Technical description and composition of the SHARP LC-37P70E TV, panel type and applicable modules. The composition of the modules.SHARP
Model: LC-37P70E
Chassis / Version: SE00LC26P7000
Panel: LK370P3LZ10Z
T-CON: CPWBX3333TPZ
Inverter (backlight): RUNTKA216WJZZ - IM3826-1 - INV1 / RUNTKA217WJZZ - IM3826-2 - INV2
Power Supply (PSU): DUNTKD605 FM03
MainBoard: XD890WJN3, DUNTKD604WE (KD603WE06) KALEX3K688, KD628WE08
IC MainBoard: VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64
Tuner: DUNTKD609WE - KU3270EH - QPWBND609WJN2 // DUNTKD609WE (UV1316 / A I-4)
Control: RRMCGA460WJSA Remote Control Unit, IR: QPWBFD607WJN1
Technical Specifications LC-37P70E
SHARP LC-37P70E
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the SHARP LC-37P70E TV with a careful external examination of internal and external elements, including case parts, a display, buttons and cables. Sometimes, only by some signs can we determine the further direction of the localization of the malfunction. 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 TV does not turn on, no indicators on its front panel are lit or blinking. Also, if the TV does not respond to the remote control and buttons, does not make any sounds or any signs of operability when it is turned on, there is a certain probability that the DUNTKD605FM03 power supply module is defective and needs repair. Sometimes with similar manifestations a problem can only occur in the absence of processor power, but this happens much less often. In this case, the diagnosis and repair of the common power supply should always be started by checking the mains fuse. When it breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor.
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.
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.
If there is no image when you turn on the SHARP LC-37P70E, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Diagnostics of the inverter can be difficult due to the operation of the protection, 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 depressurization. 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.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Repair of the DUNTKD603FM06 motherboard must begin with the diagnosis and verification of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Malfunction of the tuner CKITKD609FM01 is established after checking the software and all the supply voltages at its terminals, including the varicap supply voltage (30-33V).
It should be remembered! Attempts to repair the SHARP LC-37P70E 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 / schematic diagram -------------------> Sharp LC-26P70EE, LC-26P70EF, LC-26P70EI, LC-26P70EK, LC-26P70ERU, LC-32P70EE, LC-32P70EF, LC-32P70EI, LC-32P70EK, LC-32P70ERU, LC-37P70EE, LC-37P70EF, LC-37P70EI, LC-37P70EK, LC-37P70ERU
LC-26P70EE, LC-26P70EF, LC-26P70EI, LC-26P70EK, LC-26P70ERU, LC-32P70EE, LC-32P70EF, LC-32P70EI, LC-32P70EK, LC-32P70ERU, LC-37P70EE, LC-37P70EF, LC-37P70EI, LC-37P70EK, LC-37P70ERU.
The appearance of the MainBoard XD890WJN3 is shown in the figure below:XD890WJN3
XD890WJN3 can be used in TVs:
SHARP LC-37P70E (Panel LK370P3LZ10Z), SHARP LC-37SV1RU (Panel LK370T3LZ5BX), SHARP LC-42SD1RU (Panel T420XW01 V.7), SHARP LC-32SV1RU (Panel LK315T3LF14).
The appearance of the power supply
Main features of the SHARP LC-37P70E device:
Installed matrix (LCD panel) LK370P3LZ10Z.
The matrix control uses the Timing Controller (T-CON) CPWBX3333TPZ.
RUNTKA216WJZZ inverter is used to power the backlight.
The necessary supply voltages for all nodes of the SHARP LC-37P70E TV are generated by the DUNTKD605 power module, or its analogs.
MainBoard - the main board (motherboard) is an XD890WJN3 module, using VCT 6973G B3 000 (B3), LPM240T100G5N, DFN9M0637A (B823), SIL9023CTU, 24LC64 and others.
Tuner DUNTKD609WE - KU3270EH - QPWBND609WJN2 // DUNTKD609WE (UV1316 / A I-4) provides the reception of television programs and tuning to channels.
LCD TV SHARP LC-37P70E with LCD LK370P3LZ10Z, 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 800: 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 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), AV, audio x3, S-Video, SCART x2, RGB, VGA, HDMI, 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.
A digital tuner is capable of receiving television channels in DVB-T standards.
Overall dimensions: with stand 926x705x304 mm, without stand 926x644x119 mm.
TV Weight: with stand: 23 kg, without stand: 20.5 kg.
Attention! The LK370P3LZ10Z panel of an SHARP LC-37P70E 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!