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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday 24 March 2020

REPAIR / SERVICING TV BBK LED2451HD

Technical description and composition of the BBK LED2451HD TV, panel type and applicable modules. The composition of the modules.
BBK LED
Model: LED2451HD
Chassis / Version: L2M25
Panel: LM230WF5 (TL) (D1)
T-CON: LM230WF5-TL D1 P / N: 6870-1128A; LDA5001A, SM4005A
LED driver (backlight): Driver
PWM LED driver: BIT3251
MOSFET LED driver: 2504
Power Supply (PSU): TPE056 REV: 1.0
PWM Power: LD7575PS
MOSFET Power: FQPF8N60C
MainBoard: L2M25 (05)
IC MainBoard: TSUMV26KE-LF, EN25F40, TDA1517P
Tuner: DWE-7053BW-PLL1
Technical Specifications LED2451HD
BBK LED2451HD
General repair guidelines for TV LCD LED

 Service Manual with Schematic Diagram 61 pages 2009-2010 on the LED1951SI, LED2251HD, LED2451HD model.


Firmware SPI FLASH BBK LED2451HD L2M25, Main: L2M25 (05), Panel: LM230WF5 (TL) (D1)



Appearance of LED-driver with BIT3251 controller:
BIT3251

 
Repair MainBoard
The appearance of the MainBoard L2M25 is shown in the figure below:
L2M25
The appearance of the power supply
Main features of the BBK LED2451HD device:
Installed matrix (LED-panel) LM230WF5 (TL) (D1).
The matrix control uses the Timing Controller (T-CON) LM230WF5-TL.
Driver LEDs are used to power the backlight LEDs, controlled by the BIT3251 PWM controller. As power elements of the LED driver, keys of type 2504 are used.
The necessary supply voltages for all nodes of the TV BBK LED2451HD are generated by the TPE056 power module or its analogs using LD7575PS microcircuits and power switches of the FQPF8N60C type.
MainBoard - the main board (motherboard) is an L2M25 module, using TSUMV26KE-LF, EN25F40, TDA1517P, and others.
The tuner DWE-7053BW-PLL1 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM230WF5-TLD1
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 509.184x286.416 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


The composition uses MainBoard L2M25 (05) and the LCD panel (matrix) LM230WF5 (TL) (D1).
Power Supply Unit (PSU) TPE056 REV: 1.0 Power Supply.

BBK LED2451HD LED TV with LM230WF5 LCD, 24 "(61 cm) diagonal display in 16: 9 format. The required screen brightness of 300 cd / m² is provided by LED backlighting. The ratio of maximum brightness to minimum (contrast) is 1000: 1 The LED display technology is implemented in the model’s display manufacturing technology.The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution according to the standard 1080p (Full HD). 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, VideoCD, SVCD , Picture CD, JPEG.
The power of the sound system 3 W (2x1.5 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), component, SCART, RGB, VGA, HDMI, 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, 1920x1080.
The power consumed by the TV in the operating mode from the network is 48 watts.
Overall dimensions: 573x400x170 mm.
TV Weight: 4.8 kg.
Attention! The LM230WF5 (TL) (D1) panel of the BBK LED2451HD 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 07:07
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