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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Sunday, 12 January 2020

REPAIR / SERVICING TV SAMSUNG UE40J6240AU

Technical description and composition of the SAMSUNG UE40J6240AU TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE40J6240AU
Chassis / Version: FA01
Panel: CY-GH040BGLVBV
LED backlight: AOT_40_5X6 + 5X3 3030FC_S_L1_V6_2015_11_04, AOT_40_5X6 + 5X3 3030FC_S_R1_V6_2015_11_04
T-CON: BN41-02481A BN95-03521A BN97-11524A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00703H L48S1_FDY
MainBoard: BN41-02353C (BN94-10812C)
IC MainBoard: W25Q40, 24c512
Control: MDL: WIBT40A BN96-30218F, WIDT30Q BN59-01174D, BN41-02149A REV: 1.3, UH5500_IR: BN41-02151A
Technical Specifications UE40J6240AU
SAMSUNG UE40J6240AU
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE40J6240AU TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
With such manifestations, a fault is most likely to be detected in the BN44-00703H power supply module. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a 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. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and a short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
In such cases, the most likely malfunction of the 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 TV does not turn on, the indicator signals standby or working mode, or blinks.
Repair or diagnostics of the BN41-02353C motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements W25Q40, 24c512. BGA chip malfunctions are usually easy to detect by warming up.
It should be remembered! Attempts to self-repair a SAMSUNG UE40J6240AU TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-serviceability of the device!



The appearance of the MainBoard BN41-02353C is shown in the figure below:
BN41-02353C
BN41-02353C can be used in TVs:
SAMSUNG UE50J6240 UE50J6240AU (Panel CY-GH050CSNV4V), SAMSUNG UE40J6230AU (Panel CY-GH040BGLVBV), SAMSUNG UE40J6240AU (Panel CY-GH040BGLVBV).
The appearance of the power supply
Main features of the SAMSUNG UE40J6240AU device:
Installed matrix (LED panel) CY-GH040BGLVBV.
The matrix control uses the Timing Controller (T-CON) BN41-02481A.
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 UE40J6240AU TV is carried out by the BN44-00703H power supply module, or its analogs.
MainBoard - the main board (motherboard) is a BN41-02353C module, using microchips W25Q40, 24c512 and others.
Posted By: FRANK at 06:44
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