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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Tuesday, 21 January 2020

REPAIR / SERVICING TV SAMSUNG UE50KU6000U

Technical description and composition of the SAMSUNG UE50KU6000U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE50KU6000U UE50KU6000
Chassis / Version: BN41-02528A
Panel: CY-GK050HGNV5V
LED backlight: LM41-00254A LM41-00253A
LED driver (backlight): integrated into PSU
MOSFET LED driver: TF8T50P 8A N-Channel
Power Supply (PSU): BN41-02500A REV1.4 BN94-10712A
PWM Power: PFC, PWM
MOSFET Power: N-FET TO-220F MMP60R360P
MainBoard: BN41-02528A BN94-11896C
IC MainBoard: SDP1531, K4F8E304HBMGCH, 25Q40CLSIP, 25Q80DVSIG, S24C512C
Tuner: BN40-00323A
Technical Specifications UE50KU6000U
SAMSUNG UE50KU6000U
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE50KU6000U 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.
Most often, with such manifestations, the main power module BN41-02500A is found to be faulty. It is then necessary to measure its output voltages and, if they are absent, you should check the power switches (N-FET TO-220F MMP60R360P) and the rectifier diodes of the converters for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PFC, PWM PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason can be found in the malfunction of the LEDs, in the violation of the contact connections of the LED strips, or in the provision of their power (LED driver).
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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-02528A 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 cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips SDP1531, K4F8E304HBMGCH, 25Q40CLSIP, 25Q80DVSIG, S24C512C and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
Before replacing the tuner BN40-00323A, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
We recommend the owners of the UE50KU6000U 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!

The appearance of the MainBoard BN41-02528A is shown in the figure below:
BN41-02528A
BN41-02528A can be used in TVs:
SAMSUNG UE43KU6650U (Panel CY-VK043HGAV5V), SAMSUNG UE43KU6000W UE43KU6000 (Panel CY-GK043HGEV1H), SAMSUNG UE55KU6400 UE55KU6400U (Panel CY-KK055HQLV4H), SAMSUNG UE49KU6670 UE49KU6670U (Panel CY-VK049HGLV4V), SAMSUNG UE40KU6000U (Panel LSF400FN05-L03 CY-GK040HGLV4V), SAMSUNG UE40KU6300U (Panel CY-WK040HGLV1V), SAMSUNG UE43KU6500U (Panel CY-VK043HGAV4V T430QVR01.0), SAMSUNG UE40KU6402U (Panel CY-KK040HGNV4H).
The appearance of the power supply
Main features of the SAMSUNG UE50KU6000U device:
Installed matrix (LED-panel) CY-GK050HGNV5V.
To power the backlight LEDs, a converter is used, combined with a power supply. As power elements of the LED driver, keys of the type TF8T50P 8A N-Channel are used.
The necessary supply voltages for all nodes of the SAMSUNG UE50KU6000U TV are generated by the BN41-02500A power module or its analogs using PFC, PWM microcircuits and power switches of the N-FET TO-220F MMP60R360P type.
MainBoard - the main board (motherboard) is a BN41-02528A module, using microchips SDP1531, K4F8E304HBMGCH, 25Q40CLSIP, 25Q80DVSIG, S24C512C and others.
The tuner BN40-00323A provides the reception of television programs and tuning to channels.

Posted By: FRANK at 08:18
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