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, 22 January 2020

REPAIR / SERVICING TV SAMSUNG UE55MU9000U

Technical description and composition of the SAMSUNG UE55MU9000U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE55MU9000U
Chassis / Version: FA01
Panel: CY-UM055FLLV1V
LED backlight: BN96-42347A & BN96-42348A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00879A L55E8_KHS
PWM Power: PWM SOT23-6
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02570A BN94-11609R
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: One connect BN94-11965C
Technical Specifications UE55MU9000U
SAMSUNG UE55MU9000U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE55MU9000U TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Usually with such manifestations, the defect is caused by faulty elements in the main power module BN44-00879A. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (N-FET TO-220F) and rectifier diodes for a probable short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) PWM SOT23-6, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- 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.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason may be a break in the LEDs, in the stabilization of their power supply, or in the violation of the contact connections of the strings
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the BN41-02570A 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). Board repair and replacement of CPU, eMMC, DRAM, AUDIO, DC / DC microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
If you suspect a malfunction of the One connect BN94-11965C tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Once again, remind users! Attempts to self-repair a TV SAMSUNG UE55MU9000U without the appropriate qualifications and necessary experience can lead to its complete non-repairability!


The appearance of the MainBoard BN41-02570A is shown in the figure below:
BN41-02570A
The appearance of the power supply
Main features of the SAMSUNG UE55MU9000U device:
Installed matrix (LED-panel) CY-UM055FLLV1V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE55MU9000U TV are generated by the BN44-00879A power supply module or its analogs using PWM SOT23-6 microcircuits and power switches of the N-FET TO-220F type.
MainBoard - the main board (motherboard) is a BN41-02570A module, using CPU, eMMC, DRAM, AUDIO, DC / DC and other chips.
The One connect BN94-11965C tuner provides TV reception and channel tuning.


Posted By: FRANK at 08:05
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