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Model
32LD350 32LD350N 32LD358 32LD359 (CHASSIS:LD01B)
Pages
44
Size
4.91 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32ld350-32ld350n-32ld358-32ld359-chassis-ld01b.pdf
Date

LG 32LD350 / 32LD350N / 32LD358 / 32LD359 (CHASSIS:LD01B) 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.
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.
2.  Draw away the melted solder with an anti-static suction-type
solder removal device (or with solder braid) before removing the
IC.
Replacement
1.  Carefully insert the replacement IC in the circuit board.
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
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
leads extending from the circuit board and crimp the "U" with
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
board.
4.  Insert new transistor in the circuit board.
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
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
the two "original" leads. If they are not shiny, reheat them and if
necessary, apply additional solder.
Fuse and Conventional Resistor
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.
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.
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).
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.
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.
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.
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.
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.
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. Module General Specification
1. Application range
This specification is applied to the LCD TV used LD01B
chassis.
2. Requirement for Test
Each part is tested as below without special appointment.
1) Temperature
: 25 ºC ± 5 ºC (77 ºF ± 9 ºF), CST : 40 ºC ± 5 ºC
2) Relative Humidity :  65 % ± 10 %
3) Power Voltage
: Standard input voltage(AC 100-240 V~ 50 / 60 Hz)
* 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.
5) The receiver must be operated for about 5 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed 
2) Demanded other specification 
- Safety: CE, IEC specification
- EMC:CE, IEC 
No.
Item Specification
Remark
1
Display Screen Device
80 cm(32 inch) wide color display module 
CCFL/EEFL LCD
2
Aspect Ratio
16:9
3
LCD Module 
80 cm(32 inch) TFT LCD FHD
4
Storage Environment 
Temp. : -20 ~ 60 deg
Humidity : 10 ~ 90 %
5
Input Voltage 
AC 100-240 V~ 50 / 60 Hz
6
Power Consumption
Power on  (Blue)
LCD (Module) + Backlight(Lamp)
AUO
Typ : 84.6 W
Sharp
Typ : 100 W
7
Pixel Pitch
AUO / Sharp
0.3638 mm x 0.3638 mm
8
Back Light
AUO
CCFL
9
Display Colors
1.06 Billion(FHD LGD),16.7 M (others)
10
Coating
3H, AG
5. Module optical specification
(1) AUO Module
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 45 minutes in a dark environment at 25 ºC ± 2 ºC.
3) The values specified are at approximate distance 50Cm from the LCD surface.
(2) Sharp Module
1) Standard Test Condition (The unit has been ‘ON’)
2) Stable for approximately 45 minutes in a dark environment at 25 ºC ± 2 ºC.
3) The values specified are at approximate distance 50Cm from the LCD surface.
- 7 -
No.
Item Specification 
Min.
Typ.
Max.
Remark
1.
Viewing Angle [CR>10] 
Right/Left(Up/Down)
178
Degree
2.
Luminance Luminance 
(cd/m
2
)
360
450
Variation -
1.3 
MAX 
/MIN
3.
Contrast Ratio 
CR 
4000
5000
4.
CIE Color Coordinates   
RED 
Rx
0.640
Ry
0.330
Green Gx
0.290
Gy
Typ.
0.600
Typ.
Blue Bx 
-0.03
0.150
+0.03
By  
0.060
White Wx
0.280 
Wy 0.290
No.
Item Specification 
Min.
Typ.
Max.
Remark
1.
Viewing Angle [CR>10] 
Right/Left(Up/Down)
176
Degree
2.
Luminance Luminance 
(cd/m
2
)
360
450
Variation -
1.25 
MAX 
/MIN
3.
Contrast Ratio 
CR 
3000
4000
4.
CIE Color Coordinates   
RED 
Rx
0.646
Ry
0.344
Green Gx
0.278
Gy
Typ.
0.607
Typ.
Blue Bx 
-0.03
0.140
+0.03
By  
0.079
White Wx
0.281 
Wy 0.293
- 8 -
6. Component Video Input (Y, C
B
/P
B
, C
R
/P
R
)
No.
Specification
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
1.
720x480 15.73 
60.00 
SDTV,DVD 
480i
2.
720x480 15.63 
59.94 
SDTV,DVD 
480i
3.
720x480
31.47
59.94 480p
4.
720x480
31.50
60.00 480p
5.
720x576 
15.625 
50.00 
SDTV,DVD 625 Line
6.
720x576 31.25 
50.00
HDTV 
576p
7.
1280x720
45.00
50.00 HDTV 
720p
8.
1280x720
44.96
59.94 HDTV 
720p
9.
1280x720 45.00 
60.00 
HDTV 
720p
10.
1920x1080 31.25 
50.00 
HDTV 
1080i
11.
1920x1080
33.75
60.00 HDTV 
1080i
12.
1920x1080 33.72 
59.94 
HDTV 
1080i
13.
1920x1080 56.250 
50 
HDTV 
1080p
14.
1920x1080
67.5 60  HDTV 
1080p
No.
Specification
Proposed
Remark
Resolution
H-freq(kHz)
V-freq(Hz)
Pixel Clock(MHz)
1.
720*400 
31.468 
70.08
28.321 
For only DOS mode
2.
640*480 
31.469 
59.94
25.17 
VESA
Input 848*480 60 Hz, 852*480 60 Hz
-> 640*480 60 Hz Display
3.
800*600
37.879
60.31
40.00 VESA 
4.
1024*768 48.363 60.00
65.00 VESA(XGA) 
5.
1280*768 47.78 59.87
79.5 
WXGA 
 
6.
1360*768 47.72
59.8
84.75 
WXGA
FHD 
Model
7.
1366*768
47.56
59.6
84.75
WXGA
WXGA Model
8.
1280*1024 63.595  60.0 
108.875
SXGA
FHD 
model
9.
1280*720
45
60
74.25
720p
DTV Standard
10.
1920*1080 66.587
59.93
138.625  WUXGA
FHD 
model
7. RGB (PC)
Page of 44
Display

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