DOWNLOAD LG 32LD452B / 32LD452C (CHASSIS:LA01Z) Service Manual ↓ Size: 4.87 MB | Pages: 48 in PDF or view online for FREE

Model
32LD452B 32LD452C (CHASSIS:LA01Z)
Pages
48
Size
4.87 MB
Type
PDF
Document
Service Manual
Brand
Device
TV / LCD
File
32ld452b-32ld452c-chassis-la01z.pdf
Date

LG 32LD452B / 32LD452C (CHASSIS:LA01Z) 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.
1. Application range
This spec sheet is applied all of the 37”, 42”, 47” LCD TV with
LA01Z chassis. 
2. Requirement for Test
Each part is tested as below without special appointment.
1) Temperature:  25±5ºC, (77°±9ºF), CST: 40±5°C 
2) Relative Humidity:  65±10%
3) Power Voltage : Standard input voltage(100-240V~, 50/60Hz)
* Standard Voltage of each product 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 20 minutes prior to
the adjustment.
3. Test method
1) Performance: LGE TV test method followed 
2) Demanded other specification 
- Safety : UL, CSA, IEC specification 
- EMC: FCC, ICES, IEC specification 
Model
Market
Appliance
Safety : UL1492, CSA C22.2.No.1, 
42LD450C-UA 
EMC : FCC Class B, IEC Class B 
47LD450C-UA
- 6 -
SPECIFICATION
NOTE : Specifications and others are subject to change without notice for improvement.
4. General Specification(TV)
No
Item
Specification
Remark
1
Receivable System
1) ATSC / NTSC-M
2
Available Channel
VHF : 02 ~ 13
UHF : 14 ~ 69
DTV : 02 ~ 69
CATV : 01 ~ 135
CADTV : 01 ~ 135
3
Input Voltage
1) AC 100 ~ 240V 50/60Hz
4
Market
5
Screen Size
47 inch Wide
FHD  
47LD450C-UA /47LD452C-UA
42 inch Wide 
FHD  
42LD450C-UA /42LD452C-UA
37 inch Wide 
FHD  
37LD450C-UA /37LD452C-UA
6
Aspect Ratio
16:9
7
Tuning System
FS
8
LCD Module
LC470WUG-SCA1 
LGD  
47LD450C-UA /47LD452C-UA
LC420WUG-SCA1 LGD 
 
42LD450C-UA/42LD452C-UA
V420H2-L02 CMO 
 
T420HW06-V0 AUO 
 
T370HW03-VB AUO 
37LD450C-UA/37LD452C-UA
LC370WUG-SCA1 
LGD   
9
Operating Environment
Temp  : 0 ~ 40 deg
Humidity : ~ 80 %
10
Storage Environment
Temp  : -20 ~ 60 deg
Humidity : -85 %
- 7 -
6. Component Video Input  (Y, C
B/
P
B
, C
R
/P
R
)
No Resolution 
H-freq(kHz) V-freq.(kHz)  Pixel 
clock 
Proposed 
1. 
720*480 
15.73 
60 
13.5135   
SDTV ,DVD 480I 
2. 
720*480 
15.73 
59.94 
13.5   
SDTV ,DVD 480I 
3. 
720*480 
31.50 
60 
27.027   
SDTV 
4. 
720*480 
31.47 
59.94 
27.0   
SDTV 
5. 
1280*720 
45.00 
60.00 
74.25   
HDTV 
6. 
1280*720 
44.96 
59.94 
74.176   
HDTV 
7. 
1920*1080 
33.75 
60.00 
74.25   
HDTV 
8. 
1920*1080 
33.72 
59.94 
74.176   
HDTV 
9. 
1920*1080 
67.500 
60 
148.50   
HDTV 
10. 
1920*1080 
67.432 
59.94 
148.352   
HDTV 
11. 
1920*1080 
27.000 
24.000 
74.25   
HDTV 
12. 
1920*1080 
26.97 
23.976 
74.176   
HDTV 
13. 
1920*1080 
33.75 
30.000 
74.25   
HDTV 
14. 
1920*1080 
33.71
29.97
74.176   
HDTV 
7. RGB Input (PC)
No Resolution 
H-freq(kHz) V-freq.(kHz)  Pixel 
clock 
Proposed 
PC
DDC
1. 
640*350 
31.468 
70.09 
25.17   
EGA 
X  
2. 
720*400 
31.469 
70.08 
28.32   
DOS 
3. 
640*480 
31.469 
59.94 
25.17   
VESA(VGA) 
O
4 .
800*600 
37.879 
60.31 
40.00   
VESA(SVGA) 
5. 
1024*768 
48.363 
60.00 
65.00   
VESA(XGA) 
6. 
1280*768 
47.776 
59.87 
79.50   
CVT(WXGA) 
7. 1360*768 
47.712 
60.015 
85.50 
 
VESA(WXGA) 
X
8. 
1280*1024 
63.981 60.020 108.00 
 
 
VESA(SXGA)
9. 
1600*1200 
75.00 
60.00 
162   
VESA(UXGA)
O
10. 
1920*1080 
66.587 
59.934 
148.5   
HDTV 1080P
O
- 8 -
8. HDMI input (PC/DTV)
No Resolution 
H-freq(kHz) V-freq.(kHz)  Pixel 
clock 
Proposed 
PC
DDC
1. 
640*350 
31.468 
70.09 
25.17   
EGA 
X  
2. 
720*400 
31.469 
70.08 
28.32   
DOS 
3. 
640*480 
31.469 
59.94 
25.17   
VESA(VGA) 
O
4 .
800*600 
37.879 
60.31 
40.00   
VESA(SVGA) 
5. 
1024*768 
48.363 
60.00 
65.00   
VESA(XGA) 
6. 
1280*768 
47.776 
59.870 
79.50   
CVT(WXGA) 
7. 1360*768 
47.712 
60.015 
85.50 
 
VESA(WXGA) 
X
8. 
1280*1024 
63.981 60.020 108.00 
 
 
VESA(SXGA)
9. 
1600*1200 
75.00 
60.00 
162   
VESA(UXGA)
O
10. 
1920*1080 
67.5 
60 
148.5   
HDTV 1080P
O
DTV
720*480 
31.5 
60 
27.027   
SDTV 480P 
720*480 
31.47 
59.94 
27.00   
SDTV 480P 
1280*720 
45.00 
60.00 
74.25   
HDTV 720P 
1280*720 
44.96 
59.94 
74.176   
HDTV 720P 
1920*1080 
33.75 
60.00 
74.25   
HDTV 1080I 
1920*1080 
33.72 
59.94 
74.176   
HDTV 1080I 
1920*1080 
67.500 
60 
148.50   
HDTV 1080P 
1920*1080 
67.432 
59.939 
148.352   
HDTV 1080P 
1920*1080 
27.000 
24.000 
74.25   
HDTV 1080P 
10 
1920*1080 
26.97 
23.976 
74.176   
HDTV 1080P 
11 
1920*1080 
33.75 
30.000 
74.25   
HDTV 1080P 
12 
1920*1080 
33.71
29.97 
74.176   
HDTV 1080P 
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