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 UE49NU7100U

Technical description and composition of the SAMSUNG UE49NU7100U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE49NU7100U UE49NU7100
Panel: CY-NN049HGLV2V
LED backlight: AOT_49_NU7300_NU7100_2X38_3030C_d6t-2d1_19S2P REV.V4
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00932B L55E6_NSM PSLF171301A
MainBoard: BN41-02635A BN94-12798E
IC MainBoard: Audio: TAS5745
Tuner: BN40-00330B
Control: IR: CT171124
Technical Specifications UE49NU7100U
SAMSUNG UE49NU7100U
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE49NU7100U TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Usually with such manifestations, the defect is caused by faulty elements in the main power module BN44-00932B. It is necessary to measure its output voltages and, if they are absent, to check for short-circuit probabilities in the converters, power switches and rectifier diodes.
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 microcircuits are usually checked by replacement with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
In such cases, the most likely malfunction of the LED backlight elements. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
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 BN41-02635A 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). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - Audio: TAS5745. Defective components should be replaced.
Before changing the tuner BN40-00330B, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Owners and users of the SAMSUNG UE49NU7100U TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!


The appearance of the MainBoard BN41-02635A is shown in the figure below:
BN41-02635A
The appearance of the power supply
Main features of the SAMSUNG UE49NU7100U device:
Installed matrix (LED panel) CY-NN049HGLV2V.
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 UE49NU7100U television is carried out by the power module BN44-00932B, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02635A module, using Audio chips: TAS5745 and others.
The tuner BN40-00330B provides the reception of television programs and tuning to channels.


Posted By: FRANK at 07:45
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