Technical description and composition of the TV SHARP LC-30HV4E, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-30HV4E
Panel: TFT LCD 2949 120 dots (1280 x 768 x 3 dots)
T-CON: KA658DE - XA658CE - DUNTKA658FE19
Inverter (backlight): KB799DE (SB799W1), KB800DE (SB800WJ)
MOSFET Inverter: UPA606T
Trans Inverter: ZA075WJ
Power Supply (PSU): QPWBS0034SNEZ (22) (RDENCA009WJN1)
PWM Power: TNY264, NJM2375AD
MOSFET Power: 2SK2717, 2SK2917
MainBoard: KB157DE XB157WJ (DUNTKB157FE02)
IC MainBoard: 24C08, TA2024
Tuner: VTUVT4T5FD203
Technical Specifications LC-30HV4E
SHARP LC-30HV4E
General recommendations for repairing TV LCD
Possible malfunctions
- The SHARP LC-30HV4E TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
With such manifestations, in some cases, the QPWBS0034SNEZ power module is faulty. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probability in the converters, power switches (2SK2717, 2SK2917) and rectifier diodes.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) TNY264, NJM2375AD, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- 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 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.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required when working, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- 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 KB157DE 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). If it is not possible to replace the MB (SSB) card, it is necessary to check the health of its elements - 24C08, TA2024. Defective components should be replaced.
Before replacing the VTUVT4T5FD203 tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
TV users and owners must remember that attempts to self-repair a SHARP LC-30HV4E TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Service manual / schematic diagram --------------> SHARP LC-30HV4E
Main features of the SHARP LC-30HV4E device:Installed matrix (LCD panel) TFT LCD 2949120 dots (1280 x 768 x 3 dots).
The matrix control uses the KA658DE Timing Controller (T-CON).
The KB799DE inverter is used to power the backlight. A transformer ZA075WJ is installed in the inverter converter. As power elements of the inverter, keys of the UPA606T type are used.
The necessary supply voltages for all nodes of the SHARP LC-30HV4E TV are generated by the QPWBS0034SNEZ power supply module or its analogs using TNY264, NJM2375AD microchips and 2SK2717, 2SK2917 power switches.
MainBoard - the main board (motherboard) is a KB157DE module, using 24C08, TA2024 chips and others.
Tuner VTUVT4T5FD203 provides the reception of television programs and tuning to channels.
LCD TV SHARP LC-30HV4E with TFT LCD, diagonal size 30 "format 16: 9. The brightness of the screen 430 cd / m² organized by backlight fluorescent lamps CCFL (EEFL). Contrast, as the ratio of maximum brightness to minimum, not less than 500: 1.
You can view images in high quality HD at a resolution of 1280x768 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 20 W (2x10 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 x2, S-Video, SCART x3, RGB, VGA, 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, 1280x1024.
The power consumed by the TV from the network in operating mode is 141 watts.
Overall dimensions: with stand 1002x608x305 mm, without stand 1002x497x85 mm.
TV Weight: with stand: 19.5 kg, without stand: 15.7 kg.
Attention! The TFT LCD panel 2949120 dots (1280 x 768 x 3 dots) of the SHARP LC-30HV4E 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!