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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Sunday, 12 January 2020

REPAIR / SERVICING TV SAMSUNG UE40KU6402U

Technical description and composition of the SAMSUNG UE40KU6402U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE40KU6402U
Panel: CY-KK040HGNV4H
LED backlight: V6ER_395SMA_LED42_R2, V6ER_395SMB_LED42_R2
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00875A
MainBoard: BN41-02528A BN94-10773A
IC MainBoard: SDP1531, 25Q40, 25Q80, 24C512, K4F8E304H, K4F2E3S4H
Tuner: BN40-00323A
Technical Specifications UE40KU6402U
SAMSUNG UE40KU6402U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE40KU6402U TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
Failure in such cases should begin to be sought in the power supply circuits of BN44-00875A. Then it is necessary to measure its output voltage and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible 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 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 (OOS) stabilization circuits. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it reacts to the remote control, channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In such cases, the most likely malfunction of the backlight elements of the LED panel. 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 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 an indicator of serviceability. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- 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, you should 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 SDP1531, 25Q40, 25Q80, 24C512, K4F8E304H, K4F2E3S4H and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If you suspect a malfunction of the BN40-00323A 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.
It should be remembered! Attempts to self-repair a SAMSUNG UE40KU6402U TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!


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 UE40KU6402U device:
Installed matrix (LED panel) CY-KK040HGNV4H.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE40KU6402U television is carried out by the power module BN44-00875A, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02528A module, using microchips SDP1531, 25Q40, 25Q80, 24C512, K4F8E304H, K4F2E3S4H and others.
The tuner BN40-00323A provides the reception of television programs and tuning to channels.


Posted By: FRANK at 07:52
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