Technical description and composition of the BBK LT2007S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT2007S
Chassis / Version: NP2005 / 7
Panel: A201SN02 V.4
Lamp backlight: 6 Lamp CCFL
T-CON: A2CSN01 V5 48.20A01.014 03A08-1B
Inverter (backlight): BL2006001
PWM Inverter: BIT3106A
MOSFET Inverter: AO4411, AO4404
Power Supply (PSU): Adapter 12V
MainBoard: 2D2007-3 NP2005 / 7
IC MainBoard: CPU: MT1389FE
Tuner: 02007-2 (JS-6B2 / 121)
Technical specifications LT2007S
BBK LT2007S
General recommendations for repairing TV LCD
Possible malfunctions
- BBK LT2007S does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Most likely in this case, the main switching power supply (IPS) Adapter is faulty.
The external adapter 12V power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required when working, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the NP2005 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing CPU elements: MT1389FE requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV works properly from external devices, first of all, check the voltage of the tuner 02007-2 (JS-6B2 / 121) and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the BBK LT2007S TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
The appearance of MainBoard 2D2007-3 is shown in the figure below:2D2007-3
Main features of the BBK LT2007S device:
Installed matrix (LCD panel) A201SN02 V.4.
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. As power elements of the inverter, keys of the type AO4411, AO4404 are used.
To power all the internal components of the BBK LT2007S TV, an external adapter 12V type is used.
MainBoard - the main board (motherboard) is a 2D2007-3 module using CPU chips: MT1389FE and others.
Tuner 02007-2 (JS-6B2 / 121) provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: A201SN02 V4
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: Antiglare
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 11/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V
BBK LT2007S 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 occurs in the standards 480i, 480p, 576i, 576p. Supported media file formats: MP3, WMA, MPEG4, VideoCD, SVCD, Picture CD , JPEG.
The power of the sound system 6 W (2x3 W) provide two 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 x2, S-Video, SCART, RGB, VGA, USB. 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.
Overall dimensions: 500x517x202 mm.
TV mass: 12 kg.
Attention! The BB201 LT2007S LCD TV panel A201SN02 V.4 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!