Technical description and composition of the SHARP LC-32SB25 TV, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32SB25 LC-32SB25E
Chassis / Version: WK: 830
Panel: LK315T3LZ94
Lamp backlight: 12 LAMP CCFL
Inverter (backlight): RDENC2540TPZ
PWM Inverter: BD9222FV
Power Supply (PSU): 715T3188-3
PWM Power: SG6961, L6599D, TNY277
MOSFET Power: STW20NM60, STP10NK60ZFP
MainBoard: 715T3251-4 (WK: 830)
IC MainBoard: CPU: MT5362, SPI flash MX25L3205DMI-12G, EEPROM: M24C16WP, AUDIO: MT8292 & TDA8933BTW
Tuner: ENG37E14KF
Technical Specifications LC-32SB25
SHARP LC-32SB25
General recommendations for repairing TV LCD
Possible malfunctions
- The SHARP LC-32SB25 TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Most often, with such manifestations, the 715T3188-3 main power module is found to be faulty. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (STW20NM60, STP10NK60ZFP) and rectifier diodes for possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a 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 the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) SG6961, L6599D, TNY277, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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. If all the electrolytic capacitors of the filter for the power supply of the inverter are working, you should make sure 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, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 715T3251-4 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the CPU elements: MT5362, SPI flash MX25L3205DMI-12G, EEPROM: M24C16WP, AUDIO: MT8292 & TDA8933BTW. BGA chip malfunctions are usually easy to detect by warming up.
If the TV works normally from external devices, but does not tune into television channels, the ENG37E14KF tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. 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.
Attention! Users and owners of LC-32SB25 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual / schematic diagram --------------> SHARP LC-32SB25 Chassis WK:830 2008 MODELS LC-26SB25E, LC-26SB25S, LC-26SB25RU, LC-32SB25E, LC-32SB25S, LC-32SB25RU, LC-42SB55E, LC-42SB55S , LC-42SB55RU
The appearance of the MainBoard 715T3251-4 is shown in the figure below:715T3251-4
The appearance of the power supply
Main features of the SHARP LC-32SB25 device:
Installed matrix (LCD panel) LK315T3LZ94.
The RDENC2540TPZ inverter is used to power the backlight, controlled by the BD9222FV PWM controller.
The necessary supply voltages for all nodes of the SHARP LC-32SB25 television are generated by the 715T3188-3 power supply module or its analogs using SG6961, L6599D, TNY277 microchips and power switches of the STW20NM60, STP10NK60ZFP type.
MainBoard - the main board (motherboard) is a 715T3251-4 module using CPU chips: MT5362, SPI flash MX25L3205DMI-12G, EEPROM: M24C16WP, AUDIO: MT8292 & TDA8933BTW and others.
The ENG37E14KF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: SHARP
Model: LK315T3LZ94
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: ASV, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (2H)
Brightness: 450 cd / m²
Contrast Ratio: 1500: 1
Display Colors: 16.7M (8-bit)
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV SHARP LC-32SB25 with LCD LK315T3LZ94, diagonal size 32 "(81 cm) in 16: 9 format. The brightness of the screen is 450 cd / m² by CCFL (EEFL) fluorescent lamps. Contrast as the ratio of maximum brightness to minimum, not less than 1500: 1. Dynamic contrast ratio of 75000: 1 is achieved by controlling the backlight depending on the brightness of the plot.
You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 10 W (2x5 W) provides 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, audio x3, S-Video, component, SCART x2, RGB, VGA, HDMI x3, RS-232. 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.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 783x562x235 mm, without stand 782x522x95 mm.
TV Weight: with stand: 12.5 kg, without stand: 10.7 kg.
Attention! The SHARP LC-32SB25 LCD TV panel LK315T3LZ94 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!