Technical description and composition of the DEXP F42B8100K TV, panel type and applicable modules. The composition of the modules.Dexp
Model: F42B8100K
Chassis / Version: 35020422
Panel: 1920x1080 42 inch
Lamp backlight: Direct LED
T-CON: 6870C-0469A V11 42 DRD TM120 VER 1.4B
Inverter (backlight): integrated into PSU
PWM Inverter: AP3041
MOSFET Inverter: ME4N25
Power Supply (PSU): KIP-L090E02C1 -03
PWM Power: FSL206MR, FSFR1700, FAN7930
MOSFET Power: 18N50
MainBoard: 35020422 REV-01
IC MainBoard: CPU: MSD63691V, SPI FLASH: W25Q16, 25Q10
Technical Specifications F42B8100K
DEXP F42B8100K
General recommendations for repairing TV LCD
Possible manifestations of defects
- The DEXP F42B8100K TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
Often in such cases, the KIP-L090E02C1 power module is faulty. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (18N50) and the rectifier diodes of the converters for a short circuit probability.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers FSL206MR, FSFR1700, FAN7930, in the absence of visible damage or open faults between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 35020422 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). When repairing an MB board, you need to check its CPU components: MSD63691V, SPI FLASH: W25Q16. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> KIP-L090E02C1 Power supply
The appearance of the MainBoard 35020422 is shown in the figure below:35020422
The appearance of the power supply
Main features of the DEXP F42B8100K device:
Installed matrix (LCD panel) 1920x1080 42 inch.
The matrix control uses the Timing Controller (T-CON) 6870C-0469A.
To power the backlight, a converter is used, combined with a power supply, controlled by the AP3041 PWM controller. As power elements of the inverter, keys of the type ME4N25 are used.
The necessary supply voltages for all nodes of the DEXP F42B8100K TV are generated by the KIP-L090E02C1 power module or its analogs using FSL206MR, FSFR1700, FAN7930 microchips and 18N50 type power switches.
MainBoard - the main board (motherboard) is a module 35020422, using CPU chips: MSD63691V, SPI FLASH: W25Q16, 25Q10 and others.
The appearance of the MainBoard 35020422 is shown in the figure below:
35020422
The appearance of the power supply
Main features of the DEXP F42B8100K device:
Installed matrix (LCD panel) 1920x1080 42 inch.
The matrix control uses the Timing Controller (T-CON) 6870C-0469A.
To power the backlight, a converter is used, combined with a power supply, controlled by the AP3041 PWM controller. As power elements of the inverter, keys of the type ME4N25 are used.
The necessary supply voltages for all nodes of the DEXP F42B8100K TV are generated by the KIP-L090E02C1 power module or its analogs using FSL206MR, FSFR1700, FAN7930 microchips and 18N50 type power switches.
MainBoard - the main board (motherboard) is a module 35020422, using CPU chips: MSD63691V, SPI FLASH: W25Q16, 25Q10 and others.
TV DEXP F42B8100K with an LCD display, diagonal size 42 "(107 cm) in 16: 9 format. The required brightness of the screen is 300 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1200: 1. In LCD- The panel uses direct pixel illumination with rear LEDs - Direct LED.The TV features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD).
The F42B8100K is equipped with SMART software, embedded applications and the ability to work on the Internet. Connecting to the Internet can be done via Wi-Fi. The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the acoustic system of sound 20 W (2x10 W) provide two 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), AV, component, VGA, HDMI x4, MHL, USB x3, Ethernet (RJ-45), Wi-Fi. 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, 1920x1080. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
The power consumed by the TV working in the network mode is 90 watts.
Overall dimensions: with stand 965x610x250 mm, without stand 965x570x74 mm.
TV mass: with stand: 10 kg, without stand: 9 kg.
Attention! The DEXP F42B8100K LED TV panel is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.