REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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Sunday 22 March 2020

REPAIR / SERVICING TV BBK 32LEM-3081

Technical description and composition of the TV BBK 32LEM-3081, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: 32LEM-3081 / T2C
Chassis / Version: JUC7.820.00084054
Panel: M320X13-E2-H
T-CON: MT3151A05-5-XC-5; CS801, CS11103, CS902 // MT3151A05-3-XC-1
LED driver (backlight): integrated into PSU
PWM LED driver: OB3350CP
MOSFET LED driver: LP18N20, ME15N10-G
Power Supply (PSU): R-HS070D-1MF11
PWM Power: PWM SOT23-6
MOSFET Power: K8A65D
MainBoard: JUC7.820.00084054
IC MainBoard: SPI Flash: GD32Q64, F40-100GCP, H5TQ1G630FR, RT9108NB, MSB101A
Tuner: CH DMI21-C213RH
Control: RC-LEM100 & RC-LEM2012
Specifications 32LEM-3081 / T2C
BBK 32LEM-3081
General repair guidelines for TV LCD LED
In cases of any repair, it is advisable to always check the device power module. At a minimum, the filter elements of the secondary rectifiers in flyback converters - electrolytic capacitors must be inspected at least visually.
If the power supply unit R-HS070D-1MF11 malfunctions, the external manifestations may be different, for example, BBK 32LEM-3081 does not turn on and there is no indication of the indicator lights on the front panel. In this case, we recommend starting the repair of the power supply by checking the mains fuse. In the event of its breakage, the reason should be sought in the power semiconductor elements of the pulse converter of the main PSU. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter. Mos-Fet keys used in switching power supplies (SMPS) rarely fail for no reason to look for when checking other circuit elements. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The PWM controller chip can also cause a breakdown of the power switch of the converter.
If there is no image when you turn on the BBK 32LEM-3081, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the M320X13-E2-H panel, or in their power converter.
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. Open or shorted LEDs - a typical defect for a panel type M320X13-E2-H.
Diagnostics and repair of the JUC7.820.00084054 motherboard is carried out by checking the performance of the stabilizers or power converters of the module chips. In some cases, a software update is required. It is advisable to check the panel supply voltage directly on the LVDS connector.
Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. If the TV does not exit standby mode, it is necessary to update the software with the replacement of SPI Flash. The firmware is attached below.
Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
If you suspect a malfunction of the tuner CH DMI21-C213RH, first of all, you need to make sure that there is a supply voltage at its corresponding output.
Attention to users! Self-repair of the TV BBK 32LEM-3081 without the appropriate qualifications and experience can lead to its complete non-repairability!


FIRMWARE FOR SPI FLASH  ----------->   BBK 32LEM-3081 /T2C, Main: JUC7.820.00084054, Panel: M320X13-E2-H



1. Schematic Diagrams 24 pages of 2013 on the  19LEM-3082/T2C, 22LEM-3082/FT2C, 24LEM-1004/T2C, 28LEM-1003/T2C, 32LEM-1003/T2C, 32LEM-3081/T2C



 2. Schematic Diagrams 14 pages of 2015 on 32LEM-3081/T2C, 32LEX-5007/T2C, 32LEX-5025/T2C, 40LEX-5007/T2C, 40LEX-5007/FT2C, 40LEX-5025/FT2C, 40LEX-5035/FT2C, 43LEX-5007/FT2C, 50LEX-5022/FT2C, 50LEX-5025/FT2C, 55LEX-5022/FT2C




The appearance of the MainBoard LS1B is shown in the figure below:
LS1B
JUC7.820.00084054 can be used in TVs:
BBK 40LEM-3080/FT2C (Panel ECG390AH-LD2 (SN)), BBK 32LEM-3081/T2C (Panel M320X13-E2-H), BBK 32LEM-1003/T2C (Panel M320X13-E4-L HD), DEXP 28A3000 (Panel R-HS055D-1MF), DEXP 50A7000 (Panel C500F13-E3-A), DNS C28DC2000 (Panel M280X13-E1-H), DNS C39DC2000 (Panel M390F13-E1-A), ERISSON 42LEC2000 (Panel M420F13-E1-L (G1)), ERISSON 55LEC2000 (Panel M550F13-E1-A 1080p Full HD), ERISSON 28LEC2000 (Panel M280X13-E1-H), RUBIN RB-32SD8T2C (Panel M320X13-E3-H), TELEFUNKEN TF-LED32S12T2 (Panel M320X12-E9-A(1)).
The appearance of the power supply
Main features of the BBK 32LEM-3081 device:
Installed matrix (LED-panel) M320X13-E2-H.
The matrix control uses the Timing Controller (T-CON) MT3151A05-5-XC-5 ;.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the OB3350CP PWM controller. As power elements of the LED driver, keys of the type LP18N20, ME15N10-G are used.
The necessary supply voltages for all nodes of the TV BBK 32LEM-3081 are generated by the power module R-HS070D-1MF11, or its analogs using PWM SOT23-6 microcircuits and power switches of the K8A65D type.
MainBoard - the main board (motherboard) is a JUC7.820.00084054 module using SPI Flash chips: GD32Q64, F40-100GCP, H5TQ1G630FR, RT9108NB, MSB101A and others.
The CH DMI21-C213RH tuner provides TV reception and channel tuning.


Brand: BBK, Model: 32LEM-3081 / T2C.
Briefly from the TV: LCD, 720p HD, 32 "(81 cm) diagonal, HDMI: 3, supports DVB-T2, backlight type: Edge LED.
The composition uses MainBoard JUC7.820.00084054 and an LCD panel (matrix) M320X13-E2-H.
Power Supply Unit (PSU) R-HS070D-1MF11 Power Supply.

BBK 32LEM-3081 / T2C LED TV with M320X13-E2-H LCD, 32 "(81 cm) diagonal of 16: 9 format. The required brightness of the screen is 220 cd / m² with LED backlight. The ratio of maximum brightness to minimum (contrast) is 3000: 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 of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog PAL, SECAM, NTSC systems. Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG. Stereo sound is realized by two built-in speakers. NICAM STEREO audio processing system is used. .
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, VGA, HDMI x3. 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. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
Overall dimensions: With stand 734x493x219 mm, Without stand 734x440x88 mm.
Attention! The M320X13-E2-H panel of the BBK 32LEM-3081 / T2C 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.


Posted By: FRANK at 08:04
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