Technical description and composition of the BBK LT2614S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT2614S
Panel: V260B1-L02 // V260B1-L01
T-CON: RSAG7.820.1330 / ROH VER.C, CM1671A-KQ, 24C08AN
Inverter (backlight): integrated into PSU
PWM Inverter: FAN7313
Trans Inverter: BCQ-EEA17-HA
Power Supply (PSU): HLP-20A11, RSAG7.820.1235 / ROH
PWM Power: FAN7602, FAN7530 (PFC), FAN7382
MainBoard: RSAG7.820.1037 / ROH VER.C
IC MainBoard: HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, 24C02BI, AP1520, F7314, LM833, TPA3101D2,
Tuner: TDQ-6FT / W126ROH
Control: IR: RSAG7.820.1213 / ROH VER.D
Technical Specifications LT2614S
BBK LT2614S
General recommendations for repairing TV LCD
Possible manifestations of defects
- BBK LT2614S 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.
In most of these cases, the HLP-20A11 main switching power supply is faulty. 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 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 FAN7602, FAN7530 (PFC), FAN7382 can also cause a malfunction of the power switch of the converter and is checked by replacement.
- 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.
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 during work, 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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the RSAG7.820.1037 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, 24C02BI, AP1520, F7314, LM833, TPA3101D2, and replace the failed chips with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Before changing the tuner TDQ-6FT / W126ROH, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on 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
Owners and users of the BBK LT2614S TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
schematic diagram -------------> BBK LT2614, BBK LT3214 Chassis M-STAR
Service Manual with Schematic Diagram 42 pages 2006 on model LT2614S, LT3214S
The appearance of the MainBoard RSAG7.820.1037 is shown in the figure below:RSAG7.820.1037
RSAG7.820.1037 can be used in TVs:
BBK LT2614S (Panel V260B1-L02), BBK LT3214S (Panel LC320W01 (SL)(A1)), BBK LT4214S (Panel LC420WX7 Sl A1), BBK LT3215S (Panel LC320WX3 (SL)(C1)), BBK LT4014S (Panel LTA400WT-L17), DAEWOO DLP-26H1C (Panel V260B1-L02).
PSU Advanced
The LT2614S model uses the HLP-20A11 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the FAN7530 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the BBK LT2614S device:
Installed matrix (LCD panel) V260B1-L02 or V260B1-L01.
The matrix control uses the Timing Controller (T-CON) RSAG7.820.1330.
To power the backlight, a converter is used, combined with the power supply, controlled by the FAN7313 PWM controller. A transformer BCQ-EEA17-HA is installed in the inverter converter.
The necessary supply voltages for all nodes of the TV BBK LT2614S are generated by the HLP-20A11 power module, or its analogs using FAN7602, FAN7530 (PFC), FAN7382 microcircuits.
MainBoard - the main board (motherboard) is an RSAG7.820.1037 module using HY50V281622FTP-5, A25L40PUO, 24C32AN, TMDS341A, 24C02BI, AP1520, F7314, LM833, TPA3101D2, and others microcircuits.
The TDQ-6FT / W126ROH tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V260B1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.2M (6-bit + FRC), CIE1931 72%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: RSDS (1 Channel), 45 pins
Voltage: 5.3.3 / 5.0V (VDD / VIN5)
BBK LT2614S LCD TV with V260B1-L02 LCD, 26 "(66 cm) diagonal size 16: 9 format. 500 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lights. 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.
The power of the sound system 12 W (2x6 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, component, SCART x2, RGB, VGA, HDMI x2. 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.
The power consumed by the TV in the operating mode from the network is 140 watts.
Overall dimensions: 676x544x208 mm.
Mass of the TV: 12.8 kg.
Attention! The BBK LT2614S LCD TV panel V260B1-L02 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!