Technical description and composition of the HAIER LE43F1000U TV, panel type and modules used. The composition of the modules.
Haier LED
Model: LE43F1000U
Chassis / Version: T.MS6488E.U731
Panel: CN430XB7240
LED backlight: K433030T030864J Rev1.1BC
LED driver (backlight): integrated into PSU
PWM LED driver: OB3368AP
Power Supply (PSU): AY090D-4SF01 3BS00729
MOSFET Power: TO-220
MainBoard: T.MS6488E.U731
IC MainBoard: K4B2G1646F-BYMA
Tuner: NoName
Specifications LE43F1000U
HAIER LE43F1000U
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- Haier LE43F1000U TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
In such cases, the power supply AY090D-4SF01 is usually defective. Its output voltages should be measured and, in their absence, the serviceability of the power switches (TO-220) and rectifier diodes in the converters should be checked for possible breakdown.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in an emergency mode of short circuit without output voltages, and with a short circuit in the elements of the primary circuit, the mains fuse most often breaks off immediately and, less often, the current sensor in the source of the key.
Breakdown of Mos-Fet keys used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
As a rule, in this case, the backlight of the LED panel is faulty. Usually, the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the K433030T030864J Rev1.1BC LED strips, but sometimes the LED driver is also faulty.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
If the HAIER LE43F1000U has no picture, but there is sound, often the CN430XB7240 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 when the ambient light hits the screen successfully.
Replacing the LEDs requires disassembling the CN430XB7240 LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to 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 T.MS6488E.U731 turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, 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 trace the passage of LVDS signals from the MainBoard T.MS6488E.U731 with an oscilloscope, as well as synchronization signals to the 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 T.MS6488E.U731 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). If it is not possible to replace the MB (SSB) board, it is necessary to check the serviceability of its elements - K4B2G1646F-BYMA. Defective components must be replaced.
If the TV works normally from external devices, but does not tune to TV channels, the NoName tuner may be faulty. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the reason for the inoperability of the tuner may be a software failure.
Attention! Users and owners of LE43F1000U TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from trying to repair themselves in order to avoid negative consequences that can lead to the complete non-repairability of the device.
Revision after repair of the backlight.
Decrease the backlight current from 460 mA to 365 mA - remove one of the 3 Ohm resistors (R555) in the backlight current sensor on the AY090D-4SF01 power supply board.
Limit the backlight current,
OB3368AP General information
To reduce the backlight current in LED drivers in LED drivers with an OB3368AP controller, you should proportionally increase the total resistance of the resistors from pin 17 of ISET to the case. The current in milliamperes in each channel is determined from the calculation 4000 * 1.2 / Rset, where Rset is the resistance from the 17 ISET pin to the case in kilo-ohms.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
The appearance of the MainBoard T.MS6488E.U731 is shown in the figure below:
T.MS6488E.U731
External view of the power supply
AY090D-4SF01:
AY090D-4SF01
The main features of the HAIER LE43F1000U device:
Installed matrix (LED panel) CN430XB7240.
To power the backlight LEDs, a converter combined with a power supply is used, controlled by the OB3368AP PWM controller.
The formation of the necessary supply voltages for all nodes of the HAIER LE43F1000U TV is carried out by the AY090D-4SF01 power module, or its analogs using power switches of the TO-220 type.
MainBoard - the main board (motherboard) is a T.MS6488E.U731 module, using K4B2G1646F-BYMA chips and others.
Tuner NoName provides reception of television programs and tuning to channels.
HAIER LE43F1000U TV with LCD display CN430XB7240, 42.5 "(108 cm) 16: 9 diagonal size. The required screen brightness of 240 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum brightness, is 1000: 1. The LCD panel of the TV is equipped with direct backlighting with LEDs located in the back - Direct LED.
The CN430XB7240 sensor and MainBoard T.MS6488E.U731 software realize high quality UHD images at 3840x2160 resolution in 4K UHD standard.
LE43F1000U TV is equipped with SMART software, built-in applications and the ability to work on the Internet. Internet connection can be made via Wi-Fi wireless connection. Supported media file formats: MP3, MPEG4, MKV, JPEG.
Speaker power 16 W (2x8 W) is provided by two speakers. Uses NICAM stereo processing system and Sound Surround function.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, VGA, HDMI x3, USB x3, Ethernet (RJ-45), Wi-Fi 802.11n. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C standards.
The power consumed by the TV operating in mains mode is 75 W. Power supply AY090D-4SF01.
Dimensions: with stand 967x605x206 mm, without stand 967x561x76 mm.
TV weight: 8.6 kg.
Attention! HAIER LE43F1000U LED TV panel CN430XB7240 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.