Technical description and composition of the HAIER LE42K5500TF TV, type of panel and applicable modules. The composition of the modules.HAIER LED
Model: LE42K5500TF
Chassis / Version: T.MS6486.751
Panel: V420HJ2-P01
LED backlight: LED42D15-01 3034201520V
T-CON: V420HJ2-P01
LED driver (backlight): integrated into PSU
PWM LED driver: OB3368AP
Power Supply (PSU): TV3902-ZC02-01 303C3902066
PWM Power: OB5269CP
MainBoard: T.MS6486.751 536D420CF11
IC MainBoard: NAND: MX30LF4G18AC-TI, DRAM: NT5CB256M16DP-EK, WIFI-2-M603USA1
Tuner: DVB-T, DVB-T2, DVB-C
Technical Specifications LE42K5500TF
HAIER LE42K5500TF
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The HAIER LE42K5500TF TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Failure in such cases should begin to be sought in the TV3902-ZC02-01 power supply circuits. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually 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 OB5269CP, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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, sometimes you can 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 TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the T.MS6486.751 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements of WIFI-2-M603USA1 requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
Before replacing the tuner DVB-T, DVB-T2, DVB-C, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
SCHEMATIC FOR PSU -------------------> TV3902-ZC02-01 Power supply
The appearance of MainBoard T.MS6486.751 is shown in the figure below:T.MS6486.751
The appearance of the power supply
Key Features of HAIER LE42K5500TF:
Installed matrix (LED panel) V420HJ2-P01.
The matrix control uses the Timing Controller (T-CON) V420HJ2-P01.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the OB3368AP PWM controller.
The necessary supply voltages for all nodes of the TV HAIER LE42K5500TF are generated by the TV3902-ZC02-01 power module, or its analogs using OB5269CP microcircuits.
MainBoard - the main board (motherboard) is a T.MS6486.751 module, using NAND chips: MX30LF4G18AC-TI, DRAM: NT5CB256M16DP-EK, WIFI-2-M603USA1 and others.
The tuner DVB-T, DVB-T2, DVB-C provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V420HJ2-P01
Type: a-Si TFT-LCD, CELL
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: Super MVA, Normally Black, Transmissive
Active Area: 919.296x517.104 mm
Surface: Antiglare (Haze 1%)
Glass Depth: 0.50 + 0.50 mm
Transmissivity: 5.9% (with Polarizer)
Contrast Ratio: 4000: 1
Display Colors: 16.7M (8-bit)
Response Time: 9.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
HAIER LE42K5500TF TV with V420HJ2-P01 LCD, 42 "(107 cm) diagonal size in 16: 9 format. The required screen brightness of 280 cd / m² is provided by LED backlighting. Contrast, as the ratio of maximum brightness to minimum, is 4000: 1. Dynamic contrast of 4,000,000: 1 is achieved by special control of the LEDs. The LED screen technology is implemented in the manufacturing technology of the screen of this model of the TV. HD quality at a resolution of 1920x1080 pixels in the graphic decomposition according to the standard 1080p (Full HD).
The LE42K5500TF 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, MPEG4, JPEG.
The power of the sound system 16 W (2x8 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, VGA, HDMI x3, 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.
The power consumed by the TV working in the network mode is 100 watts.
Overall dimensions: with stand 948x690x200 mm, without stand 948x593x55 mm.
TV mass: with stand: 10 kg, without stand: 7.8 kg.
Attention! The HAIER LE42K5500TF LED TV panel V420HJ2-P01 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.
