Technical description and composition of the DEXP F40B7100T TV, type of panel and applicable modules. The composition of the modules.DEXP LED
Model: F40B7100T
Chassis / Version: MSD6308-T9E
Panel: V400HJ6-ME2
LED backlight: V400HJ6- ME2-TREM1
LED driver (backlight): integrated into PSU
PWM LED driver: AP3041M-G1
MOSFET LED driver: SMK630
Power Supply (PSU): K-PL-L01
PWM Power: L6562D, L6599A
MainBoard: MSD6308-T9E 4704-6308T9-A1233G01
IC MainBoard: CPU: MSD6308RTEC-SW, Nand: MT29F2G08ABAEAWP
Technical Specifications F40B7100T
DEXP F40B7100T
General repair guidelines for TV LCD LED
Possible malfunctions
- DEXP F40B7100T does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
With such manifestations, a malfunction is most likely to be detected in the K-PL-L01 power module. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
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.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) L6562D, L6599A, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- 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
Usually in such cases there is no backlight LED-panel (matrix). Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
It is impossible to detect a break in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and to open their transitions, a voltage of several tens of volts is required. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect the probes in the forward direction to it (red probe to the anode, black to the cathode). 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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the motherboard MSD6308-T9E should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MSD6308RTEC-SW, Nand: MT29F2G08ABAEAWP and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
Owners of the F40B7100T TV are recommended to repair only qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
The appearance of the MainBoard MSD6308-T9E is shown in the figure below:MSD6308-T9E
The appearance of the power supply
Main features of the DEXP F40B7100T device:
Installed matrix (LED-panel) V400HJ6-ME2.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the AP3041M-G1 PWM controller. As power elements of the LED driver, keys of the SMK630 type are used.
The necessary supply voltages for all nodes of the DEXP F40B7100T TV are generated by the power module K-PL-L01, or its analogs using microcircuits L6562D, L6599A.
MainBoard - the main board (motherboard) is an MSD6308-T9E module, using CPU chips: MSD6308RTEC-SW, Nand: MT29F2G08ABAEAWP and others.
Additional technical information about the panel:
Brand: INNOLUX
Model: V400HJ6-ME2
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 878.112x485.352 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
DEXP F40B7100T TV with V400HJ6-ME2 LCD, 40 "(102 cm) diagonal, 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. Contrast - the ratio of maximum brightness to minimum is 5000: 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). Supported file formats mul Imedi: 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, audio x3, component, VGA, HDMI x3, MHL, USB. 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 900x560x280 mm, without stand 900x520x66 mm.
TV Weight: with stand: 11.4 kg, without stand: 10.5 kg.
Attention! The DEXP F40B7100T LED TV panel V400HJ6-ME2 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.