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 9 January 2020

REPAIR / SERVICING TV SAMSUNG UE40EH5057K

Technical description and composition of the TV  SAMSUNG UE40EH5057K
 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE40EH5057K UE40EH5057
Chassis / Version: U71A / HS02
Panel: CY-DE400BGSV1L
LED backlight: 40-3535LED-60EA-L / R D1GE-400SCA-R3 [12.04.09]
T-CON: DUNTK 5246TP
LED driver (backlight): integrated into PSU
PWM LED driver: SLC2012M
MOSFET LED driver: AOD4184
Power Supply (PSU): BN44-00496A PD40AVF_CSM
PWM Power: SSC2S110
MOSFET Power: STI13NM60N, AOD9N40
MainBoard: BN41-01795A BN94-05842M
IC MainBoard: WT61P805, EEprom: 24C256C4VCX, SPI Flash: 25Q40BVSIP
Tuner: BN40-00239B DNTS403EL144AA
Control: IR: UE5000 BN41-01840B
Appearance
SAMSUNG UE40EH5057K
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE40EH5057K 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.
Often with such manifestations, the main power module BN44-00496A is found to be faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (STI13NM60N, AOD9N40) and rectifier diodes in the converters for a short circuit.
In case of breakdowns in the secondary circuits, the converter can emergencyly operate in the short circuit mode, and during short circuit in the power 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, elements supplying a PWM controller, frequency-setting, damper, and also elements of the Negative Stabilization Feedback. The SSC2S110 chip is usually checked by replacement.
- There is no image, there is sound, there is a reaction to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Failure in most such cases is detected in the nodes and backlight elements of the LED panel. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to identify a break in the LED lines, it should be borne in mind 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 BN41-01795A 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 WT61P805, EEprom: 24C256C4VCX, SPI Flash: 25Q40BVSIP. 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 BN40-00239B DNTS403EL144AA may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding terminals. 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.
Attention to users! Self-repair of a SAMSUNG UE40EH5057K TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!

SCHEMATIC ------------->  Samsung UE40EH5057K shassis U71A,U71B.
UE32EH5****, UE22ES5****, UE37EH5**** UE19ES4****, UE40EH5****, UE46EH5****, UE26EH4****, UE32EH4****



 The appearance of the MainBoard BN41-01795A is shown in the figure below:
BN41-01795A
BN41-01795A can be used in TVs:
SAMSUNG UE32EH4000 UE32EH4000W (Panel LTJ320AP03-L), SAMSUNG UE32EH5000W (Panel DE320BGM-C1), SAMSUNG UE26EH4000W (Panel T260XVN01.1), SAMSUNG UE32EH5007K UE32EH5007 (Panel LTJ320HN07-L), SAMSUNG UE32EH5047K UE32EH5047 (Panel DE320BGA-B1), SAMSUNG UE40EH5007K (Panel CY-DE400BGSV1L), SAMSUNG UE32EH5057K (Panel DE320BGA-B1), SAMSUNG UE40FH5007K (Panel CY-DF400BGLV1V), SAMSUNG UE40EH5047K (Panel LTJ400HM08-L), SAMSUNG UE40EH5057K UE40EH5057 (Panel CY-DE400BGSV1L), SAMSUNG UE40EH5050W UE40EH5050 (Panel CY-DE400BGSV1L), SAMSUNG UE40EH5000 UE40EH5000W (Panel LTJ400HM801-V), SAMSUNG UE32EH5000K UE32EH5000 (Panel LTJ320HN07-L), SAMSUNG UE32EH5000W UE32EH5000 (Panel DE320BGM-C1), SAMSUNG LE32E420E2W LE32E420 (Panel LTF320AP13), SAMSUNG UE32EH4030 UE32EH4030W (Panel DE320AGH-C2), SAMSUNG UE46EH5057K UE46EH5057 (Panel LTJ460HN05-L), SAMSUNG UE40EH5040 UE40EH5040W (Panel CY-DE400BGSV1L).

The appearance of the power supply
Main features of the SAMSUNG UE40EH5057K device:
Installed matrix (LED panel) CY-DE400BGSV1L.
The matrix control uses the DUNTK Timing Controller (T-CON).
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the SLC2012M PWM controller. As power elements of the LED driver, keys of the AOD4184 type are used.
The necessary supply voltages for all nodes of the SAMSUNG UE40EH5057K TV are generated by the BN44-00496A power module or its analogs using SSC2S110 microcircuits and power switches of the STI13NM60N, AOD9N40 type.
MainBoard - the main board (motherboard) is a BN41-01795A module, using WT61P805 chips, EEprom: 24C256C4VCX, SPI Flash: 25Q40BVSIP and others.
The tuner BN40-00239B DNTS403EL144AA provides the reception of television programs and tuning to channels.
Posted By: FRANK at 06:42
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