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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Wednesday 25 March 2020

REPAIR / SERVICING TV BBK LEM2483F

Technical description and composition of the BBK LEM2483F TV, type of panel and applicable modules. The composition of the modules.
BBK LED
Model: LEM2483F
Panel: LG LC 230EUE (TD) (A1)
Power Supply (PSU): AY036P-1HF08
PWM Power: PWM SOT23-6
MainBoard: T.MS18VG.62B 11505
IC MainBoard: CPU: MST6M181VG, SPI FLASH: 25Q32BA, AUDIO: YD1517P
Tuner: CDT 3SP512-36
Control: RC-LEM101
Technical Specifications LEM2483F
BBK LEM2483F
General repair guidelines for TV LCD LED
Possible malfunctions
- The BBK LEM2483F TV does not turn on, does not respond to the remote control and the control panel buttons, does not blink with any indicators.
In such cases, the fault should be sought first in the power module AY036P-1HF08. It is necessary to measure the secondary output supply voltage, 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 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 commands from the remote control. Or the image appears immediately after turning on and disappears.
Failure in most such cases is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the T.MS18VG.62B 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 there is no reception of television channels, but the TV works properly from external devices, first of all you need to check the power supply voltage of the CDT 3SP512-36 tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Once again, remind users! Attempts to self-repair a BBK LEM2483F TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!




 The appearance of MainBoard T.MS18VG.62B is shown in the figure below:
T.MS18VG.62B
T.MS18VG.62B can be used in TVs:
BBK LEM2483F (Panel LG LC 230EUE(TD)(A1)), BBK LEM1983 (Panel LM185WH2 (TL)(A1)), DNS M24AM2 (Panel M236HGE-P02), DNS E16A90 (Panel LP156WH4 (TL)(A1)), ERISSON 23LEN60 (Panel LM230WF5), ERISSON 22LEN60 (Panel LS215AFTNO), ERISSON 24LEN60 (Panel LM230WF5 ), ERISSON 15LEN60 (Panel B156XW02 V.2), IZUMI TLE22F750B (Panel M215HGE-L10), RUBIN RB-19S2U (Panel V185B1-PE1 A01 REV 1.0), SUPRA STV-LC18250FL (Panel B173RW01 V.3).
The appearance of the power supply
Main features of the BBK LEM2483F device:
Installed matrix (LED-panel) LG LC 230EUE (TD) (A1).
The necessary supply voltages for all nodes of the BBK LEM2483F TV are generated by the power module AY036P-1HF08, or its analogs using PWM SOT23-6 microcircuits.
MainBoard - the main board (motherboard) is a module T.MS18VG.62B, using CPU chips: MST6M181VG, SPI FLASH: 25Q32BA, AUDIO: YD1517P and others.
Tuner CDT 3SP512-36 provides the reception of television programs and tuning to channels.

Brand: BBK, Model: LEM2483F.
Shortly from the TV: LCD, 1080p Full HD, diagonal 24 "(61 cm), HDMI: 2, USB, backlight type: Edge LED.
The composition includes MainBoard T.MS18VG.62B 11505 and LCD panel (matrix) LG LC 230EUE (TD) (A1).
Power Supply Unit (PSU) AY036P-1HF08 Power Supply.
BBK LEM2483F LED TV with LG LCD, 24 "(61 cm) diagonal of 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 at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Input high-frequency or video signal can It 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 power consumed by the TV in the operating mode from the network is 48 watts.
Overall dimensions: With a support of 578x407x166 mm, Without a support of 578x379x53 mm.
TV Weight: 3.51 kg.
Attention! The LG LC 230EUE (TD) (A1) panel of the BBK LEM2483F 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 06:03
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