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 LED2472FDTG

Technical description and composition of the BBK LED2472FDTG TV, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: LED2472FDTG
Chassis / Version: S245P140YYNJ2LA
Panel: LC230EUE (TD) (A1)
LED driver (backlight): L-CEM1
PWM LED driver: BIT3251 (8)
MOSFET LED driver: ME15N10-G (3)
Power Supply (PSU): FSE060E0 L-CEM1
PWM Power: PWM SOT23-6 (9135)
MainBoard: L0M04 88XR-L1M04002473DT KB-6160
IC MainBoard: MSD309PX-LF-Z1, Winbond 25Q32, YD1517
Tuner: NoName
Control: RC-LED100
Technical Specifications LED2472FDTG
BBK LED2472FDTG
General repair guidelines for TV LCD LED
Possible manifestations of defects
- BBK LED2472FDTG TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
In the vast majority of such cases, a malfunction is detected in the FSE060E0 power module. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary first of all to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the power 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 SOT23-6 (9135). It is checked only by replacement with a known good one.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be both in the power of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It is impossible to check the line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 88XR-L1M04002473DT 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).
TV users and owners need to remember that attempts to self-repair a BBK LED2472FDTG TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!


BBK Version LED2472FG - Main: E182VG-Z1-B0 2012.05.30 (SPI Flash 25Q32); PSU: F782018223; Panel: LM230WF5 (TL) (D1) LG Display




The appearance of the MainBoard L0M04 is shown in the figure below:
L0M04
The appearance of the power supply
Main features of the BBK LED2472FDTG device:
Installed matrix (LED-panel) LC230EUE (TD) (A1).
The LED driver L-CEM1 is used to power the backlight LEDs, it is controlled by the BIT3251 PWM controller (8). As the power elements of the LED driver, keys of the type ME15N10-G (3) are used.
The necessary supply voltages for all nodes of the BBK LED2472FDTG TV are generated by the FSE060E0 power module or its analogs using PWM SOT23-6 (9135) microcircuits.
MainBoard - the main board (motherboard) is an L0M04 module, using microchips MSD309PX-LF-Z1, Winbond 25Q32, YD1517 and others.
The NoName tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC230EUE-TDA1
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 (8-bit)
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: LED2472FDTG.
Briefly from the TV: LCD, 1080p Full HD, diagonal 23 "(58 cm), HDMI: 2, USB, backlight type: Edge LED.
The composition uses MainBoard L0M04 and LCD-panel (matrix) LC230EUE (TD) (A1).
Power Supply Unit (PSU) FSE060E0 L-CEM1 Power Supply.
BBK LED2472FDTG LED TV with LC230EUE LCD, diagonal size 23 "(58 cm) 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 side illumination from Edge LEDs.The design and technical capabilities of the TV include watching programs and movies in high quality HD with 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, MKV, VideoCD, SVCD, Picture CD, JPEG.
The power of the acoustic system of sound 6 W (2x3 W) provide 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, 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, 1360x768, 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 40 watts.
Overall dimensions: 589x425x125 mm.
TV Weight: 5.5 kg.
Attention! The LC230EUE (TD) (A1) panel of the BBK LED2472FDTG 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 07:19
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