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 8 April 2020

REPAIR / SERVICING TV AKAI LEA-55B57P

Technical description and composition of the AKAI LEA-55B57P TV, panel type and applicable modules. The composition of the modules.
AKAI LED
Model: LEA-55B57P
Chassis / Version: TP.MS3463S.PC821
Panel: LMC550HN07 // YQ550E6 4C-BL550E06N-WHS1
LED backlight: CC02550D602V09B, CC02550D602V10A
T-CON: 16Y_FF11BMA4C2LV0.3
LED driver (backlight): integrated into PSU
Power Supply (PSU): integrated into MainBoard
PWM Power: PFC & PWM
MainBoard: TP.MS3463S.PC821
IC MainBoard: CPU: MSD3463GSA-U6, SPI Flash: 25Q64CSIG, Audio: TPA3110LD2
Control: IR: 5WHS-E6IR55-YQ01 20160829
Technical Specifications LEA-55B57P
AKAI LEA-55B57P
General repair guidelines for TV LCD LED
Possible manifestations of defects
- AKAI LEA-55B57P does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In such cases, the AC / DC voltage converter is often faulty, which is combined with the main board TP.MS3463S.PC821. Then we recommend that you measure its output voltages and, if they are absent, you should check the health of the power switches and rectifier diodes of the converters for a probable short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
In such cases, the most likely malfunction of the LED backlight elements. 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 TP.MS3463S.PC821 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements of the CPU: MSD3463GSA-U6, SPI Flash: 25Q64. BGA chip malfunctions are usually easy to detect by warming up.
We recommend the owners of the LEA-55B57P TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
FIRMWARE FOR SPI FLASH  ----------->   AKAI LEA-55B57P, Main: TP.MS3463S.PC821, Panel: YQ550E6 4C-BL550E06N-WHS1
 
 The appearance of MainBoard TP.MS3463S.PC821 is shown in the figure below:
TP.MS3463S.PC821
Key features of the AKAI LEA-55B57P device:
Installed matrix (LED panel) LMC550HN07 or YQ550E6 4C-BL550E06N-WHS1.
The matrix control uses the Timing Controller (T-CON) 16Y_FF11BMA4C2LV0.3.
To power the backlight LEDs, a converter is used, combined with a power supply.
The power module is combined with the MainBoard and is made according to the flyback AC / DC voltage converter circuit using PFC & PWM microcircuits.
MainBoard - the main board (motherboard) is a module TP.MS3463S.PC821, using CPU chips: MSD3463GSA-U6, SPI Flash: 25Q64CSIG, Audio: TPA3110LD2 and others.

 Brand: AKAI, Model: LEA-55B57P.
Briefly from the TV: LCD, LED backlight, 55 ", 1920x1080, 1080p Full HD, DVR, there is a satellite tuner, sound: 20W, HDMI: 3.
The composition uses MainBoard TP.MS3463S.PC821 and LCD-panel LMC550HN07, or YQ550E6 4C-BL550E06N-WHS1. The power supply is combined with the MainBoard.
AKAI LEA-55B57P TV with LMC550HN07 LCD display, diagonal size 55 "(140 cm) in 16: 9 format. The required screen brightness of 250 cd / m² is provided by LED backlight LED. The ratio of maximum brightness to minimum (contrast) is 4500: 1 Direct LED backlighting is used in the LCD panel.The TV's design and technical features include viewing programs and movies in high quality HD at a resolution of 1920x1080 pixels in graphic resolution according to the standard 1080p (Full HD). Supported media file formats: MP3, M PEG4, MKV, JPEG.
The power of the sound system 20 W (2x10 W) provides 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, component, VGA, HDMI x3, USB x2. An output for connecting headphones is provided. The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
The power consumed by the TV working in the network mode is 138 watts.
Overall dimensions: With stand 1239x766x239 mm, Without stand 1239x723x76 mm.
TV Weight: 14.8 kg.
Attention! The panel LMC550HN07 LED-TV AKAI LEA-55B57P 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 06:10
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