Technical description and composition of the BBK LT1504S TV, panel type and applicable modules. The composition of the modules.BBK
Model: LT1504S
Chassis / Version: MCT
Panel: SVA150XG04TB // SVA150XG10TB
Inverter (backlight): PP25P30107 cm BP // P05-AB0- P150TLTA3H // 730-703-150BTLTA-LH
PWM Inverter: TL494C (16)
MOSFET Inverter: APM4546 (8), 4501GSD
Trans Inverter: 730-703-150BTLTA
Power Supply (PSU): 200-001-XXXXTLTX-AH - 19-860-ABO-P150BTLTA-3H
PWM Power: LD7575PS (PWM flyback)
MOSFET Power: P9N70, D409, D405
MainBoard: 200-100-DK1694P-BH - 200-000-MS97885-S3H
IC MainBoard: MST97885LD / MST96885LD, AT24C32AN, 25L4005AMC, EM638165TS-66, TDA1517P, APA3541, WM8521HCGED
Tuner: JS-6H2 / 121 (TDA6509ATT)
Control: S0701244
Technical Specifications LT1504S
BBK LT1504S
General recommendations for repairing TV LCD
Possible malfunctions
- BBK LT1504S does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
In such cases, the fault should be sought first in the power module 200-001-XXXXTLTX-AH. It is necessary to measure the secondary output voltage, and in case of their absence, check the serviceability of the power switches (P9N70, D409, D405) 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. PWM chip LD7575PS (PWM flyback) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by a power supply module, or by inverter defects, as well as by 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, 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 200-100-DK1694P-BH 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard board - MST97885LD / MST96885LD, AT24C32AN, 25L4005AMC, EM638165TS-66, TDA1517P, APA3541, WM8521HCGED. In cases where the BGA processor is used, its malfunction is usually detected by local heating.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner JS-6H2 / 121 (TDA6509ATT). It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners and users of the BBK LT1504S 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 / MANUAL -------------> LT1504S, LT1904S, LT2004S
SCHEMATIC / MANUAL -------------> BBK LT1504S, LT1904S, LT2004S (DK1594-TP0)
The appearance of the MainBoard 200-100-DK1694P-BH is shown in the figure below:200-100-DK1694P-BH
200-100-DK1694P-BH can be used in TVs:
BBK LT1504S (Panel SVA150XG04TB), BBK LT2209S (Panel PV220WTVM).
The appearance of the power supply
Main features of the BBK LT1504S device:
Installed matrix (LCD panel) SVA150XG04TB or SVA150XG10TB.
The PP25P30107 inverter is used to power the backlight, controlled by the TL494C PWM controller (16). A transformer 730-703-150BTLTA is installed in the inverter converter. As power elements of the inverter, keys of the type APM4546 (8), 4501GSD are used.
The necessary supply voltages for all nodes of the TV BBK LT1504S are generated by the power module 200-001-XXXXTLTX-AH, or its analogs using microcircuits LD7575PS (PWM flyback) and power switches of the type P9N70, D409, D405.
MainBoard - the main board (motherboard) is a 200-100-DK1694P-BH module, using the MST97885LD / MST96885LD, AT24C32AN, 25L4005AMC, EM638165TS-66, TDA1517P, APA3541, WM8521HCGED and other chips.
The tuner JS-6H2 / 121 (TDA6509ATT) provides the reception of television programs and tuning to channels.
Information from an alternative source:
BBK LT1504S / BBK LT1904S, LT2004S, LT2209S (MST)
Motherboard: 200-100-DK1694P-BH, CPU - MST97885LD / MST96885LD (under the heatsink), Memory - AT24C32AN, Flash - 25L4005AMC, SDRAM - EM638165TS-66, Sound - TDA1517P, Tuner - JS-6H2 / 121 (TDA6509AT)
Panel Type (Matrix): SVA150XG04TB, Other ICs - APA3541, WM8521HCGED, Power & Inverter Board - 200-001-XXXXTLTX-AH, SMPS - LD7575PS, TR Chopper - 730-102-150BTLTA
Invertor: 730-703-150BTLTA-LH, Other ICs - 4501GSD, TL494C DIAGRAM BBK LT1504S
Additional technical information about the panel:
Brand: SVA-NEC
Model: SVA150XG04TB
Type: a-Si TFT-LCD, Panel
Diagonal size: 15.0 inch
Resolution: 1024x768, XGA
Display Mode: TN, Normally White, Transmissive
Active Area: 304.128x228.096 mm
Brightness: 250 cd / m²
Contrast Ratio: 450: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 60%
Response Time: 3/9 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 20 pins
Voltage: 3.3V
LCD TV BBK LT1504S with LCD SVA150XG04TB, diagonal size 15 "4: 3 format. The brightness of the screen is 250 cd / m² backlight fluorescent lamps CCFL (EEFL). The ratio of maximum brightness to minimum (contrast) is 450: 1. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p.
The power of the acoustic system of sound 6 W (2x3W) 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 x3, S-Video, component, 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, 1024x768.
The power consumed by the TV in the operating mode from the network is 48 watts.
Overall dimensions: 560x320x160 mm.
TV Weight: 5 kg.
Attention! The BBA LT1504S LCD TV panel SVA150XG04TB is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
The power of the acoustic system of sound 6 W (2x3W) 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 x3, S-Video, component, 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, 1024x768.
The power consumed by the TV in the operating mode from the network is 48 watts.
Overall dimensions: 560x320x160 mm.
TV Weight: 5 kg.
Attention! The BBA LT1504S LCD TV panel SVA150XG04TB is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!