Technical description and composition of the BBK 19LEM-1004 TV, panel type and applicable modules. The composition of the modules.BBK LED
Model: 19LEM-1004 / T2C
Chassis / Version: 919A4F8
Panel: C185X14-E3-P (G2)
LED driver (backlight): JUG7.820.846
PWM LED driver: HAI7101PB
MOSFET LED driver: ME15N10-G
Power Supply (PSU): PW52057C Rev: 01
PWM Power: LD7750RGR
MainBoard: JUC7.820.00085101 - 919A4F8004400 (LABEL_A)
IC MainBoard: Mstar MSB101A, H5TQ1G63EFR, A7ML454ZA, 25Q64, F40-100GCP, YD1517P
Tuner: DT21WN-2A-E
Technical Specifications 19LEM-1004 / T2C
BBK 19LEM-1004
General repair guidelines for TV LCD LED
Sometimes the BBK 19LEM-1004 TV simply does not turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the PW52057C Rev: 01 general power module. If it is working properly, you must check the standby batteries on the Main Board. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the LD7750RGR PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the BBK 19LEM-1004 does not have an image, but there is sound, there may be a malfunction of the C185X14-E3-P (G2) panel backlight LEDs or their power converter - LED driver.
In most cases of lack of backlight, it becomes necessary to disassemble the panel in order to check the LEDs, connectors, loops and all contact connections. If one or several LEDs does not work in one line, therefore, they are broken and should be replaced.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
In cases of attempts to repair the motherboard JUC7.820.00085101 - 919A4F8004400 (LABEL_A), it is necessary to check the operation of linear stabilizers and power converters of its microcircuits and, if possible, update the software (software). BGA chips can sometimes be diagnosed with local heating.
If it is not possible to replace the MB board (SSB), you need to check the health of its elements - Mstar MSB101A, H5TQ1G63EFR, A7ML454ZA, 25Q64, F40-100GCP, YD1517P. Defective components should be replaced.
Before replacing the DT21WN-2A-E tuner, if there is no channel tuning, 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
Attention to users! Independent repair of the BBK 19LEM-1004 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
FIRMWARE FOR SPI FLASH -----------> BBK 19LEM-1004/T2C, Main: JUC7.820.00085101, Panel: C185X14-E3-P (G2)
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-1004 device:
Installed matrix (LED panel) C185X14-E3-P (G2).
The LED driver JUG7.820.846 is used to power the backlight LEDs, it is controlled by the HAI7101PB PWM controller. As power elements of the LED driver, keys of the type ME15N10-G are used.
The necessary supply voltages for all nodes of the TV BBK 19LEM-1004 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 the Mstar MSB101A, H5TQ1G63EFR, A7ML454ZA, 25Q64, F40-100GCP, YD1517P and other chips.
Tuner DT21WN-2A-E provides the reception of television programs and tuning to channels.