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 UE48HU8500

Technical description and composition of the SAMSUNG UE48HU8500 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE48HU8500 UE48HU8500T
Chassis / Version: TH02
Panel: CY-KH048FSLV1V
LED backlight: Curved TV Backlight Strips
T-CON: 14Y_V22FU13TMGC4LV0.0
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00742A L55G4P_EHS
MainBoard: BN41-02257B BN94-07948A
IC MainBoard: MN864778P, K4B4G1646D-BCK0
Tuner: BN40-00278A
Control: Wi-Fi: WIDT30Q
Technical Specifications UE48HU8500
SAMSUNG UE48HU8500
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE48HU8500 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In some of these cases, a fault is detected in the BN44-00742A power module. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually breaks.
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 responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The most likely in these cases is a malfunction of the LED backlight. Often the cause is a malfunction of the LEDs (open circuit, short circuit ...), or the connectors of the strips (strings), less often the LED driver is malfunctioning.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the BN41-02257B 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 - MN864778P, K4B4G1646D-BCK0 with new ones or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00278A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
TV users and owners must remember that attempts to self-repair a SAMSUNG UE48HU8500 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!


The appearance of the MainBoard BN41-02257B is shown in the figure below:
BN41-02257B
BN41-02257B can be used in TVs:
SAMSUNG UE55HU8500T (Panel CY-KH055FSAV1V), SAMSUNG UE55HU7200U (Panel CY-VH055FGLV1V).
The appearance of the power supply
Main features of the SAMSUNG UE48HU8500 device:
Installed matrix (LED-panel) CY-KH048FSLV1V.
The matrix control uses the Timing Controller (T-CON) 14Y_V22FU13TMGC4LV0.0.
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 UE48HU8500 TV is carried out by the BN44-00742A power module, or its analogues.
MainBoard - the main board (motherboard) is a module BN41-02257B, using microcircuits MN864778P, K4B4G1646D-BCK0 and others.
The tuner BN40-00278A provides the reception of television programs and tuning to channels.


Posted By: FRANK at 07:26
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