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 UE55HU7200U

Technical description and composition of the SAMSUNG UE55HU7200U TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE55HU7200U
Chassis / Version: TH01
Panel: CY-VH055FGLV1V
LED backlight: DCGE-550DCA-R5
T-CON: STV5565EU22BC6LV0.3 LMF550FJ03-G
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00781A L55C4_EHC
PWM Power: SQD2011K (Standby)
MainBoard: BN41-02257B BN94-07775E
IC MainBoard: MN864778P, K4B4G1646D-BCK0
Tuner: BN40-00278A
Control: IR: BN41-02271A; Bluetooth: WIBT40A BN96-30218A; Wi-fi: WIDT30G BN59-01174A
Appearance
SAMSUNG UE55HU7200U
General repair guidelines for TV LCD LED
Possible manifestations of defects
- SAMSUNG UE55HU7200U TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Failure in such cases should begin to be sought in the power supply circuits BN44-00781A. 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 a short circuit.
In case of breakdowns of semiconductors in the 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 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 SQD2011K (Standby), in the absence of visible damage or obvious short-circuit between the terminals, are checked by replacing with new ones, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
The most likely in these cases is a malfunction of the LED backlight. 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 line of series-connected LEDs without a special current source, and for this purpose it is not safe to use any voltage sources above 12V. Then it remains only to open the panel and check each LED separately. Usually, Chinese 9V-powered multimeters light up a single 3-volt LED, if you connect the probes in the forward direction, the red probe to the anode, and the black to the cathode. 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 indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-02257B 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). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements MN864778P, K4B4G1646D-BCK0 requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If there is no reception of television channels, but the TV works properly from external devices, first of all, check the voltage of the tuner BN40-00278A and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
TV users and owners must remember that attempts to self-repair a SAMSUNG UE55HU7200U TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!



The appearance of the MainBoard BN41-02257B is shown in the figure below:
BN41-02257B
BN41-02257B can be used in TVs:
SAMSUNG UE55HU8500T (Panel CY-KH055FSAV1V), SAMSUNG UE55HU7200U (Panel CY-VH055FGLV1V).
Main features of the SAMSUNG UE55HU7200U device:
Installed matrix (LED panel) CY-VH055FGLV1V.
The matrix control uses the Timing Controller (T-CON) STV5565EU22BC6LV0.3.
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 UE55HU7200U TV is carried out by the BN44-00781A power module, or its analogs using SQD2011K (Standby) microcircuits.
MainBoard - the main board (motherboard) is a module BN41-02257B, using microcircuits MN864778P, K4B4G1646D-BCK0 and others.
The tuner BN40-00278A provides the reception of television programs and tuning to channels.
Posted By: FRANK at 07:07
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