Technical description and composition of the TV SHARP LC-19S7RU-BK, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-19S7RU-BK
Panel: M185B1-L01
Inverter (backlight): integrated into PSU
Trans Inverter: 806L 19T-933-H
Power Supply (PSU): 715G3521-2
MainBoard: 715G3280-2 // 715G3280-2A
IC MainBoard: CPU: WT6703F, MST9A885GL-LF, EEPROM: 24C32, Spi Flash: MX25L1605
Tuner: TAFT-S710D
Technical Specifications LC-19S7
SHARP LC-19S7RU-BK
General recommendations for repairing TV LCD
Repair of the SHARP LC-19S7RU-BK TV is best started with a thorough external inspection and diagnosis of the malfunction. It is advisable to carefully examine the internal and external components. Sometimes, only by some signs can we determine the further direction of the localization of the malfunction. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
In the absence of any signs of operability, when the SHARP LC-19S7RU-BK does not turn on and does not signal anything with the control lights on the panel, the power module is most likely faulty. When diagnosing and repairing the power supply, first of all, it is necessary to check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power switch.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason, and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the SHARP LC-19S7RU-BK does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
Diagnosis and repair of the inverter is often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to localize a defect, its blocking is required.
In these cases, special care must be taken in view of the risk of failure of the power elements. After completing all repair work, it is imperative to restore the protection circuits for full and safe further operation of the TV by the user.
Attention to the owners! Attempts at self-repair of the SHARP LC-19S7RU-BK TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual / schematic diagram --------------------> Sharp LC-19S7E-BK, LC-26S7E-BK, LC-32S7E-BK
Service Manual with Schematic Diagram 193 year 2008 models LC-19S7E-BK, LC-26S7E-BK, LC-32S7E-BK.
The appearance of the MainBoard 715G3280-2 is shown in the figure below:715G3280-2
The appearance of the power supply
Main features of the SHARP LC-19S7RU-BK device:
Installed matrix (LCD panel) M185B1-L01.
To power the backlight, a converter is used, combined with a power supply. The transformer 806L 19T-933-H is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the SHARP LC-19S7RU-BK TV is carried out by the power supply module 715G3521-2, or its analogs.
MainBoard - the main board (motherboard) is a 715G3280-2 module using CPU chips: WT6703F, MST9A885GL-LF, EEPROM: 24C32, Spi Flash: MX25L1605 and others.
The TAFT-S710D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: M185B1-L01
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV SHARP LC-19S7 with LCD M185B1-L01, diagonal size 19 "(48 cm) 16: 9 format. The brightness of the screen 300 cd / m² is organized by fluorescent lights CCFL (EEFL). Contrast, as the ratio of the maximum brightness to the minimum, not less than 1000: 1.
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 acoustic system of sound 6 W (2x3 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, 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 from the network in operating mode is 45 watts.
Overall dimensions: with stand 457x343x190 mm, without stand 457x308x67 mm.
TV Weight: 4 kg.
In some cases, before calling the repair service, you should make sure that your TV is really defective.
Attention! The SHARP LC-19S7 LCD TV panel M185B1-L01 is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
If the SHARP LC-19S7 does not turn on or is periodically turned off, it is useful to check the sockets and extension cords at the points where the TV is connected to the network, for example, using an ordinary table lamp.
If the SHARP LC-19S7 does not respond to the remote, but the control buttons on the panel work, there is a certain probability of a malfunction of the remote (the remote does not work). It is advisable to check or replace the batteries in it.
If, when watching broadcasting programs, a notification of the absence of a signal appears (no signal), you should make sure that the TV is in the TV reception mode (digital / analog), or check the antenna or cable equipment.
You can check the operation of the TV from other external devices.
If there is no sound only when watching analog television programs, you should check the sound system in the settings. For Russia, D / K (6.5 MHz), for European countries B / G (5.5 MHz). In modern TVs, a region is usually chosen to set the color and sound standards - for “East Europe” (Eastern Europe).
If SHARP LC-19S7 hangs during operation, does not respond to either the remote control or the buttons on the control panel, rebooting sometimes helps. To do this, you must completely disconnect the TV from the network by pulling the plug from the outlet, and turn it back on after 10-15 seconds.