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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Tuesday 24 March 2020

REPAIR / SERVICING TV BBK LEM2241FDT

Technical description and composition of the BBK LEM2241FDT TV, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: LEM2241FDT
Panel: LM215WF4 (TL) (E7)
LED driver (backlight): LED-14B01 V2.0 CU-1 2E07364A E320267 SKYVIN
PWM LED driver: BIT3261 (8)
MOSFET LED driver: ME15N10-6 (3)
Trans LED driver: 220
Power Supply (PSU): AY036P-1HF08 FR-1 KB-3151C E123995
PWM Power: LD7536 (PWM SOT23-6)
MainBoard: RM-01 KB-6160 LM215WF4
Control: RC-LEM100
Technical Specifications LEM2241FDT
BBK LEM2241FDT
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM2241FDT TV does not turn on. There are no signs of operability. The indicators on the front panel do not shine and do not blink, and the remote control and control buttons do not respond.
In such cases, the fault should be sought first in the power module AY036P-1HF08. It is necessary to measure its secondary output voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a 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 the excess of maximum current or voltage values. 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) LD7536 (PWM SOT23-6). 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.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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.
- 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 RM-01 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).
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.

 FIRMWARE FOR SPI FLASH  ----------->   BBK LEM2241FDT (Main Board - T.MSD309.3C)


 Main features of the BBK LEM2241FDT device:
The matrix (LED panel) LM215WF4 (TL) (E7) is installed.
The LED driver LED-14B01 is used to power the backlight LEDs, it is controlled by the BIT3261 PWM controller (8). A transformer 220 is installed in the LED driver converter. Keys of the type ME15N10-6 (3) are used as power elements of the LED driver.
The necessary supply voltages for all nodes of the BBK LEM2241FDT TV are generated by the AY036P-1HF08 power module or its analogs using LD7536 microcircuits (PWM SOT23-6).
MainBoard - the main board (motherboard) is an RM-01 module.
Additional technical information about the panel:
Brand: LG Display
Model: LM215WF4-TLE7
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.5 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 476.64x268.11 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V

 Brand: BBK, Model: LEM2241FDT.
Short from TV: LCD, 1080p Full HD, diagonal 22 "(56 cm), HDMI: 2, USB, backlight type: Edge LED.
The composition uses MainBoard LM215WF4 and LCD panel (matrix) LM215WF4 (TL) (E7).
Power Supply Unit (PSU) AY036P-1HF08 FR-1 KB-3151C E123995 Power Supply.
BBK LEM2241FDT LED TV with LM215WF4 LCD, 22 "(56 cm) diagonal display in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1000: 1 This model uses lateral illumination from Edge LEDs.The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, DivX, MKV, Jpeg.
The power of the sound system 4 W (2x2 W) provide 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 x2, component, SCART, RGB, VGA, HDMI x2, 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, 1920x1080. The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 36 watts.
Overall dimensions: With a support 532x381x166 mm, Without a support 532x345x50 mm.
Mass of the TV: 3.12 kg.
Attention! The LM215WF4 (TL) (E7) panel of the BBK LEM2241FDT 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 08:13
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