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PDF 32LB9D-AD Data sheet ( Hoja de datos )
| Número de pieza | 32LB9D-AD | |
| Descripción | LCD TV SERVICE MANUAL | |
| Fabricantes | LG | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de 32LB9D-AD (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
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Internal Use Only
website:http://biz.LGservice.com
LCD TV
SERVICE MANUAL
CHASSIS : LB73B
MODEL : 32LB9D 32LB9D-AD
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
1 page  
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.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
-5-
LGE Internal Use Only
5 Page 
5. Adjustment of White Balance
5-1. Required Equipment
(1) Color analyzer : CA-210(CH 9)
- When you adjust LCD color temperature, on color
analyzer (CA-210), you should use Channel 9 which is
Matrix compensated (White, Red, Green, Blue revised)
by CS-1000 and adjust in accordance with White balance
adjustment coordinate which is specified on the next.
(2) Automatic adjustor (with automatic adjustment hour
necessity and the RS-232C communication being possible.
Baud Rate = 115200)
(3) Video Signal Generator MSPG-925F 720p, 216 Gray
(Model : 217, Pattern : 78)
5-2. Measuring device connection diagram
(Automatic Adjustment)
F u l l W h i t e P at t er n
(Inner Pattern)
Color Analyzer
R S-232C
<Fig. 3> Connection diagram for internal pattern
<Fig. 4> Connection diagram for HDMI input
5-3. White Balance adjustment method
Basically it uses the internal pattern but when internal pattern
is not possible, you can select HDMI input for adjustment.
Through the option at the most bottom part of the Ez Adjust
Menu 5.White Balance menu, you can select NONE, INNER,
HDMI, and the default is set to INNER. When the adjustment
cannot be done with the internal pattern, you can select HDMI
input for adjustment.
For manual adjustment, press the ADJ KEY of the adjustment
R/C to enter Ez Adjust 6.White-Balance, and the pattern is
automatically displayed. (When you set the Option to INNER,
the default is always set to INNER)
1) Connect the set according to the internal pattern or HDMI
input in accordance with 5.2 measuring device connection
diagram.
2) Set the Baud Rate of RS-232C to 115200. It is set to
115200 as default.
3) Connect the RS-232C Cable to the set.
4) Connect the HDMI Cable to the set. (Limited to the set with
HDMI option)
5) Select and adjust the model applicable to LB73B chassis
from the adjuster.
Caution) When you adjust automatically, RS-232C Command
is used.
RS-232C Command
[CMD ID DATA]
Remark
wb 00 00 Start white balance adjustment
wb 00 10 Start Gain adjustment(Internal white pattern)
wb 00 1f End Gain adjustment
wb 00 20 Start Offset adjustment (Internal white pattern)
wb 00 2f End Offset adjustment
wb 00 ff End white Balance adjustment (Internal pattern disappear)
Wb 00 00 Start automatic adjustment of white balance
Wb 00 10 Start gain adjustment (Internal pattern)
Ja 00 ff Adjustment data
Jb 00 c0
…
Wb 00 1f End gain adjustment
* Adjust offset as necessary (wb 00 20(Start), wb 00 2f(End))
Wb 00 ff End automatic adjustment of white balance
(Internal pattern disappears)
Caution) Adjustment map
RS-232C COMMAND
[CMD ID DATA] Min
CENTER
(DEFAULT)(Hex)
Max
Cool Mid Warm
Cool Mid Warm
R Gain jg ja jd 00 192 192 192 192
G Gain jh jb je 00 192 192 192 192
B Gain ji jc jf 00 192 192 192 192
R Cut
64 64 64 127
G Cut
64 64 64 127
B Cut
64 64 64 127
* White Balance adjustment (For automatic adjustment)
- Execute Power Only Key of the adjustment R/C to execute
automatic adjustment. Set the Baud Rate to 115200.
- Always start adjustment with “wb 00 00” and end
adjustment with “wb 00 ff”
- Adjust the offset if necessary.
Copyright © 2007 LG Electronics. Inc. All right reserved.
Only for training and service purposes
- 11 -
LGE Internal Use Only
11 Page | ||
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