Technical description and composition of the BBK LT2004S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT2004S Ver1
Panel: M201P1-P03 PV201TVM C02H
Inverter (backlight): PP81C30307B
Power Supply (PSU): PP81C30307B
PWM Power: 1207 (8)
MainBoard: xxx0-000-MS97885-S3H
Tuner: JS-6H2 / 121, PTD2U10107B, PUFT200107A
BBK
Model: LT2004S Ver2
Panel: M201P1-P03 PV201TVM C02H
T-CON: M201P1-P03
Inverter (backlight): integrated into PSU
PWM Inverter: 4501GSD
Trans Inverter: 730-703-220DTLTAH
Power Supply (PSU): P01-AB0-190DTLTDSH 45-860-AB0-190DTLTD
PWM Power: LD7575 (PWM flyback), NCP1377 (PWM flyback 8pin)
MOSFET Power: 40P03-2 (P-channel)
MainBoard: P03-AP ... DK2092TP1H 45899-APO DK2092TP1H
IC MainBoard: CMO0735 WM8521HS EM638165TS-6G
Tuner: JS-6H2 / 121 43899-COO-AF2294UP1H
Technical specifications LT2004S
BBK LT2004S
General recommendations for repairing TV LCD
Possible malfunctions
- BBK LT2004S TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
Failure in such cases should be sought in the power supply circuits P01-AB0-190DTLTDSH. It is necessary to measure its secondary output voltages, and if they are absent, check the health of the power switches (40P03-2 (P-channel)) 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.
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 key may be PWM (PWM) LD7575 (PWM flyback), NCP1377 (PWM flyback 8pin). It is checked only by replacement with a known good one.
- 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.
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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the P03-AP motherboard ... should start by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CMO0735 WM8521HS EM638165TS-6G with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner JS-6H2 / 121 43899-COO-AF2294UP1H may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
It should be remembered! Attempts to independently repair the BBK LT2004S 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!
Service Manual with Schematic Diagram BBK --------------> LT2004S
Service Manual with Schematic Diagram --------------> BBK LT1504S, LT1904S, LT2004S (DK1594-TP0)
Service Manual with Schematic Diagram 37 pages 2006 on model LT2004S
Main features of the BBK LT2004S device:Installed matrix (LCD panel) M201P1-P03 PV201TVM C02H.
The matrix control uses the Timing Controller (T-CON) M201P1-P03.
To power the backlight, a converter is used, combined with a power supply, controlled by a 4501GSD PWM controller. A transformer 730-703-220DTLTAH is installed in the inverter converter.
The necessary supply voltages for all nodes of the TV BBK LT2004S are generated by the power module P01-AB0-190DTLTDSH, or its analogs using microcircuits LD7575 (PWM flyback), NCP1377 (PWM flyback 8pin) and power switches type 40P03-2 (P-channel).
MainBoard - the main board (motherboard) is a P03-AP ... module, using CMO0735 WM8521HS EM638165TS-6G chips and others.
The tuner JS-6H2 / 121 43899-COO-AF2294UP1H provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: M201P1-P03
Type: a-Si TFT-LCD, CELL
Diagonal size: 20.1 inch
Resolution: 1400x1050, SXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 408.24x306.18 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Glass Depth: 0.70 + 0.70 mm
Transmissivity: 6.62% (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
BBK LT2004S LCD TV with M201P1-P03 LCD display, diagonal size 20 "in 4: 3 format. 400 cd / m² screen brightness is provided by CCFL (EEFL) fluorescent lamps. The ratio of maximum brightness to minimum (contrast) is 700: 1. It is possible to view images in high quality HD at a resolution of 1400x1050 pixels in the standard of 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 standards 480i , 480p, 576i, 576p, 720p, 1080i.
The power of the acoustic system of sound 6 W (2x3W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, 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 55 watts.
Overall dimensions: 579x441x185 mm.
TV Weight: 6.8 kg.
Attention! The BB201 LT2004S LCD TV panel M201P1-P03 PV201TVM C02H is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
