Technical description and composition of the TCL LED40D3000 TV, panel type and modules used. The composition of the modules.
TCL LED
Model: LED40D3000
Chassis / Version: TP.S512C.PB772
Panel: LVF430NDEL CJ9W00
LED backlight: 40HR330M10A0 V4 4C-LB4010-HR01J
T-CON: V400HJ6-PE1
LED driver (backlight): integrated into MainBoard
PWM LED driver: MP3398E
MOSFET LED driver: N-FET TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: N-FET TO-220F
MainBoard: TP.S512C.PB772
IC MainBoard: SPI Flash: 25Q64
Tuner: DVBT / T2 & SAT
Specifications LED40D3000
TCL LED40D3000
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV TCL LED40D3000 does not turn on and does not show any signs of turning on, does not respond to control buttons and to the remote control.
In this case, the main power supply, the AC / DC voltage converter, may be faulty, the elements of which in this model are located on the main board MainBoard TP.S512C.PB772. It is necessary to measure its output supply voltages, and in their absence, check the serviceability of the power switches (N-FET TO-220F) of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually operate in an emergency in the short-circuit mode, and in the event of a 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 disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers PWM SOT23-6, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound and all other TV functions are working. The image sometimes appears for a second immediately after switching on and disappears.
Usually, in such cases, there is no backlighting of the LED panel (matrix). The reason for this may be an open circuit in the 40HR330M10A0 V4 4C-LB4010-HR01J LED circuit, or the problem is in the stabilization of their power supply.
To identify an open circuit in the LED lines without disassembling the panel, a current source is required. It is impossible to open the junctions connected in series with a simple multimeter; a voltage of several tens of volts is required.
If TCL LED40D3000 has no image, but there is sound, often the LVF430NDEL CJ9W00 display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LVF430NDEL LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV, light is visible through the holes in the panel case.
In this case, the panel may also be faulty - damage to strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But often the main board MainBoard TP.S512C.PB772 also turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within the normal range, it is necessary to use an oscilloscope to trace the passage of LVDS signals from MainBoard TP.S512C.PB772, as well as synchronizing signals to loops with drivers.
Flooded or unsuccessfully washed screens of LED-TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
- The TV does not turn on, the indicator signals the standby or operating mode, or blinks.
Repair or diagnostics of the TP.S512C.PB772 motherboard 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). When repairing MB board, you need to check its components SPI Flash: 25Q64. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If there is no reception of TV channels, but the TV is working properly from external devices, first of all, you need to check the supply voltage of the DVBT / T2 & SAT tuner and update the software. I2C communication pulses must be monitored with an oscilloscope.
We remind users again! Attempts to self-repair the TCL LED40D3000 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> TCL LED40D3000, Main: TP.S512C.PB772, Panel: LVF430NDEL CJ9W00.
Revision after repair of the backlight. MP3398E. Information from the master.
Decrease the backlight current from 280mA to 165mA. Increased resistance from pin 6 (ISET) to the body. Initially installed in parallel 2 resistors 560 kOhm and 175 kOhm - total 134 kOhm. Soldered one 200 kOhm resistor instead.
Driver current limitation. MP3398E. general information
To reduce the backlight current in LED drivers with an MP3398E controller, increase the resistance of the resistor from pin 6 (ISET) to the case. The maximum current in each channel (in milliamperes) for the resistor Rset (in kilo-ohms) is determined from the ratio ILed (mA) = 20362 / R (kOhm).
DOWNLOAD DIAGRAM / PDF MANUAL ------------------> MP3398E
Additional MainBoard Repair
The appearance of the MainBoard TP.S512C.PB772 is shown in the figure below:
TP.S512C.PB772
The main features of the TCL LED40D3000 device:
Installed matrix (LED panel) LVF430NDEL CJ9W00.
Matrix control uses the Timing Controller (T-CON) V400HJ6-PE1.
To power the backlight LEDs, a converter combined with the TP.S512C.PB772 main board is used, controlled by the MP3398E PWM controller. N-FET TO-252 switches are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using SOT23-6 PWM microcircuits and N-FET TO-220F power switches.
MainBoard - the main board (motherboard) is a TP.S512C.PB772 module, using SPI Flash chips: 25Q64 and others.
The DVBT / T2 & SAT tuner provides reception of television programs and tuning to channels.
TV TCL LED40D3000 with LCD LVF430NDEL, diagonal size 40 "(102 cm) 16: 9 format. The brightness of the screen, declared by the manufacturer, 250 cd / m2 is realized by LED backlight. Contrast - the ratio of maximum brightness to minimum, is not less than 5000 : 1. The technology of manufacturing the screen of this TV model is realized with LED backlighting.
The LVF430NDEL matrix and the MainBoard TP.S512C.PB772 software realize high quality HD images at a resolution of 1920x1080 pixels in 1080p (Full HD) graphics. Supported media file formats: MP3, MPEG4, MKV, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. Uses the NICAM stereo signal processing system and the Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x2, USB. A headphone output is provided. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C, DVB-S, DVB-S2 standards.
A power supply unit is used as part of the MainBoard.
Dimensions: with stand 905x548x186 mm, without stand 905x518x74 mm.
TV weight: with stand: 6.1 kg, without stand: 6 kg.
Attention! Panel LVF430NDEL CJ9W00 LED TV TCL LED40D3000 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.