Technical description and composition of the HAIER LE42B8000TF TV, type of panel and applicable modules. The composition of the modules.HAIER LED
Model: LE42B8000TF
Chassis / Version: MS308C0-ZC01-01
Panel: V420HJ2-P01
LED backlight: LED42D15-01
LED driver (backlight): integrated into PSU; 430mA
PWM LED driver: OB3368AP
Power Supply (PSU): TV3902-ZC02-01 (D)
PWM Power: OB5269CP
MainBoard: MS308C0-ZC01-01
IC MainBoard: CPU: MSD6I681, SPI Flash: GD25Q64
Tuner: NoName
Technical Specifications LE42B8000TF
HAIER LE42B8000TF
General repair guidelines for TV LCD LED
Possible manifestations of defects
- HAIER LE42B8000TF 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.
In some of these cases, the main switching power supply, the TV3902-ZC02-01 module, is found to be faulty. It is necessary to measure its output voltages and, if they are absent, to check the short circuit probability in the converters power switches and rectifier diodes.
In case of breakdowns of semiconductors in the 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits OB5269CP are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and all other functions work. Sometimes when you turn on the image for a second appears and disappears.
Usually in such cases, a malfunction is detected in the backlight nodes of the LED panel. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard MS308C0-ZC01-01 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. Checking or replacing CPU elements: MSD6I681, SPI Flash: GD25Q64 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 changing the NoName tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the HAIER LE42B8000TF TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
SCHEMATIC MANUAL FOR PSU -----------------------> TV3902-ZC02-01 Power supply
FIRMWARE FOR SPI FLASH ---------------------> HAIER LE42B8000TF, Main: MS308C0-ZC01-01, Panel: V420HJ2-P01
The appearance of the MainBoard MS308C0-ZC01-01 is shown in the figure below:MS308C0-ZC01-01
The appearance of the power supply
Key Features of HAIER LE42B8000TF:
Installed matrix (LED panel) 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 LE42B8000TF are generated by the TV3902-ZC02-01 power module, or its analogs using OB5269CP microcircuits.
MainBoard - the main board (motherboard) is an MS308C0-ZC01-01 module, using CPU chips: MSD6I681, SPI Flash: GD25Q64 and others.
The NoName tuner provides television reception and channel tuning.
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 LE42B8000TF TV with a V420HJ2-P01 LCD display, diagonal size 42 "(107 cm) in 16: 9 format. LED TV backlighting is implemented in the technology for making this TV model’s screen. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standard Arti 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system 16 W (2x8 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 x2, component, SCART, VGA, HDMI x2, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C, DVB-T2 standards.
Overall dimensions: With stand 948x593x200 mm, Without stand 948x554x55 mm.
TV mass: 7.8 kg.
Attention! The HAIER LE42B8000TF 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.
