Technical description and composition of the HAIER LE39B7000C TV, panel type and applicable modules. The composition of the modules.HAIER LED
Model: LE39B7000C
Chassis / Version: TP.SIS231.PT71
Panel: T390XVN01.0
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MainBoard: TP.SIS231.PT71
IC MainBoard: CPU: SIS231, SPI Flash 25Q64, NT5CB64M16FP
Technical Specifications LE39B7000CF
HAIER LE39B7000C
General repair guidelines for TV LCD LED
Possible malfunctions
- The HAIER LE39B7000C does not turn on at all. There is no reaction to the remote control and control buttons from the front panel. Indicator lights do not light or flash.
The malfunction in such cases should be sought in the elements of the power source - mains voltage converter (AC / DC), which is located on the MainBoard TP.SIS231.PT71 main board. 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.
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) PWM SOT23-6, 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 and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
As a rule, in such cases there is no display backlight. 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 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 TP.SIS231.PT71 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. Checking or replacing CPU elements: SIS231, SPI Flash 25Q64, NT5CB64M16FP 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.
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.
The appearance of MainBoard TP.SIS231.PT71 is shown in the figure below:
TP.SIS231.PT71
TP.SIS231.PT71 can be used in TVs:
Haier LE40B7000C (Panel V390HJ1-PE1), HAIER LE39B7000C (Panel T390XVN01.0 ), SUPRA STV-LC32T500WL (Panel LC320TU3A), SUPRA STV-LC40T900WL (Panel 720p HD 1366x768).Key Features of HAIER LE39B7000C:
Installed matrix (LED-panel) T390XVN01.0.
To power the backlight LEDs, a converter is used, combined with the main board TP.SIS231.PT71.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a TP.SIS231.PT71 module, using CPU chips: SIS231, SPI Flash 25Q64, NT5CB64M16FP and others.
HAIER LE39B7000CF TV with a 39 "(99 cm) diagonal LCD display in 16: 9 format. The required screen brightness of 350 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 4000000: 1 is achieved by special control of the LEDs. In the LED panel This TV is equipped with end LED backlighting - Edge LED.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 graphical resolution according to the standard 1080p (Full HD).
The LE39B7000CF 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. The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. 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, SCART, VGA, HDMI x3, USB x2, Ethernet (RJ-45). 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, 1360x768, 1920x1080.
A digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C standards.
Overall dimensions: With stand 880x550x248 mm, Without stand 880x510x72 mm.
Attention! The panel of the HAIER LE39B7000CF LED TV 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.
