LG 47LY96-ZB (CHASSIS:LD75A) Service Manual ▷ View online
- 5 -
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following technique
should be used to remove and replace the IC. When working with
boards using the familiar round hole, use the standard technique
as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by gently
prying up on the lead with the soldering iron tip as the solder
melts.
melts.
2. Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
Removal/Replacement
1. Remove the defective transistor by clipping its leads as close as
possible to the component body.
2. Bend into a "U" shape the end of each of three leads remaining
on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the corresponding
4. Connect the replacement transistor leads to the corresponding
leads extending from the circuit board and crimp the "U" with
long nose pliers to insure metal to metal contact then solder
each connection.
long nose pliers to insure metal to metal contact then solder
each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heat sink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the circuit
board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heat sink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board hollow
stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board to
prevent excessive component temperatures.
component and adjacent components and the circuit board to
prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board. The
following guidelines and procedures should be followed whenever
this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
following procedure to install a jumper wire on the copper pattern
side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely necessary).
2. carefully scratch away the solder resist and acrylic coating (if
used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away copper
pattern and let it overlap the previously scraped end of the good
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
copper pattern. Solder the overlapped area and clip off any
excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper pattern
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
at connections other than IC Pins. This technique involves the
installation of a jumper wire on the component side of the circuit
board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a hazardous
condition will not exist if the jumper wire opens.
condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the pattern
break and locate the nearest component that is directly
connected to the affected copper pattern.
connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of the
nearest component on one side of the pattern break to the lead
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so the
it does not touch components or sharp edges.
- 6 -
1. Application range
This spec sheet is applied to the 37", 42", 47" LCD TV used
LD75A chassis.
LD75A chassis.
2. Specification
Each part is tested as below without special appointment.
(1) Temperature : 25 ± 5°C(77 ± 9°F), CST : 40 ± 5°C
(2) Relative Humidity : 65% ± 10%
(3) Power Voltage : Standard input voltage (100-240V~,
(2) Relative Humidity : 65% ± 10%
(3) Power Voltage : Standard input voltage (100-240V~,
50/60Hz)
*Standard Voltage of each products is marked by models
(4) Specification and performance of each parts are followed
each drawing and specification by part number in
accordance with BOM.
accordance with BOM.
(5) The receiver must be operated for about 20 minutes prior
to the adjustment.
3. Test method
(1) Performance : LGE TV test method followed
(2) Demanded other specification
(2) Demanded other specification
Safety
: CE, IEC Specification
EMC
: CE, IEC
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. General Specification(FHD Module)
Item
Specification
Measurement
Result
Remark
Display Screen Device
47/42/37 inch Wide Color Display Module
LCD
Aspect Ratio
16:9
LCD Module
37LB5DF (37LF65): LC370WU1-SL01
42LB5DF (42LF65): LC420WU2-SLB1
47LB5DF (47LF65): LC470WU1-SLB2
37LY3DF (37LY95): LC370WU1-SL01
42LY3DF (42LY95): LC420WU2-SLC1
47LY3DF (47LY95): LC470WU4-SLC1
Operating Environment
1) Temp. : 0 ~ 40 deg
2) Humidity : 10 ~ 90%
LGE SPEC
Storage Environment
3) Temp. : -20 ~ 50 deg
4) Humidity : 10 ~ 90 %
Input Voltage
AC100 ~ 240V, 50/60Hz
Maker LG
- 7 -
5. Chroma & Brightness
5-1. FHD Module(47LF65(47LB5DF))
Item
Min
Typ
Max
Unit
Measurement Result
Remark
Viewing Angle
R/L
178
Viewing
R/L
178
<CR>10>
U/D
178
Angle<CR>10>
U/D
178
White average
47LF65
450
550
-
cd/m
2
- 100IRE Full White Pattern(255gray)
brightness
- Picture : Dynamic (Cool)
Brightness uniformity
1.3
0
1.3
cd/m
2
- 100IRE Full White Pattern(255gray)
- Picture : Dynamic (Cool)
Color
White
X
0.261
0.276
0.291
- 85IRE Full White Pattern (216 gray)
Coordinate
Y
0.268
0.283
0.298
- Picture : Dynamic (Cool)
Red
X
0.603
0.618
0.633
Y
0.318
0.333
0.348
Green
X
0.260
0.275
0.290
Y
0.568
0.583
0.598
Blue
X
0.132
0.147
0.162
Y
0.046
0.061
0.076
Color coordinate uniformity -0.03
Average
+0.03
- 85IRE Full White Pattern (216 gray)
- Picture : Dynamic (Cool)
Contrast Ratio CR with
- Full white(100IRE)
at dark room
PWM-Dimming
4000 : 1 5000 : 1
- Full black(0IRE) pattern
CR without
(600:1) (800:1)
- Picture : Dynamic (Cool)
PWM-Dimming
-Input:TV/DTV/AV1,2,3/Comp/HDMI1,2
-> CR with PWM-Dimming
RGB/HDMI-PC
-> CR without PWM-Dimming
Color
Medium
8300
9300
10300
- 85IRE Full White Pattern (216 gray)
Temperature
Warm
5500
6500
7500
- Picture : Dynamic (Cool)
Cool
10000
11000
12000
Color pull in
PAL
-500
+500
Hz
Range
NTSC
-500
+500
Hz
Color killer Sensitivity
-80
dBm
*** PWM-Dimming function works after 30 seconds. So, When you check the CR, you must wait 30 minutes for check the Full Black
level and then 10 minutes for check the Full White level.***
- 8 -
5-2. FHD Module(42LF65(42LB5DF)
Item
Min
Typ
Max
Unit
Measurement Result
Remark
Viewing Angle
R/L
178
Viewing Angle
R/L
178
<CR>10>
U/D
178
<CR>10>
U/D
178
White average
42LF65
450
550
-
cd/m
2
- 100IRE Full White Pattern (255gray)
brightness
- Picture : Dynamic (Cool)
Brightness uniformity
1.3
0
1.3
cd/m
2
- 100IRE Full White Pattern (255gray)
- Picture : Dynamic (Cool)
Color
White
X
0.261
0.276
0.291
- 85IRE Full White Pattern (216 gray)
Coordinate
Y
0.268
0.283
0.298
- Picture : Dynamic (Cool)
Red
X
0.603
0.618
0.633
Y
0.318
0.333
0.348
Green
X
0.260
0.275
0.290
Y
0.568
0.583
0.598
Blue
X
0.132
0.147
0.162
Y
0.046
0.061
0.076
Color coordinate uniformity
-0.03
Average
+0.03
- 85IRE Full White Pattern (216 gray)
- Picture : Dynamic (Cool)
Contrast Ratio
CR with
- Full white(100IRE)
at dark room
PWM-Dimming
4000 : 1 5000 : 1
- Full black(0IRE) pattern
CR without
(400:1) (600:1)
- Picture : Dynamic (Cool)
PWM-Dimming
-Input:TV/DTV/AV1,2,3/Comp/HDMI1,2
-> CR with PWM-Dimming
RGB/HDMI-PC
-> CR without PWM-Dimming
Color
Medium
8300
9300
10300
- 85IRE Full White Pattern (216 gray)
Temperature
Warm
5500
6500
7500
- Picture : Dynamic (Cool)
Cool
10000
11000
12000
Color pull in
PAL
-500
+500
Hz
Range
NTSC
-500
+500
Hz
Color killer Sensitivity
-80
dBm
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