Technical description and composition of the DEXP 49A8200 TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: 49A8200
Chassis / Version: 35019017
Panel: KPL + 490B1LED2K
LED backlight: 37024855 QZ
T-CON: 6870C-0481A
LED driver (backlight): integrated into PSU
PWM LED driver: AP3041M-G1
MOSFET LED driver: ME4N25
Power Supply (PSU): 35018645 34010817 KIP + L090E02C1 (-01)
PWM Power: FAN6755, FAN7930
MOSFET Power: 12N50, 10N60L
MainBoard: 35019017
IC MainBoard: SPI Flash: W25Q16DV, 25X10
Control: IR: 35019362, WiFi KJ-R8188RX6 VER1.0
Specifications 49A8200
DEXP 49A8200
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP 49A8200 does not turn on and does not show any signs of operability. Does not blink indicators and does not respond to any control buttons.
Often in such cases, the power supply module 35018645 turns out to be faulty. It is necessary to measure the secondary output voltage, and in case of their absence, check the health of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can 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.
To check the LED strips, 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 transitions in forward bias, you can sometimes detect the presence of a PN junction of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 35019017 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - SPI Flash: W25Q16DV, 25X10 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
Attention to users! Self-repair of the DEXP 49A8200 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
Power supply circuit and LED driver SCHEMATIC DIAGRAM ------------------> 35018645 KIP+L090E02C1 Power supply.
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).
The appearance of the power supply
Main features of the DEXP 49A8200 device:
Installed matrix (LED-panel) KPL + 490B1LED2K.
The matrix control uses the Timing Controller (T-CON) 6870C-0481A.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the AP3041M-G1 PWM controller. As the power elements of the LED driver, keys of the ME4N25 type are used.
The necessary supply voltages for all nodes of the DEXP 49A8200 TV are generated by the power supply module 35018645, or its analogs using FAN6755, FAN7930 microcircuits and power switches of the 12N50, 10N60L type.
MainBoard - the main board (motherboard) is a module 35019017, using SPI Flash chips: W25Q16DV, 25X10 and others.
DEXP 49A8200 TV with KPL + 490B1LED2K LCD, 49 "(124 cm) diagonal size of 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 1200: 1. In this model, a panel with an end arrangement of backlight LEDs is used - Edge LED.
There is support for 3D images using passive polarization technology. TV features include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition standard 1080p (Full HD).
The 49A8200 is equipped with SMART software, integrated 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, MPEG4, DivX, 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, audio x2, 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, 1024x768, 1360x768, 1920x1080. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 1010x688x230 mm, without stand 1010x645x73 mm.
TV Weight: 19.9 kg.
Attention! The KPL + 490B1LED2K panel of a DEXP 49A8200 LED TV 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.