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-1002

Technical description and composition of the BBK 32LEM-1002 TV, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: 32LEM-1002 / T2C
Chassis / Version: LS1B
Panel: ECG320AB-LDV HD
LED backlight: CH 32 3228 07 REV1.0
LED driver (backlight): integrated into PSU; 410 mA
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: JUG7.820.00084054 LS1B 32C2000
IC MainBoard: Spi Flash: 25Q64
Tuner: DMI21-C2I3RH
Specifications 32LEM-1002 / T2C
BBK 32LEM-1002
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The BBK 32LEM-1002 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
In such cases, the R-HS070D-1MF11 power supply is usually faulty. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches (K8A65D) and the rectifier diodes of the converters for possible short-circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in case 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.
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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) PWM SOT23-6, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
The most likely in these cases is a malfunction of the LED backlight. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
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 JUG7.820.00084054 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 some cases, to repair the MB board (SSB), it may be necessary to replace the chips - Spi Flash: 25Q64 with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner DMI21-C2I3RH. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners of 32LEM-1002 TVs are recommended to contact qualified specialists with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH  ----------->   BBK 32LEM-1002/T2C LS1B, Main: JUG7.820.00084054 LS1B 32C2000, Panel: ECG320AB-LDV HD


 The appearance of the MainBoard JUG7.820.00084054 is shown in the figure below:
JUG7.820.00084054
JUG7.820.00084054 can be used in TVs:
BBK 32LEM-1002/T2C (Panel ECG320AB-LDV HD), DNS C46DC2000 (Panel M460F13-E1-S), ERISSON 32LEC2000 (Panel M320X13-E1-H).
The appearance of the power supply
Main features of the BBK 32LEM-1002 device:
Installed matrix (LED-panel) ECG320AB-LDV HD.
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-1002 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 JUG7.820.00084054 module, using Spi Flash chips: 25Q64 and others.
The DMI21-C2I3RH tuner provides television reception and channel tuning.


 BBK 32LEM-1002 / T2C LED TV with ECG320AB-LDV LCD, 32 "(81 cm) diagonal of 16: 9 format. The required screen brightness of 280 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum ( contrast ratio) is 3000: 1. This model uses lateral 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 systems , SECAM, NTSC. Graphic Digital signal processing and generation takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, JPEG.
The power of the sound system 16 W (2x8 W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, VGA, HDMI x3, USB. 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 736x495x220 mm, Without stand 736x443x70 mm.
TV Weight: 8.1 kg.
Attention! The panel of the ECG320AB-LDV HD LED TV BBK 32LEM-1002 / T2C 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 06:57
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