Technical description and composition of the TV SHARP LC-37GE1RU, type of panel and applicable modules. The composition of the modules.SHARP
Model: LC-37GE1RU
Panel: CCHSMA310WJ02
Inverter (backlight): RUNTKA244WJZZ (11lamp)
PWM Inverter: 47P06. 50N06
MOSFET Inverter: D2137,
Power Supply (PSU): DUNTKD787WE (DUNTKD787WE02)
PWM Power: FA5501A (PFC), MR4040, MR4020
MOSFET Power: K3525
MainBoard: QPWBND833WJN1
Tuner: KD833
Technical Specifications LC-37GE1RU
SHARP LC-37GE1RU
General recommendations for repairing TV LCD
TV SHARP LC-37GE1RU, like any other, it is advisable to start repairing it by inspecting the internal and external visible physical visual changes. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. 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 cases where the SHARP LC-37GE1RU TV does not turn on, does not respond to the remote control and buttons, no indicators on the front panel light up or blink, and there are no sounds and no signs of operability when turning on, the DUNTKD787WE, 5501A power supply module is most likely faulty (8), or, which is much less common, there is no power to the processor on the motherboard. The diagnostics of the power supply should always be started by checking the fuse and, if it is broken, the first thing to do is to check the rectifier bridge diodes and the K3525 power switch for the possibility of an avalanche or thermal breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with the MR4040 MR4020 PWM controller in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
In cases where the SHARP LC-37GE1RU TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
Repair of the RUNTKA244WJZZ inverter (11lamp) can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
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.
If the motherboard QPWBND833WJN1 is faulty, first of all it is necessary to check all the linear power regulators of its chips and, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the varicaps of the tuner KD833, which is usually within 30-33V, as well as other supply voltages at the terminals of the tuner.
Attention to users! Self-repair of the SHARP LC-37GE1RU TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual / schematic diagram -------------------> Sharp LC-37GE1E
The DUNTKD787WE02 power module is installed on the LC-37GE1RU TV using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The step-up converter based on the 5501A PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the SHARP LC-37GE1RU device:
Installed matrix (LCD panel) CCHSMA310WJ02.
To power the backlight, the RUNTKA244WJZZ inverter is used, controlled by the PWM controller 47P06. 50N06. As power elements of the inverter, keys of the type D2137, are used.
The necessary supply voltages for all nodes of the SHARP LC-37GE1RU TV are generated by the DUNTKD787WE power module or its analogs using FA5501A (PFC), MR4040, MR4020 microchips and K3525 type power switches.
MainBoard - the main board (motherboard) is a QPWBND833WJN1 module.
The KD833 tuner provides TV reception and channel tuning.
LCD TV SHARP LC-37GE1RU with LCD CCHSMA310WJ02, diagonal size 37 "(94 cm) in 16: 9 format. The brightness of the screen is 450 cd / m² by CCFL (EEFL) fluorescent lamps. Contrast as the ratio of maximum brightness to minimum, not less than 1200: 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.
Sound power 30 watts (2x15 watts) provide 6 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 x3, S-Video, SCART x2, RGB, VGA, HDMI x2, 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, 1360x768.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 930x724x304 mm, without stand 930x660x120 mm.
TV Weight: with stand: 28.5 kg, without stand: 23.5 kg.
Attention! The CCHSMA310WJ02 panel of the SHARP LC-37GE1RU 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!