Technical description and composition of the BBK LT2003S TV, type of panel and applicable modules. The composition of the modules.BBK
Model: LT2003S
Panel: A201SN02 V2
T-CON: A2CSN01 V5 P / N: 48.20A01.014 03A08-1B; UPS121A, L32445K, 9743A, 5420CRZ
Inverter (backlight): BL2006001
PWM Inverter: BIT3106A
MOSFET Inverter: AO4404, AO4411
Trans Inverter: ST1114WH
Power Supply (PSU): Adapter 12V 5A
MainBoard: 11703SRU-4 and 21703-2
IC MainBoard: RTD2020, 24C16, 39VF512-70-4C-NH, 74LVC14AD, ET-TVT0310A-Q, TDA1308, TVP5146M1, STV8216, L4950TS
Tuner: JS-6B2 / 121
Control: LT2003S
Technical specifications LT2003S
BBK LT2003S
General recommendations for repairing TV LCD
Any repair usually begins with an external inspection. It often happens that visible damage to elements or connections helps determine the direction of the troubleshooting. Electrolytic capacitors of filters with a swollen casing, as well as ring cracks formed in the soldered leads of heating elements, or a layer of coal on burnt resistors sometimes tell the repairman the causes of the malfunction and possible consequences.
If the BBK LT2003S does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the adapter 12V 5A power module. In some cases, only the processor power regulator may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller, which can only be checked replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If there is no image when you turn on the BBK LT2003S, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit. It is necessary to take into account that in cases of inverter protection shutdown (in order to be able to diagnose) there is a risk of failure of the inverter power elements and take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
The motherboard 21703-2 and 11703SRU-4 must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary. In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - RTD2020, 24C16, 39VF512-70-4C-NH, 74LVC14AD, ET-TVT0310A-Q, TDA1308, TVP5146M1, STV8216, L4950TS which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before replacing the JS-6B2 / 121 tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Attention to users! Self-repair of the BBK LT2003S TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service Manual with Schematic Diagram 60 pages 2005 on model LT1703S, LT2003S
The appearance of the MainBoard 11703SRU-4 is shown in the figure below:11703SRU-4
Main features of the BBK LT2003S device:
Installed matrix (LCD panel) A201SN02 V2.
The matrix control uses the Timing Controller (T-CON) A2CSN01.
The BL2006001 inverter is used to power the backlight lamps, it is controlled by the BIT3106A PWM controller. The transformer ST1114WH is installed in the inverter converter. As power elements of the inverter, keys of the type AO4404, AO4411 are used.
To power all the internal nodes of the BBK LT2003S TV, an external adapter type 12V 12V 5A is used.
MainBoard - the main board (motherboard) is a module 11703SRU-4, using chips RTD2020, 24C16, 39VF512-70-4C-NH, 74LVC14AD, ET-TVT0310A-Q, TDA1308, TVP5146M1, STV8216, L4950TS and others.
The JS-6B2 / 121 tuner provides television reception and channel tuning.
Information from an alternative source:
BBK LT2003S
Panel Type (Matrix): A201SN02 V2
Motherboard:21703-2 & 11703SRU-4, RTD2020, 24C16, 24LC21A, 39VF512-70-4C-NH, 74LVC14AD, ET-TVT0310A-Q, TDA1308, TVP5146M1, STV8216, L4950TS, Tuner: JS-6B2/121,
T-con: A2CSN01 V5 P/N:48.20A01.014 03A08-1B, UPS121A, L32445K х3, 9743A, 5420CRZ
Invertor: BL2006001, BIT3106A, AO4404, AO4411, Tr-r: ST1114WH x6, POWER: DC 12V; 5A
Remote control: LT2003S Schematic, Schematic
Additional technical information about the panel:
Brand: AUO
Model: A201SN02 V2
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 800x600, SVGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Hard coating, Antireflection
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 5/11 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V
BBK LT2003S LCD TV with A201SN02 LCD, diagonal size 20 ", 4: 3 format. Screen brightness of 500 cd / m² is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 500: 1. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p. Stereo sound is realized by two built-in speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, S-Video, SCART, RGB, VGA. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600.
The power consumed by the TV in the operating mode from the network is 60 watts.
Overall dimensions: 504x489x194 mm.
TV Weight: 10.3 kg.
Attention! The BB201 LT2003S LCD TV panel A201SN02 V2 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!