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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Wednesday 16 September 2020

REPAIRING / SERVICING TV SAMSUNG UE43RU7470U

Technical description and composition of the SAMSUNG UE43RU7470U TV, panel type and modules used. The composition of the modules.
SAMSUNG LED
Model: UE43RU7470U
Chassis / Version: BN41-02703A
Panel: CY-NN043HGAVBH
LED backlight: BN61-15482A NU7100F NU7000F N5500F V8N4-430SM0-R0
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00947J REV1.0 L43E7_RSM
PWM Power: PFC, PWM
MainBoard: BN41-02703A BN94-14147H
IC MainBoard: CPU, eMMC, DRAM, AUDIO, DC / DC
Tuner: BN40-00331B
Specifications UE43RU7470U
SAMSUNG UE43RU7470U
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SAMSUNG UE43RU7470U does not turn on, does not respond to buttons and the remote control, indicators on the front panel do not light or flash.
With similar manifestations, a malfunction is most likely found in the BN44-00947J power module. It is necessary to measure its output supply voltages, and in their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in semiconductor PN junctions.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers PFC, PWM, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no picture, but there is sound and reaction to commands from the remote control. Or the image appears immediately after switching on and disappears.
As a rule, in this case, the backlight of the LED panel turns out to be faulty. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
When trying to detect a break in the LED lines, you should take 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 go into operation, does not respond to the remote control. The indicator on the front panel is constantly on or blinking.
Repair or diagnostics of the BN41-02703A motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). When repairing an MB board, it is necessary to check its components CPU, eMMC, DRAM, AUDIO, DC / DC. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
Before replacing the BN40-00331B tuner, if there is no tuning to the channels, you must first check the software and the supply voltage at its outputs. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Once again, we remind TV users: do not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repairs to professionals with sufficient experience in the field of electronic repair.

https://2.bp.blogspot.com/-YVfWKN0oudM/X2IDy-XKueI/AAAAAAABHI0/mUMhC9vwkZYOxBhF3-WhhVD6RVUi0RcoACK4BGAYYCw/s1600/BN41-02703A_DCE.jpg
https://4.bp.blogspot.com/-x1z6CgN1rKU/X2IDv2ioRwI/AAAAAAABHIs/oRr7EEHM084a_6NvmIz8DAUFQXEQ1p19ACK4BGAYYCw/s1600/BN44-00947J_DCE.jpgAdditional MainBoard Repair
The appearance of the MainBoard BN41-02703A is shown in the figure below:
BN41-02703A
External view of the power supply
The main features of the SAMSUNG UE43RU7470U device:
Installed matrix (LED panel) CY-NN043HGAVBH.
A converter combined with a power supply is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE43RU7470U TV is carried out by the BN44-00947J power module, or its analogs using PFC, PWM microcircuits.
MainBoard - the main board (motherboard) is a BN41-02703A module using CPU, eMMC, DRAM, AUDIO, DC / DC and others.
The BN40-00331B tuner provides reception of television programs and tuning to channels.

There are files to download for model UE43RU7470UXRU from the manufacturer:Latest firmware updates (latest firmwares):File type File name Version Date SizeUpdate file (USB) T-MSLDEUC.zip 1360.9 07/14/2020 1281.07 MbUpdate instruction 2019_TV_Firmware_Upgrade_Instruction_T-MSLDEUC.pdf 1.0 16.06.2020 0.49 MbUpdate file (USB) T-MSLDEUC_1360.9.exe 1360.9 07/14/2020 1280.78 MbUpdate file (USB) T-MSLDEUC_1360.9_RU.exe 1360.9 14.07.2020 1280.78 MbUser Manuals and Instructions:File type File name Version Date SizeUser manual BN68-09493R-00_URU7400G_EN_L02_190222.1.pdf 00 19.04.2019 0.83 MbBrief instructions BN68-09508A-00_QSG_URU7400G_CIS_190213.0.pdf 00 19.04.2019 0.56 MbInstruction PDF MUSDVBEUR-3.0.0_EM_MUSE_EU_ENG_190820.0.pdf 3.0.0 24.10.2019 22.14 MbPDF instruction MUSDVBEUR-3.0.0_EM_MUSE_EU_RUS_190820.0.pdf 3.0.0 10.24.2019 22.12 MbFiles can be downloaded from the manufacturer's website for the UE43RU7470UXRU model.

SAMSUNG UE43RU7470U TV with LCD CY-NN043HGAVBH, diagonal size 42.5 "(108 cm) 16: 9 format. The display technology of this model is implemented with LED backlighting.
CY-NN043HGAVBH sensor and MainBoard BN41-02703A main board software are capable of realizing images in the highest UHD quality at 3840x2160 pixels in 4K UHD, HDR standard. Image processing is performed using modern High Dynamic Range (HDR) technology with an extended range of brightness gradations.
The UE43RU7470U TV is equipped with SMART software, built-in applications and the ability to work on the Internet. The connection to the network can be carried out via Wi-Fi wireless connection. Supported media file formats: MP3, WMA, MPEG4, HEVC (H.265), MKV, JPEG.
Speaker sound system power 20 W (2x10 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, HDMI x3, USB x2, Ethernet (RJ-45), Bluetooth, Wi-Fi, Miracast.
The digital tuner can receive TV channels in the DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2 standards.
The power consumed when operating from the network is 120 W. Power supply BN44-00947J.
Dimensions: with stand 970x648x344 mm, without stand 970x563x58 mm.
TV weight: with stand: 12.1 kg, without stand: 9.5 kg.
Attention! Panel CY-NN043HGAVBH LED TV SAMSUNG UE43RU7470U is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
Posted By: FRANK at 05:29
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