Technical description and composition of the DNS K47DS712 TV, panel type and modules used. The composition of the modules.DNS LED
Model: K47DS712 DNSK47DS712
Chassis / Version: KDL47XS712AN-LCD-KD3
Panel: K470B1LED3
T-CON: LC470DUE-SFR1 6870C-0444A
LED driver (backlight): 35017884
PWM LED driver: iW7018-0, AP3041M-G1
MOSFET LED driver: MBR20150CT, FDD86252
Power Supply (PSU): KPS-L110C3 (-01) 34008454
PWM Power: FSL206MR, FAN7930, LM358L
MOSFET Power: UK3568L
MainBoard: 35017328 KDL47XS712AN-LCD-KD3
IC MainBoard: THGBM5G5A1JBAIR, 25Q16BV, GL852GC, MSH9010-LF
Tuner: NXP18273
Specifications K47DS712
DNS K47DS712
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- DNS K47DS712 does not turn on and does not show any signs of operability at all. Does not blink indicators and does not respond to control buttons.
With similar manifestations, in some cases, the KPS-L110C3 power supply module is faulty. It is necessary to make sure that its output voltages are present and, if they are completely absent, check the power switches (UK3568L) and rectifier diodes for a possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in an emergency mode of short circuit without output voltages, and in case of a short circuit in the power elements of the primary circuit, the mains fuse and / or the current sensor in the source of the key usually breaks off.
Breakdown of power switches (MosFet) in switching sources is sometimes caused by malfunctions of other circuit elements, for example, in the circuits supplying the PWM controller, frequency setting or damper, as well as in the circuits of Negative Feedback (OOS) stabilization. PWM controllers (PWM) FSL206MR, FAN7930, LM358L, if they have no visible damage to the case and an outright short circuit between the terminals, are usually checked by replacing.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
The malfunction in most of these cases is found in the nodes and elements of the LED panel backlight. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When diagnosing, it must be borne in mind that it is impossible to check for an open in the circuit of the LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally a current source. By opening the panel, you can check each LED separately. Typically, Chinese multimeters will lightly light one 3-volt LED if you connect the probes to it in the forward direction. For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of LED health. In the event of a malfunction of the LED, its zener diode will either be cut off, or broken through in the K / Z.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals the standby mode.
Repair or diagnostics of the motherboard 35017328 should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Repair of the board and replacement of THGBM5G5A1JBAIR, 25Q16BV, GL852GC, MSH9010-LF microcircuits are performed if the necessary equipment and the corresponding element base are available. Malfunctions associated with the use of BGA soldering technologies can be localized by the warm-up method.
The malfunction of the NXP18273 tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
Attention! Users and owners of K47DS712 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> DNS K47DS712 DNSK47DS712, Main: 35017328 KDL47XS712AN-LCD-KD3, Panel: K470B1LED3
The appearance of MainBoard 35017328 is shown in the figure below:35017328
35017328 can be used in TVs:
DNS K42DS712 (Panel KPL-420B1LED4K), DNS K47DS712 DNSK47DS712 (Panel K470B1LED3).
External view of the power supply
Main features of the DNS K47DS712 device:
Installed matrix (LED panel) K470B1LED3.
Matrix control uses the LC470DUE-SFR1 Timing Controller (T-CON).
The LED driver 35017884 is used to power the backlight LEDs, it is controlled by the iW7018-0, AP3041M-G1 PWM controller. The keys of the MBR20150CT, FDD86252 type are used as power elements of the LED driver.
The formation of the necessary supply voltages for all nodes of the DNS K47DS712 TV is carried out by the KPS-L110C3 power module, or its analogs using FSL206MR, FAN7930, LM358L microcircuits and power switches of the UK3568L type.
MainBoard - the main board (motherboard) is a 35017328 module, using THGBM5G5A1JBAIR, 25Q16BV, GL852GC, MSH9010-LF and others.
The NXP18273 tuner provides reception of television programs and tuning to channels.
DNS TV K47DS712 with LCD K470B1LED3, diagonal size 47 "(119 cm) format 16: 9. The required brightness of the screen 350 cd / m2 is provided by LED backlight. Contrast - the ratio of maximum brightness to minimum is 1200: 1. the model uses a panel with backlighting LEDs at the end - Edge LED.
There is support for 3D images using passive polarization technology.
The K470B1LED3 matrix and the MainBoard 35017328 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution at 1080p (Full HD).
K47DS712 has built-in SMART software and pre-installed Android operating system. Internet connection can be made via Wi-Fi wireless connection. The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and formation of a digital signal occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
Speaker power 20 W (2x10 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x4, MHL, USB x3, Ethernet (RJ-45), Wi-Fi. A headphone output is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1360x768, 1920x1080. The digital tuner is capable of receiving TV channels in DVB-T standards.
The TV uses a KPS-L110C3 power supply.
Dimensions: With stand 1067x688x275 mm, Without stand 1067x631x55 mm.
TV weight: 18.9 kg.
Attention! Panel K470B1LED3 LED-TV DNS K47DS712 is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.