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 UE26EH4000W

Technical description and composition of the SAMSUNG UE26EH4000W TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE26EH4000W
Chassis / Version: U71A // Ver. CS02
Panel: T260XVN01.1 // DE260AGA-B1, DE260AGM-C1
LED driver (backlight): integrated into PSU; 77V 260mA
Power Supply (PSU): BN44-00491A PD26AV0_CSM
MainBoard: BN41-01795A BN94-05546D
IC MainBoard: K4B1G1646G-BCH9, LVC244A, DRV612, NTP-7412S
Tuner: DTOD40FVL084A BN40-00231A
Control: BN59-00602A
Appearance
SAMSUNG UE26EH4000W
General repair guidelines for TV LCD LED
If the UE26EH4000W does not turn on, does not respond to the remote control and the front panel buttons, does not blink bulbs and does not show any signs of operability, the power supply module BN44-00491A PD26AV0_CSM is probably faulty in this case. When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
The breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
Sometimes the SAMSUNG UE26EH4000W TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a possibility of a malfunction of the LED driver - the power converter of the backlight LEDs of the T260XVN01.1 panel // DE260AGA-B1, DE260AGM-C1, or an open circuit in the LED circuit is possible. In such cases, first of all, it is necessary to verify the operability of the electrolytic capacitors of the filter by supplying the backlight unit.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
To open all the junctions, several tens of volts or more are necessary, and it is best to use a current source for such purposes. An open in the LED lines connected in series cannot be detected with a multimeter or tester without disassembling the panel. In the open panel, it is necessary to check each LED. If your multimeter cannot open the LED transitions in forward bias, then see the presence of the PN transition of the protective zener diode by connecting the probes in the opposite direction. If the zener diode is broken or broken in short-circuit, then the LED is faulty and needs to be replaced.
Diagnosis and repair of the BN41-01795A BN94-05546D motherboard usually begins with a test of the performance of the stabilizers and power converters of the module chips. In some cases, a software update is required.
In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - K4B1G1646G-BCH9, LVC244A, DRV612, NTP-7412S which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before replacing the DTOD40FVL084A BN40-00231A tuner, if there is no tuning for the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Remember! Attempts to self-repair by users of the SAMSUNG UE26EH4000W TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!


SCHEMATICS -----------> Samsung Chassis: U71A, U71B Model: UE32EH5****, UE22ES5****, UE37EH5****, UE19ES4****, UE40EH5****, UE46EH5****, UE26EH4****, UE32EH4****.

26EH4000W Ver: CS02 Panel: DE260AGM-C1
3 планки LED: BN96-21474A 26-3535LED-21EA D1GE-260SC0-R2.
T-CON V260B3-XC09.

26EH4000W UE26EH4000WXRU Ver: AS01 Panel: DE260AGA-B1
Планки LED: 2012SVS26 3228 HD 07 REV1.6 120719
T-CON: T260XVN01.1 26T11-C04


 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 UE26EH4000W device:
Installed matrix (LED panel) T260XVN01.1 or DE260AGA-B1, DE260AGM-C1.
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 UE26EH4000W TV is carried out by the power module BN44-00491A, or its analogues.
MainBoard - the main board (motherboard) is a module BN41-01795A, using microcircuits K4B1G1646G-BCH9, LVC244A, DRV612, NTP-7412S and others.
The tuner DTOD40FVL084A BN40-00231A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: T260XVN01.1
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: AMVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 2%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 07:25
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