Technical description and composition of the TV SHARP LC-20SH1EA, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-20SH1EA LC-20SH1E
Chassis / Version: LC-20SH1E
Panel: LQ197V3GZ83
T-CON: KD290 01 XD290WJN1 (2)
Inverter (backlight): QPWBFD282WJN2 DUNTKD282WE 5lamp
MOSFET Inverter: UPA606T
Trans Inverter: ZA075WJ
Power Supply (PSU): QPWBFD283WJN2 DUNTKD283WE
PWM Power: STR-W67652E
MainBoard: 1736DS059918
IC MainBoard: IXB219WJ, IXA370WJ, M24C64WN, AN17821A
Tuner: 1Y5ED501
Technical Specifications LC-20SH1E
SHARP LC-20SH1EA
General recommendations for repairing TV LCD
Like any other TV, SHARP LC-20SH1Ea repair is advisable to start with an external inspection of the visible changes in the external and internal elements. Sometimes, only by some signs can we determine the further direction of the localization of the malfunction. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
If the power supply module QPWBFD283WJN2 DUNTKD283WE fails, the external manifestations may be different, for example, the SHARP LC-20SH1Ea does not turn on at all and there is no indication of the indicator lights on the front panel. If the mains fuse is cut off in the power supply, in most cases a breakdown of the C5886 power switch is detected, which can be integrated with a PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
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.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the SHARP LC-20SH1Ea TV does not have an image, but there is sound, the malfunction should be sought in the power converter of the backlight (inverter). It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
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.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
Attention to users! Self-repair of the SHARP LC-20SH1Ea TV without the appropriate qualifications and experience can lead to its complete non-repairability!
schematic / manual -------------------> Sharp LC-20SH1E
schematic / manual -------------------> Sharp LCD-20SH1A, Sharp LCD-20SH2A, Sharp LCD-20SH4A
Main features of the SHARP LC-20SH1EA device:
Installed matrix (LCD panel) LQ197V3GZ83.
The matrix control uses the Timing Controller (T-CON) KD290.
To power the backlight used inverter QPWBFD282WJN2. 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-20SH1EA TV are generated by the QPWBFD283WJN2 power supply module or its analogs using STR-W67652E microcircuits.
MainBoard - the main board (motherboard) is a module 1736DS059918, using chips IXB219WJ, IXA370WJ, M24C64WN, AN17821A and others.
The 1Y5ED501 tuner provides TV reception and channel tuning.
LCD TV SHARP LC-20SH1E with LCD LQ197V3GZ83, diagonal size 20 "4: 3 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 500: 1. The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation takes place in the standards 480i, 480p, 576i, 576p.
The power of the speaker system of sound 4 W (2x2.1W) 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), AV, S-Video, SCART, RGB. An output for connecting headphones is provided.
Overall dimensions: with stand 480x418x175 mm, without stand 480x427x85 mm.
Mass of the TV: without stand: 6.3 kg.
Attention! The LQ197V3GZ83 panel of the SHARP LC-20SH1E 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!