Technical description and composition of the DEXP F40C8000H TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F40C8000H
Chassis / Version: RSAG7.820.6954
Panel: LSC400HN02-702 HD400DF-E33 \ GM
LED backlight: JL.D40081330-003BS-M
T-CON: 15Y_40GF11BMB7S4LV0.1
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
MainBoard: RSAG7.820.6954 / ROH
Tuner: NoName
Control: WIFI: WN464CR_V01
Technical Specifications F40C8000H
DEXP F40C8000H
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The DEXP F40C8000H 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.
In such cases, the AC / DC voltage converter, which is combined with the main board RSAG7.820.6954, is often faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse 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, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of 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, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the RSAG7.820.6954 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).
If the TV works normally from external devices, but does not tune into television channels, the NoName tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Once again, remind users! Attempts to independently repair the DEXP F40C8000H TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard RSAG7.820.6954 is shown in the figure below:RSAG7.820.6954
Main features of the DEXP F40C8000H device:
Installed matrix (LED-panel) LSC400HN02-702 HD400DF-E33 \ GM.
The matrix control uses the Timing Controller (T-CON) 15Y_40GF11BMB7S4LV0.1.
To power the backlight LEDs, a converter is used, combined with the main board RSAG7.820.6954.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit.
MainBoard - the main board (motherboard) is an RSAG7.820.6954 module.
The NoName tuner provides television reception and channel tuning.
A DEXP F40C8000H TV with an LSC400HN02-702 LCD, 40 "(102 cm) diagonal size, 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 1200: 1. The LCD 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 F40C8000H 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. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the speaker system of sound 14 W (2x7 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, component, HDMI x2, MHL, USB x2, Ethernet (RJ-45), Wi-Fi. An output for connecting headphones is provided. A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: with stand 917x573x206 mm, without stand 917x537x90 mm.
TV Weight: with stand: 7.5 kg, without stand: 7.3 kg.
Attention! The panel LSC400HN02-702 HD400DF-E33GM LED-TV DEXP F40C8000H 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.