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, 22 January 2020

REPAIR / SERVICING TV SAMSUNG UE55JU7500

Technical description and composition of the SAMSUNG UE55JU7500 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE55JU7500 UE55JU7500U
Panel: CY-WJ055FLAV1V
LED backlight: LM41-00109Y, LM41-00109X
T-CON: 65T41-C03 T650QVR01.0 2015_AUO_UHD_HAWK_UFT
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00811A PSLF271M07A
MainBoard: BN41-02356B BN94-09078G
IC MainBoard: Hynix H26M41103HPR, K4B2G1646Q
Tuner: BN40-00309B
Control: WIFI / BT: BN59-01194E WCH730B
Technical Specifications UE55JU7500U
SAMSUNG UE55JU7500
General repair guidelines for TV LCD LED
Possible malfunctions
- The SAMSUNG UE55JU7500 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
Most often, with such manifestations, the main power module BN44-00811A is found to be faulty. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or explicit short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
Usually in such cases, a malfunction is detected in the backlight nodes 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 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. Typically, 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 an indicator of health. 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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the BN41-02356B 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).
We recommend the owners of the UE55JU7500 TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!



The appearance of the MainBoard BN41-02356B is shown in the figure below:
BN41-02356B
The appearance of the power supply
Main features of the SAMSUNG UE55JU7500 device:
Installed matrix (LED panel) CY-WJ055FLAV1V.
The matrix control uses the Timing Controller (T-CON) 65T41-C03.
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 UE55JU7500 TV is carried out by the BN44-00811A power supply module, or its analogs.
MainBoard - the main board (motherboard) is a BN41-02356B module, using Hynix H26M41103HPR, K4B2G1646Q, and others.
The tuner BN40-00309B provides the reception of television programs and tuning to channels.

Posted By: FRANK at 07:33
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