Technical description and composition of the BBK 19LEM-1001 TV, type of panel and applicable modules. The composition of the modules.BBK LED
Model: 19LEM-1001 / T2C
Chassis / Version: JUC7.820.00085101
Panel: M185X12-E1-P (G4)
LED driver (backlight): JUG7.820.846
PWM LED driver: HAI7101PB
Power Supply (PSU): PW52057C
PWM Power: LD7750RGR
MainBoard: JUC7.820.00085101
IC MainBoard: CPU: Mstar MSB101A, SPI FLASH GD25Q64BS, DRAM: H5TQ1G63EFR, Sound: YD1517P
Tuner: DT21 WN-2A-E
Technical Specifications 19LEM-1001
BBK 19LEM-1001
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 19LEM-1001 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the PW52057C main power module. 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 the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most 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) LD7750RGR, 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 responds to the remote. Or the image may appear for a second when turned on and immediately disappears.
In some of these cases, the malfunction is caused by a lack of backlighting on the display. 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.
When trying to detect a break in the LED lines, it should be taken into account 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.
- 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 JUC7.820.00085101 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: Mstar MSB101A, SPI FLASH GD25Q64BS, DRAM: H5TQ1G63EFR, Sound: YD1517P which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If there is no reception of television channels, but the TV works properly from external devices, first of all it is necessary to check the voltage of the tuner DT21 WN-2A-E and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the BBK 19LEM-1001 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!
FIRMWARE FOR SPI FLASH -------------> BBK 19LEM-1001/T2C, Main: JUC7.820.00085101, Panel: M185X12-E1-P (G4)
The appearance of the MainBoard JUC7.820.00085101 is shown in the figure below:JUC7.820.00085101
JUC7.820.00085101 can be used in TVs:
BBK 22LEM-3082/FT2C (Panel C215X14-E2-P(G2)), BBK 24LEM-1004/T2C (Panel C236X13-E4-C(G2), BBK 19LEM-1004/T2C (Panel C185X14-E3-P (G2)), BBK 19LEM-1001/T2C (Panel M185X12-E1-P (G4) ), ROLSEN RL-19E1308T2C (Panel C185X14-E3-P(G2)), ROLSEN RL-22E1308FT2C (Panel C215X14-E2-P(G2)), ROLSEN RL-24E1302T2C (Panel C236X13-E2-C (G2) ).
The appearance of the power supply
Main features of the BBK 19LEM-1001 device:
Installed matrix (LED-panel) M185X12-E1-P (G4).
The LED driver JUG7.820.846 is used to power the backlight LEDs, it is controlled by the HAI7101PB PWM controller.
The necessary supply voltages for all nodes of the TV BBK 19LEM-1001 are generated by the PW52057C power supply module or its analogs using LD7750RGR microcircuits.
MainBoard - the main board (motherboard) is a JUC7.820.00085101 module, using CPU chips: Mstar MSB101A, SPI FLASH GD25Q64BS, DRAM: H5TQ1G63EFR, Sound: YD1517P and others.
The DT21 WN-2A-E tuner provides television reception and channel tuning.
BBK 19LEM-1001 LED TV with M185X12-E1-P LCD display, 19 "(48 cm) diagonal size in 16: 9 format. The required screen brightness of 200 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum ( contrast ratio) is 600: 1. This model uses side illumination from Edge LEDs. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard for graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog PAL systems , SECAM, NTSC. Graphic I process and generate digital signal in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG. Stereo sound is realized by two built-in speakers. An audio processing system is used. NICAM STEREO.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI, 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.
Overall dimensions: With stand 445x315x180 mm, Without stand 445x277x53 mm.
Mass of the TV: 2.9 kg.
Attention! The M185X12-E1-P (G4) panel of the BBK 19LEM-1001 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.