Technical description and composition of the DNS 42AK9000 TV, panel type and modules used. The composition of the modules.DNS LED
Model: 42AK9000
Chassis / Version: 35019017
Panel: KPL + 420B1LED6K p / n: 72001350K
LED driver (backlight): KLD + L033E04-01; LED DR = 53V
Power Supply (PSU): KPS-L090C2
PWM Power: TEA1733
MOSFET Power: 4N60L
MainBoard: 35019017 KDL42XS716ANT-LGD-D6K
IC MainBoard: Spi Flash: Winbod W25Q16DVS
Tuner: NoName
Specifications 42AK9000
DNS 42AK9000
General recommendations for TV LCD LED repair
Possible manifestations of defects
- The DNS 42AK9000 TV does not turn on and does not show any signs of operability at all. No response to the remote control and front panel control buttons.
Most often, with similar manifestations, the main power module KPS-L090C2 turns out to be faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), the serviceability of the power switches (4N60L) of the converters and rectifier diodes should be checked for a possible short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor in the source of the key often breaks.
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) TEA1733, if they do not have 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, it reacts to the remote control. Or the image appears when turned on and disappears immediately
Often in such cases, there is no backlighting of the LED panel. The reason for this may be an open circuit in the LED circuit, or a problem in stabilizing their power supply.
To test the LED strips, in order to open all the transitions of the LEDs, several tens of volts or more are needed, it is best to use a current source for such purposes. The breakage of several PN junctions connected in series cannot be detected with a multimeter or tester. In such cases, it is necessary to open the panel and check each LED. If your multimeter cannot open the LED junctions in forward bias, you can sometimes detect the presence of a protective zener diode PN junction by connecting the probes in the opposite direction. If the zener diode is cut off or broken in K / Z, then the LED is faulty and needs to be replaced.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard 35019017 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). Complicated repair of MB (SSB) board is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the Spi Flash elements: Winbod W25Q16DVS. Malfunctions in BGA chips are usually easy to detect by warm-up.
The malfunction of the NoName tuner is established after checking the software and all supply voltages at its outputs. The data exchange of the tuner with the processor via the I2C bus can be monitored with an oscilloscope.
Attention! Users and owners of 42AK9000 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 42AK9000, Main: 35019017 KDL42XS716ANT-LGD-D6K, Panel: KPL+420B1LED6K p/n: 72001350K
The appearance of MainBoard 35019017 is shown in the figure below:35019017
35019017 can be used in TVs:
DEXP 49A8200 (Panel KPL+490B1LED2K), DEXP 42A8200 (Panel 420B1LED6K FHD), DNS 42AK9000 (Panel KPL+420B1LED6K p/n: 72001350K).
External view of the power supply
Main features of the DNS 42AK9000 device:
Installed matrix (LED panel) KPL + 420B1LED6K p / n: 72001350K.
The LED driver KLD + L033E04-01 is used to power the backlight LEDs ;.
The formation of the necessary supply voltages for all nodes of the DNS 42AK9000 TV is carried out by the KPS-L090C2 power supply module, or its analogs using TEA1733 microcircuits and 4N60L power switches.
MainBoard - the main board (motherboard) is a 35019017 module, using Spi Flash chips: Winbod W25Q16DVS and others.
Tuner NoName provides reception of television programs and tuning to channels.
DNS 42AK9000 TV with LCD display KPL + 420B1LED6K, diagonal 42 "(107 cm) in 16: 9 format. The required screen brightness of 350 cd / m2 is provided by LED backlighting. Contrast - the ratio of maximum to minimum brightness is 1200: 1. This model uses a panel with backlight LEDs - Edge LED.
There is support for 3D images using passive polarization technology.
Matrix KPL + 420B1LED6K p / n: 72001350K and MainBoard 35019017 software provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics decomposition at 1080p (Full HD).
42AK9000 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 x3, 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: 1920x1080. The digital tuner is capable of receiving television channels in DVB-T MPEG4, DVB-T2 standards.
The TV uses the KPS-L090C2 power supply.
Dimensions: With stand 958x622x250 mm, Without stand 958x566x44 mm.
Attention! Panel KPL + 420B1LED6K p / n: 72001350K LED TV DNS 42AK9000 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.