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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Saturday 18 January 2020

REPAIR / SERVICING TV SAMSUNG UE46F8000

Technical description and composition of the SAMSUNG UE46F8000 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE46F8000 UE46F8000AT
Chassis / Version: U90A
Panel: CY-KF460DSLV1V
LED driver (backlight): integrated into PSU; 71V 295mA, 158V 442mA
Power Supply (PSU): BN44-00635A L46U2P_DHS REV 1.1
PWM Power: SEM3110A, 2A153D (Standby)
MainBoard: BN94-06618N
Tuner: BN40-00267A DNTT243IH145A
Technical Specifications UE46F8000
SAMSUNG UE46F8000
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE46F8000 TV does not turn on and does not show any signs of turning on. There are no reactions to the control buttons or the remote control.
With such manifestations, a malfunction is most likely to be detected in the BN44-00635A power supply module. Secondary output voltages should be measured, and if they are absent, check the operability of the power switches of the converters and rectifier diodes for a short circuit probability.
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.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM) SEM3110A, 2A153D (Standby). It is checked only by replacement with a known good one.
- 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.
In most cases, the malfunction is caused by the lack of a backlight display. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN94-06618N motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software).
If there is no reception of television channels, but the TV is working properly from external devices, first of all, check the voltage of the tuner BN40-00267A DNTT243IH145A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Attention! Users and owners of UE46F8000 TVs who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.

SCHEMATIC MANUAL ---------->  Chassis U90A Model: UE40F80****, UE46F80****, UE55F80****.

FIRMWARE Weltrend WT61P807, EEPROM AT24C512 --------> SAMSUNG UE46F8000 UE46F8000AT U90A, Main: BN94-06618N, Panel: CY-KF460DSLV1V


  The appearance of the MainBoard BN94-06618N is shown in the figure below:
BN94-06618N
The appearance of the power supply
Main features of the SAMSUNG UE46F8000 device:
Installed matrix (LED panel) CY-KF460DSLV1V.
To power the backlight LEDs, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SAMSUNG UE46F8000 TV are generated by the BN44-00635A power module or its analogs using SEM3110A, 2A153D (Standby) microcircuits.
MainBoard - the main board (motherboard) is a BN94-06618N module.
The tuner BN40-00267A DNTT243IH145A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 06:41
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