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 UE55NU7170U

Technical description and composition of the SAMSUNG UE55NU7170U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE55NU7170U UE55NU7170
Chassis / Version: FA01
Panel: CY-NN055HGLV2V
LED backlight: EDGE LED
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00932B REV1.2 L55E6_NSM
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02635B BN94-13275E
IC MainBoard: CPU, eMMC, DRAM, AUDIO: TAS5749M
Tuner: BN40-00331A
Technical Specifications UE55NU7170U
SAMSUNG UE55NU7170U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- The SAMSUNG UE55NU7170U TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Often in such cases, the BN44-00932B power module is faulty. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches (N-FET TO-220F) and rectifier diodes of converters for possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
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, PWM, PWM microchips are usually checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and all other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
Usually in such cases there is no backlight LED-panel (matrix). Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver also turns out to be faulty.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the BN41-02635B 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). In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU, eMMC, DRAM, AUDIO: TAS5749M with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If a tuner BN40-00331A is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Attention to users! Self-repair of a SAMSUNG UE55NU7170U TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!



The appearance of the MainBoard BN41-02635B is shown in the figure below:
BN41-02635B
The appearance of the power supply
Main features of the SAMSUNG UE55NU7170U device:
Installed matrix (LED-panel) CY-NN055HGLV2V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE55NU7170U TV are generated by the BN44-00932B power module or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02635B module, using CPU, eMMC, DRAM, AUDIO: TAS5749M and others.
The tuner BN40-00331A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 08:08
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