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-1023

Technical description and composition of the BBK 32LEM-1023 TV, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: 32LEM-1023 / TS2C
Chassis / Version: V1.0
Panel: V320BJ6-Q01
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: ME15N10
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6 AP3125
MOSFET Power: SMK0760F
MainBoard: CV512H-B42
IC MainBoard: CPU: 9206B 1533-DBN, SPI Flash: 25Q64
Tuner: DMI21-C512RH
Specifications 32LEM-1023 / T2C
BBK 32LEM-1023
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK 32LEM-1023 TV does not turn on and does not show any signs of operability. There is no reaction to either the remote control or the control buttons from the front panel.
With such manifestations, the power module, which in this model is built into the MainBoard CV512H-B42 main board, often fails. In this case, it is necessary to measure its secondary output voltages, and if they are absent, check the operability of the power switches and rectifier diodes of the AC / DC converter for the presence of a probable short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM). It is checked only by replacement with a known good one.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
The most likely in these cases is a malfunction of the LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the CV512H-B42 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). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - CPU: 9206B 1533-DBN, SPI Flash: 25Q64. Defective components should be replaced.
If you suspect a malfunction of the DMI21-C512RH tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention! For users and owners of 32LEM-1023 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
FIRMWARE FOR SPI FLASH  ----------->   BBK 32LEM-1023/TS2C V1.0, Main: CV512H-B42, Panel: V320BJ6-Q01

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    MainBoard CV512H-B42


 The appearance of the MainBoard CV512H-B42 is shown in the figure below:
CV512H-B42
CV512H-B42 can be used in TVs:
BBK 40LEM-1010/FT2C (Panel CX390DLEDM), BBK 32LEM-1023/TS2C (Panel V320BJ6-Q01), BBK 32LEM-3035/T2C (Panel LS320TU9A00 NJ), BBK 32LEM-1036/TS2C (Panel DS32D6AP0113), BBK 42LEM-1009/FT2C (Panel T420HVN06.1 CX420DLEDM), DEXP F40B7000E (Panel V400HJ6-PE1 CX400DLEDM).
Main features of the BBK 32LEM-1023 device:
Installed matrix (LED-panel) V320BJ6-Q01.
To power the backlight LEDs, a converter is used, combined with the main board CV512H-B42, controlled by the BIT3267 PWM controller. As the power elements of the LED driver, keys of the type ME15N10 are used.
The power module is combined with the MainBoard and is designed according to a flyback AC / DC voltage converter using PWM SOT23-6 AP3125 microchips and SMK0760F type power switches.
MainBoard - the main board (motherboard) is a CV512H-B42 module, using CPU chips: 9206B 1533-DBN, SPI Flash: 25Q64 and others.
The DMI21-C512RH tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V320BJ6-Q01
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 2%)
Transmissivity: 6.0% (with Polarizer)
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 8.5 (G to G)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V


Brand: BBK, Model: 32LEM-1023 / T2C.
Briefly from the TV: LCD, 720p HD, diagonal 32 "(81 cm), HDMI: 3, USB, there is support for DVB-T2.
BBK 32LEM-1023 / T2C LED TV with 32 ”(81 cm) diagonal LCD display in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 3000: 1. LED backlighting is implemented in the model’s display manufacturing technology. HD images can be viewed in high resolution at 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC . G Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i Supported media file formats: WMA, MPEG4, MKV, JPEG.
The power of the sound system 10 W (2x5 W) provides 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, audio x2, component, 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, 1360x768. The digital tuner is capable of receiving television channels in the DVB-T MPEG4, DVB-C MPEG4, DVB-T2 standards.
Overall dimensions: With stand 737x473x212 mm, Without stand 737x435x83 mm.
TV mass: 6 kg.
Attention! The BBK 32LEM-1023 / T2C LED TV panel 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 07:26
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