Technical description and composition of the TV SHARP LC-37HV4E, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37HV4E
Panel: RLCDTA018WJZZ
Inverter (backlight): DUNTKB809DE
MOSFET Inverter: UPA606T, 2SC5707
Trans Inverter: ZA018WJ, ZA020WJ
Power Supply (PSU): RDENCA033WJZZ
PWM Power: MC33262
MOSFET Power: 2SK3326
MainBoard: DUNTKB453DE KB453DE XB453WJ DUNTKB453FE04
IC MainBoard: CPU: HD64F3643H, Scaler: XC2S150-5FG256, EEPROM: 24LC01, 24LC02, 24LC08
Control: IR: QPWBSB813WJN1
Technical Specifications LC-37HV4E
SHARP LC-37HV4E
General recommendations for repairing TV LCD
Possible malfunctions
- The SHARP LC-37HV4E TV does not turn on and does not show any sign of turning on, it does not respond to the control buttons or the remote control.
Typically, with such manifestations, the defect is caused by faulty elements in the main power supply module RDENCA033WJZZ. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (2SK3326) and the rectifier diodes of the converters for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the 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, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits of the MC33262 are usually checked by replacing with new ones, or obviously working.
- 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 module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
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 DUNTKB453DE 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). When repairing an MB board, you need to check its CPU components: HD64F3643H, Scaler: XC2S150-5FG256, EEPROM: 24LC01, 24LC02, 24LC08. 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.
We recommend the owners of the LC-37HV4E 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-37HV4E Chassis
Main features of the SHARP LC-37HV4E device:Installed matrix (LCD-panel) RLCDTA018WJZZ.
To power the backlight used inverter DUNTKB809DE. The transformer ZA018WJ, ZA020WJ is installed in the inverter converter. As power elements of the inverter, keys of the type UPA606T, 2SC5707 are used.
The necessary supply voltages for all nodes of the SHARP LC-37HV4E TV are generated by the RDENCA033WJZZ power supply module or its analogs using MC33262 microcircuits and 2SK3326 type power switches.
MainBoard - the main board (motherboard) is a DUNTKB453DE module, using CPU chips: HD64F3643H, Scaler: XC2S150-5FG256, EEPROM: 24LC01, 24LC02, 24LC08 and others.
LCD TV SHARP LC-37HV4E with LCD display RLCDTA018WJZZ, diagonal size 37 "(94 cm) 16: 9 format. The brightness of the screen 430 cd / m² is organized by backlighting with CCFL fluorescent lamps (EEFL). Contrast, as the ratio of maximum brightness to minimum, not less than 800: 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 sound speaker system 20 W (2x10 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), component, DVI HDCP, HDMI. 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.
Overall dimensions: with stand 1184x697x305 mm, without stand 1184x587x88 mm.
TV Weight: with stand: 24 kg, without stand: 19.9 kg.
Attention! The SHARP LC-37HV4E LCD TV panel RLCDTA018WJZZ is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!