V 3.3V 8 EyeSDA
Va
P211
P331
3.3V
3.3V out 3.3V in
P331
X-Board Right
on Pins
On Pins
Va in on
12, 5~6 38, 43, 44
Pins 47~50
P206 P301 P302 P303
Z-SUS
Signal
39V (AC) rms 400us 220Vp/p
Connect Scope between Waveform TP on Z board and Gnd
Use RMS information just to check for board activity.
Diode Check VZB TP Top Side
Open
R271 or R272 To J125
(In Circuit)
P101
Vs fuse
J125
FS100
FS102
250V/4A
FS100
VZB Adj
P104
125V/10A
VR200
(M5V)
Z Bias
Z-SUS PWB
Waveform
J27
L200 P105
P100
FS101
125V/4A
(15V)
P103
To Z-SUB
P301
LVDS
LVDS IC804 USB
IC304
Processor
1 2 3 1) 5.1V 3) 3.2V 5) 0V
2) Gnd 4) 0V 6) 5.1V
IC203
IC804
2
P1003
L318 IC201 LVDS
Micro/Video
IC202
Processor
Q504
USB
Analog Digital
IC1 S (0V) S (3.3V) IC204
G (3.3V) G (0V) D502
B E
X501
Q302 D (3.3V) D (3.3V)
C
X1 Q504
25Mhz
IC504
G S Out
B E
HDMI
C
Q501 IC502
12Mhz MAIN BOARD Q891
Q502
D
C C
In Gnd
Out E B C
19 Video
Q503
E B
IC304 IC305 IC502 IC503 IC505
E B
SIF 16
1.8VMST 3.3VMST 1.2VPVSB Reg Tuner Tuner (5V) 15
IC805
Reg Reg On = Digital CH 9V Reg 5V Reg
K=4.7V
DIF - 13
Gnd 12V DIF + 12
0.6V Gnd 3.8V
A=0V A=5V
1.85V 3.0V In 0V/3.3V Gnd 5.0V
D806
TUNER
3.3V 4.9V Out 0V/1.2V 8V
8V
TUNER TU501 IC505
(5V) 4
2
TDVW-H103F
K A Tuner
ZD601 5V Reg
1
3 2 1
Grayed Out ICs are located on Back
STBY Run Pin Label STBY Run Pin Label STBY Run
0V 0V 9 Gnd Gnd Gnd 13 LED R 3.23V 0V
Gnd Gnd 10 5VST 5V 5V 14 LED W 0V 3.23V
0V 3.3V 11 3.3VST 0V 5V 15 PWM 0V 0V
0V 3.3V 12 Gnd Gnd Gnd
*PKEY (pin 5) Normal 0V.
If 5V Main Power Switch is
Open. STBY5V turns off.
P304 P305