Technical description and composition of the BBK LT2008S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT2008S
Panel: 20 inch
Inverter (backlight): BL2006001
PWM Inverter: BIT3106A (30)
MOSFET Inverter: AO4411 (8), AO4404 (8)
Power Supply (PSU): 52008-2 ver: L050818 V2.2
PWM Power: TOP249 (7)
MainBoard: 11703K-0
IC MainBoard: 92TL95D7T1 STV8216 L4950TS
Tuner: JS-6B2 / 121
Control: LT2008S approach LT117-02
Technical specifications LT2008S
BBK LT2008S
General recommendations for repairing TV LCD
Possible malfunctions
- The BBK LT2008S TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
In most of these cases, the 52008-2 main switching power supply is faulty. It is necessary to measure the secondary output supply voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip TOP249 (7) can also be the cause of a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 11703K-0 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). When repairing an MB board, you must check its components 92TL95D7T1 STV8216 L4950TS. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the method of local heating of the chip.
Before changing the tuner JS-6B2 / 121, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Main features of the BBK LT2008S device:
Installed matrix (LCD-panel) 20 inches.
The BL2006001 inverter is used to power the backlight lamps; it is controlled by the BIT3106A PWM controller (30). As power elements of the inverter, keys of the type AO4411 (8), AO4404 (8) are used.
The necessary supply voltages for all nodes of the BBK LT2008S TV are generated by the 52008-2 power module or its analogs using TOP249 microcircuits (7).
MainBoard - the main board (motherboard) is a 11703K-0 module, using 92TL95D7T1 STV8216 L4950TS chips and others.
The JS-6B2 / 121 tuner provides television reception and channel tuning.
BBK LT2008S LCD TV with 20 ”LCD, 20” diagonal 4: 3 format. Screen brightness of 500 cd / m² is ensured by backlighting with 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 analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs 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: 620x450x202 mm.
TV Weight: 9.8 kg.
Attention! The 20-inch panel of the BBK LT2008S LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!