Technical description and composition of the BBK LEM4289F TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: LEM4289F
Chassis / Version: E182VG-Z0-A0
Panel: SEL420V6-S00E
Power Supply (PSU): 5800-P42EWB-W020
PWM Power: FSFR1700XSL, OB5223AP, OB6572CP (PFC)
MainBoard: E182VG-Z0-A0
IC MainBoard: MSH9010-LF, IT6633E-P, 25Q128V51Q, MST182VG, RT8296A, R620D, BM3407, SY8008B, SX8660Z
Tuner: R620D
Technical Specifications LEM4289F
BBK LEM4289F
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM4289F TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
Most often, with such manifestations, the main power module 5800-P42EWB-W020 is found to be faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
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 circuits (OOS) of stabilization. PWM controllers (PWM) FSFR1700XSL, OB5223AP, OB6572CP (PFC), 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, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
As a rule, in such cases there is no display backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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 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 E182VG-Z0-A0 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements MSH9010-LF, IT6633E-P, 25Q128V51Q, MST182VG, RT8296A, R620D, BM3407, SY8008B, SX8660Z. BGA chip malfunctions are usually easy to detect by warming up.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the R620D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
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 DIAGRAM / SERVICE MANUAL ------------------> BBK LEM3279, LEM3289, LEM3279F, LEM3289F, LEM4079F, LEM4289F, LEM4289F
Service Manual with Schematic Diagram 58 pages of 2012 on the LEM3279, LEM3289, LEM3279F, LEM3289F, LEM4079F, LEM4289F, LEM4289F models
The appearance of the MainBoard E182VG-Z0-A0 is shown in the figure below:E182VG-Z0-A0
E182VG-Z0-A0 can be used in TVs:
BBK LEM3279F (Panel T320HVN01.2 / SEL320V8-S0JB), BBK LEM4079F (Panel SEL390V7-S00E (WXGA)), BBK LEM4279F (Panel SEL420V6-S00E Rev.R1 PCB:C3 LED:S442), BBK LEM4289F (Panel SEL420V6-S00E).
Main features of the BBK LEM4289F device:
Installed matrix (LED panel) SEL420V6-S00E.
The necessary supply voltages for all nodes of the TV BBK LEM4289F are generated by the power supply module 5800-P42EWB-W020, or its analogs using the FSFR1700XSL, OB5223AP, OB6572CP (PFC) microcircuits.
MainBoard - the main board (motherboard) is an E182VG-Z0-A0 module, using microchips MSH9010-LF, IT6633E-P, 25Q128V51Q, MST182VG, RT8296A, R620D, BM3407, SY8008B, SX8660Z and others.
The R620D tuner provides TV reception and channel tuning.
BBK LEM4289F LED TV with SEL420V6-S00E LCD display, diagonal size 42 "(107 cm) in 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 4000 : 1. This model uses Edge LED backlighting, and the design and technical features of the TV include watching broadcasts and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal It 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, JPEG. Stereo sound is realized by two built-in speakers .Uses NICAM STEREO audio processing system.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, SCART, VGA, HDMI x3, 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, 1920x1080.
The power consumed by the TV in the operating mode from the network is 80 watts.
Overall dimensions: 1082x692x258 mm.
The mass of the TV: 17 kg.
Attention! The SEL420V6-S00E panel of the BBK LEM4289F 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.
BBK LEM4289F LED TV with SEL420V6-S00E LCD display, diagonal size 42 "(107 cm) in 16: 9 format. The required screen brightness of 450 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 4000 : 1. This model uses Edge LED backlighting, and the design and technical features of the TV include watching broadcasts and movies in high quality HD with a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal It 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, JPEG. Stereo sound is realized by two built-in speakers .Uses NICAM STEREO audio processing system.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, SCART, VGA, HDMI x3, 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, 1920x1080.
The power consumed by the TV in the operating mode from the network is 80 watts.
Overall dimensions: 1082x692x258 mm.
The mass of the TV: 17 kg.
Attention! The SEL420V6-S00E panel of the BBK LEM4289F 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.