BBK LT1902S User manual

2009/10/13 - 1 -
Service Manual
(1906 2206)
HDMI
MST719

2009/10/13 - 2 -
Contents
1. Precautions and Safety Notices…………………………………………………………3
2. Specification…………………………………………………………………………………5
3. Function Control Description…………………………………………………………….10
4. Circuit Description…………………………………………………………………………11
5. Adjusting Procedure………………………………………………………………………17
6. Trouble Shooting Flow Chart……………………………............................................23
7. Block Diagrams…………………………………………………………………………….26

Prior to using this service manual, please ensure that you have carefully followed all the
procedures outlined in the user’s manual for this product.
(1) Read all of these instructions.
(2) Save these instructions.
(3) Follow all warnings and instructions a marked on the product.
(4) Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or
aerosol cleaners, use a damp cloth for cleaning.
(5) Do not use this product near water.
(6) Do not place this product on an unstable cart, stand or table. The product may fall, causing
serious damage to the product.
(7) Slots and openings in the cabinet and the back or bottom are provided for ventilation, to
ensure reliable operation of the product and to protect it from overheating, those openings
must not be blocked or covered. The openings should never be blocked by placing the
product on a bed, sofa, rug, or other similar surface. This product should not be placed in a
built-in installation less proper ventilation is provided.
(8) These products should be operated from the type of power source indicated on the
marketing label. If you are not sure of the type of power available, consult your dealer or
local power company.
(9) This product is equipped with a 3-wire grounding type plug, a plug having a third (grounding)
pin. This plug will only fit into a grounding-type power outlet. This is a safety feature, if you
are unable to insert the plug into the outlet, contact your electrician to replace your obsolete
outlet. Do not defeat the purpose of the grounding-type plug.
(10) Do not allow anything to rest on the power cord. Do not locate this product where persons
will walk on the cord.
(11) If an extension cord is used with this product, make sure that the total of the ampere
ratings on the product plugged into the extension cord to the waplugged into outlet does not
exceed 15 ampere.
(12) Never push objects of any kind into this product through cabinet slots as they may touch
dangerous voltage points or short out parts that could result in a risk of fire or electric shock.
Never spill liquid of any kind on the product.
(13) Do not attempt to service this product yourself, as opening or removing covers may
expose you to dangerous voltage points or other risks. Refer all servicing to service
personnel.
(14) Unplug this product from the wall outlet and refer servicing to qualified service personnel
under the following conditions:
a. When the power cord or plug is damaged or frayed.
b. If liquid has been spilled into the product.
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1. Precautions and Safety Notices

2009/10/13 - 4 -
c. If the product has been exposed to rain or water.
d. If the product does not operate normally, when the operating instructions are followed.
Adjust only those controls that are covered by the operating instructions since improper
adjustment of other controls may result in damage and will often require extension
work by a qualified technician to restore the product to normal operation.
e. If the product has been dropped or the cabinet has been damaged.
f. If the product exhibits a distinct change in performance, indicating a need for service.

2.Specification
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Model No. 19” 22”
Display Pixel 1440 (H) x 900(V) 1680 (H) x 1050(V)
Pixel Pitch 0.285mm (H) x0.285mm (V) 0.282mm (H) x0.282mm (V)
Active Display Area 410.4 (H) x 256.5 (V) 473.76 (H) x 296.1(V)
Pixel Type R+G+B vertical stripe R+G+B vertical stripe
Number of Colors 16.2M 16.7M
View Angle ±85°degree(H), ±80°degree (V)
Typical
±85°degree(H), ±80°degree (V)
Typical
Brightness 300cd/m2 typical 300cd/m2 typical
Contrast Ratio 850:1 typical at CR 10≧700:1 typical at CR 10≧
Brightness Uniformity 75% min. 75% min.
Power Source 100-240V~,50/60Hz,50W 100-240V~,50/60Hz,50W
Power Consumption ＜42W Max with speaker
Standby: ＜1.5W
＜50W Max with speaker
Standby: ＜1.5W
Sound Output 3W ×2 8Ω3W ×2 8Ω
AV/TV Source
Connector types
Inputs &
Outputs
Signals Video Format Video Sound
ANT Main-TV PAL/SECAM PH Type None
VIDEO Video + L/R Audio CVBS RCA x 1 RCA x 2
S-VIDEO S-VIDEO+ L/R Audio Y/C Mini Din 4 Pin RCA x 2
VGA VGA+ L/R Earphone Analog RGB VGA15 Pin Earphone
HDMI HDMI Digital RGB 19 Pin
SCART CVBS/RGB ,Video IN/OUT,
Audio IN/OUT
PAL,NTSC,SECA
M
SCART
connector