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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Monday, 20 January 2020

REPAIR / SERVICING TV SAMSUNG UE48JU7000

Technical description and composition of the SAMSUNG UE48JU7000 TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE48JU7000 UE48JU7000U
Panel: CY-GJ048FLLV1V
LED backlight: LM-00121G, LM-00121H
T-CON: BN41-02297A BN95-01945A BN95-01970A
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00811A L55S7_FSM
MainBoard: BN41-02356C BN94-09987C
IC MainBoard: CPU: SDP1406, SPI FLASH: Winbond 25Q40, EEPROM: 24C512
Tuner: BN40-00318B
Control: WIFI: BT WCH730B BN59-01194F
Technical Specifications UE48JU7000
SAMSUNG UE48JU7000
General repair guidelines for TV LCD LED
Possible malfunctions
- SAMSUNG UE48JU7000 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 in such cases, the BN44-00811A power module is faulty. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns of semiconductors in secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often 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 the excess of maximum current or voltage values. 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 short circuit between the terminals, are checked by replacing with obviously good ones.
- 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
Often in such cases, there is no LED backlight. 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the BN41-02356C 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). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CPU: SDP1406, SPI FLASH: Winbond 25Q40, EEPROM: 24C512. Defective components should be replaced.
The malfunction of the tuner BN40-00318B is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention TV owners! Attempts to self-repair SAMSUNG UE48JU7000 are not recommended by the manufacturer and can lead to serious negative consequences!



The appearance of the MainBoard BN41-02356C is shown in the figure below:
BN41-02356C
The appearance of the power supply
Main features of the SAMSUNG UE48JU7000 device:
Installed matrix (LED panel) CY-GJ048FLLV1V.
The matrix control uses the Timing Controller (T-CON) BN41-02297A.
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 UE48JU7000 TV is carried out by the BN44-00811A power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02356C module, using CPU chips: SDP1406, SPI FLASH: Winbond 25Q40, EEPROM: 24C512 and others.
The tuner BN40-00318B provides the reception of television programs and tuning to channels.
Posted By: FRANK at 08:17
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