Technical description and composition of the TV SHARP LC-45GD1E, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-45GD1E
Panel: LK445D3FZA0
T-CON: DUNTKC478UJ03 J TOP LCD CONTROLLER Unit CM // DUNTKC479UJ03 J BOTTOM LCD CONTROLLER Unit BT
Inverter (backlight): KC471 KC472 KC473 KC474
Power Supply (PSU): MPF3903 RDENCA
MainBoard: TU-45GD1E AVC System
Technical Specifications LC-45GD1E
SHARP LC-45GD1E
General recommendations for repairing TV LCD
Like any other TV, it is advisable to start repairing the SHARP LC-45GD1E with an external examination of the visible changes in the external and internal elements. Any external damage can sometimes prompt the repairman to take further steps to determine the malfunction of the TV and localize the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
If the MPF3903 RDENCA power supply module fails, the external manifestations may be different, for example, the SHARP LC-45GD1E does not turn on at all and there is no indication of the indicator lights on the front panel. When diagnosing and repairing the MPF3903 RDENCA power supply, it is first necessary to check the fuse, and if it breaks, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
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-45GD1E 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.
Diagnostics of the KC471 KC472 KC473 KC474 inverter can be difficult due to the protection being triggered, which is organized by the designers to prevent negative consequences or fires in emergency cases, for example, during short circuits or breaks in the lamp power supply circuit, as well as their possible leakage. To make the necessary measurements at control points or take the necessary waveforms, repairmen have to block the protection circuits in order to be able to diagnose.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
It should be remembered! Attempts to repair the SHARP LC-45GD1E TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
Service Manual with Schematic Diagram 88 pages 2004 on model LC-45GD1E
Main features of the SHARP LC-45GD1E device:Installed matrix (LCD panel) LK445D3FZA0.
The matrix control uses the Timing Controller (T-CON) DUNTKC478UJ03.
To power the backlight used inverter KC471.
The formation of the necessary supply voltages for all nodes of the SHARP LC-45GD1E TV is carried out by the MPF3903 power supply module, or its analogues.
MainBoard - the main board (motherboard) is a TU-45GD1E module.
LCD TV SHARP LC-45GD1E with LCD LK445D3FZA0, diagonal size 45 "format 16: 9. The brightness of the screen is 450 cd / m² backlit with fluorescent lamps CCFL (EEFL). Contrast, as the ratio of maximum brightness to minimum, no less than 800: 1.
The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Stereo sound is realized by two built-in speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), S-Video, 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, 1360x768.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: 1072x820x306 mm.
Attention! The LK445D3FZA0 panel of the SHARP LC-45GD1E 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!