Technical description and composition of the TV SHARP LC-32S7RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-32S7RU LC-32S7E
Panel: LK315T3LZ94
T-CON: CPWBX3919TP; BD8162EKV, 4256WP
Inverter (backlight): T87I029.26
Power Supply (PSU): 715G3467-3
PWM Power: L6599D, TNY277, FAN6961
MOSFET Power: 2SK4097
MainBoard: 715G3285-2
IC MainBoard: MST9A885GL-LF; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR
Tuner: TAFT-5710D
Control: IR: 715G3542-1 IRPF9PB4
Technical Specifications LC-32S7RU
SHARP LC-32S7RU
General recommendations for repairing TV LCD
Possible manifestations of defects
- SHARP LC-32S7RU does not turn on and does not show any signs of operability. Does not blink indicators and does not respond to any control buttons.
With such manifestations, a malfunction is most likely to be detected in the 715G3467-3 power supply module. It is necessary to measure the secondary output voltage, and in case of their absence, check the operability of the power switches (2SK4097) 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 power 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 L6599D, TNY277 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, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a 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, 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 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 715G3285-2 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). When repairing an MB board, you must check its components MST9A885GL-LF; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before changing the tuner TAFT-5710D, if it is not possible to tune to television channels, you should make sure that there are supply voltages that must be measured at 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
We recommend the owners of the LC-32S7RU TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual / schematic diagram --------------> Sharp LC-19S7E-BK, LC-26S7E-BK, LC-32S7E-BK
The appearance of the MainBoard 715G3285-2 is shown in the figure below:
715G3285-2
The appearance of the power supply
Main features of the SHARP LC-32S7RU device:
Installed matrix (LCD panel) LK315T3LZ94.
The matrix control uses the Timing Controller (T-CON) CPWBX3919TP ;.
To power the backlight, an inverter T87I029.26 is used.
The necessary supply voltages for all nodes of the SHARP LC-32S7RU TV are generated by the 715G3467-3 power supply module or its analogs using L6599D, TNY277, FAN6961 microchips and 2SK4097 power switches.
MainBoard - the main board (motherboard) is a 715G3285-2 module, using MST9A885GL-LF chips; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR and others.
The TAFT-5710D 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-32S7RU with LCD LK315T3LZ94, diagonal size 32 "(81 cm) 16: 9 format. Brightness of the screen glow 450 cd / m² organized by backlighting with CCFL fluorescent lamps (EEFL). Dynamic contrast 4000: 1 is achieved by control backlighting 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 the standards 480i, 480p, 576i, 576p, 720p, 1080i.
The power of the sound system 10 W (2x5 W) 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), SCART x2, 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 from the network in operating mode is 135 watts.
Overall dimensions: with stand 791x570x240 mm, without stand 791x527x99 mm.
Mass of the TV: 12.4 kg.
Attention! The LK315T3LZ94 panel of an SHARP LC-32S7RU LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!