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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Monday 20 January 2020

REPAIR / SERVICING TV SAMSUNG UE49KS9000U

Technical description and composition of the SAMSUNG UE49KS9000U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE49KS9000U UE49KS9000
Chassis / Version: BN41-02504A
Panel: CY-XK049LLV2V
LED backlight: (BN96-39527A & / BN96-39528A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00879A L55E8_KHS
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F
MainBoard: BN41-02504A BN94-10929D
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: BN91-18201B BN94-10924E
Control: WIFI: WCK730B BN59-01239A
Technical Specifications UE49KS9000U
SAMSUNG UE49KS9000U
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE49KS9000U does not turn on, does not respond to buttons and remote control, indicators on the front panel do not light up and do not blink.
In such cases, the BN44-00879A power supply is usually faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, check the serviceability of power switches (N-FET TO-220F) and rectifier diodes for possible breakdown (short circuit).
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often 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, PWM, PWM microchips are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, all other functions of the TV work. When turned on, the image may sometimes appear for a second.
Usually in such cases there is no backlight LED-panel (matrix). More often the reason for this is the breakdown of the LEDs, or poor contact in the connectors of the strips, less often the LED driver may be malfunctioning.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-02504A 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.
Malfunction of the tuner BN91-18201B BN94-10924E is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, remind users! Attempts to self-repair a TV SAMSUNG UE49KS9000U without the appropriate qualifications and necessary experience can lead to its complete non-repairability!

The appearance of the MainBoard BN41-02504A is shown in the figure below:
BN41-02504A
The appearance of the power supply
Main features of the SAMSUNG UE49KS9000U device:
Installed matrix (LED-panel) CY-XK049LLV2V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE49KS9000U TV are generated by the BN44-00879A power module, or its analogs using PFC, PWM microcircuits, and N-FET TO-220F type power switches.
MainBoard - the main board (motherboard) is a BN41-02504A module, using CPU, eMMC, DRAM, AUDIO, DC / DC, and others.
The tuner BN91-18201B BN94-10924E provides the reception of television programs and tuning to channels.

Posted By: FRANK at 08:42
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