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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Thursday, 2 January 2020

REPAIR / SERVICING TV SAMSUNG UE26D4003

Technical description and composition of the SAMSUNG UE26D4003 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE26D4003 UE26D4003BW
Chassis / Version: U57E / CN01
Panel: LD260AGC-C1
LED backlight: 2011SVS26 4K H1 1CH 110308
LED driver (backlight): integrated into PSU
PWM LED driver: SEM5025
Power Supply (PSU): BN44-00471A PD26G0S_BSM
PWM Power: STRW6053S, PC807B, TL431A
MainBoard: BN41-01702A BN94-04900L
IC MainBoard: K4B1G1646G-BCH9, AT24C256C, 25X40BVSIG, Flash NAND: KFG1GN6W2D (BGA), LVC244A, DRV612, NTP-7411S
Tuner: BN40-00220A
Control: IR: BN96-17614T (BN41-01695A)
Technical Specifications UE26D4003
SAMSUNG UE26D4003
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE26D4003 TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
In such cases, the fault should be sought first in the BN44-00471A power supply module. Then it is necessary to measure its output voltages 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 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.
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 STRW6053S, PC807B, TL431A are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
Failure in most such cases is detected in the nodes and 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.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Usually, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as a health indicator. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the BN41-01702A 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). When repairing an MB board, you need to check its components K4B1G1646G-BCH9, AT24C256C, 25X40BVSIG, Flash NAND: KFG1GN6W2D (BGA), LVC244A, DRV612, NTP-7411S. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the tuner BN40-00220A may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. You also need 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.
Owners and users of the SAMSUNG UE26D4003 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!

FIRMWARE FOR  SPI FLASH --------> SAMSUNG UE26D4003 UE26D4003BW U57E / CN01, Main: BN41-01702A BN94-04900L, Panel: LD260AGC-C1



The appearance of the MainBoard BN41-01702A is shown in the figure below:
BN41-01702A
BN41-01702A can be used in TVs:
SAMSUNG LE40D503F7W LE40D503F7WXRU (Panel LTF400HM05), SAMSUNG UE32D4003BW UE32D4003 (Panel LTJ320AP02-L), SAMSUNG UE40D5003 UE40D5003BW (Panel LD400B2402403 Panel U4002G2EBDUE UD40E2BDUEE
The appearance of the power supply
Main features of the SAMSUNG UE26D4003 device:
Installed matrix (LED-panel) LD260AGC-C1.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the SEM5025 PWM controller.
The necessary supply voltages for all nodes of the SAMSUNG UE26D4003 TV are generated by the BN44-00471A power module or its analogs using STRW6053S, PC807B, TL431A microcircuits.
MainBoard - the main board (motherboard) is a module BN41-01702A, using microcircuits K4B1G1646G-BCH9, AT24C256C, 25X40BVSIG, Flash NAND: KFG1GN6W2D (BGA), LVC244A, DRV612, NTP-7411S and others.
The tuner BN40-00220A provides the reception of television programs and tuning to channels.


Posted By: FRANK at 07:18
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