Technical description and composition of the BBK LT2202S TV, type of panel and applicable modules. The composition of the modules.BBK
Model: LT2202S
Chassis / Version: CV7050LA
Panel: M216H1-P01
Inverter (backlight): LK-P190414CE
PWM Inverter: BIT3713 (16)
MOSFET Inverter: AO4606 (8)
Trans Inverter: LKT-001 CFD 1005
Power Supply (PSU): LK-PL90414CE
PWM Power: GR8878 (8)
Mainboard: CV7050LA
IC MainBoard: SPV7050P, Spi Flash: 25T80, Eeprom: 24C32, SOUND: TDA1517P;
Tuner: F21WT-3BAR-E
Control: RC1902
Technical Specifications LT2202S
BBK LT2202S
General recommendations for repairing TV LCD
Possible malfunctions
- BBK LT2202S TV does not turn on at all. There is no reaction to the remote control or to the control buttons from the front panel. Indicator lights do not light or flash.
In such cases, the fault should be sought first in the LK-PL90414CE power supply module. It is necessary to measure its secondary output 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 main fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM GR8878 (8). It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. 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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the CV7050LA 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). In cases of complex repairs of MB (SSB) and with the necessary skills and equipment, sometimes it may be necessary to replace its chips SPV7050P, Spi Flash: 25T80, Eeprom: 24C32, SOUND: TDA1517P; and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the F21WT-3BAR-E tuner, if there is no tuning for 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
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.
Service Manual with Schematic Diagram --------------> BBK LT1902S, LT2202S
The appearance of the MainBoard CV7050LA is shown in the figure below:CV7050LA
CV7050LA can be used in TVs:
BBK LT1902S (Panel M190A1-P0A), BBK LT2202S (Panel M216H1-P01), BBK LT2428HD (Panel V236H1-P01 HK236WLCM-CH03H), BBK LT2428S (Panel V236H1-P01), FUSION FLTV-19W6 (Panel M190A1-P0A), IZUMI TL26H615B (Panel M260TWR1).
Main features of the BBK LT2202S device:
Installed matrix (LCD panel) M216H1-P01.
To power the backlight, an inverter LK-P190414CE is used, it is controlled by the BIT3713 PWM controller (16). A transformer LKT-001 CFD 1005 is installed in the inverter converter. AO4606 type switches (8) are used as power elements of the inverter.
The necessary supply voltages for all nodes of the BBK LT2202S TV are generated by the power module LK-PL90414CE, or its analogs using GR8878 microcircuits (8).
MainBoard - the main board (motherboard) is a CV7050LA module, using microchips SPV7050P, Spi Flash: 25T80, Eeprom: 24C32, SOUND: TDA1517P; and others.
The F21WT-3BAR-E tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: M216H1-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 21.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 477.504x268.596 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 5.2% (with Polarizer)
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Brand: BBK, Model: LT2202S.
Shortly from the TV: LCD, 720p HD, diagonal 22 "(55 cm), there is HDMI.
The composition uses MainBoard CV7050LA and an LCD panel (matrix) M216H1-P01.
Power Supply Unit (PSU) LK-PL90414CE Power Supply.
BBK LT2202S LCD TV with M216H1-P01 LCD, 22 "(55 cm) diagonal display in 16: 9 format. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. Maximum brightness to minimum ratio (contrast) ) is 800: 1. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standard ah 480i, 480p, 576i, 576p, 720p, 1080i. Stereo sound is realized by two built-in speakers. Use audio NICAM STEREO processing system.
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, HDMI. 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, 1024x768, 1360x768.
The power consumed by the TV in the operating mode from the network is 60 watts.
Overall dimensions: With stand 485x400x177 mm, Without stand 390x290x74 mm.
Attention! The BBK LT2202S LCD TV panel M216H1-P01 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!