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 UE48H6800AU

Technical description and composition of the SAMSUNG UE48H6800AU TV, panel type and applicable modules. The composition of the modules.
SAMSUNG LED
Model: UE48H6800AU
Panel: CY-VH048CSLV1V
T-CON: BN41-02254A - 2014_TCON_FOX_FT3_H6800
LED driver (backlight): integrated into PSU
Power Supply (PSU): BN44-00727A - L55C2Q_EDY
MainBoard: BN41-02260A
Tuner: BN40-00292A
Technical Specifications UE48H6800
SAMSUNG UE48H6800AU
General repair guidelines for TV LCD LED
Malfunctions of the power module BN44-00727A - L55C2Q_EDY can be expressed in different ways, for example, SAMSUNG UE48H6800AU does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the rectifier bridge of the mains voltage and the power key (s) of the converter. The complete inoperability of the power supply unit can be caused by a short circuit in the power elements in the primary circuit, followed by an open fuse, or a short circuit in the loads.
As a rule, the keys in switching power supplies (SMPS) are reliable enough and rarely fail for no reason to be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If the SAMSUNG UE48H6800AU does not have an image, but there is sound and the TV is controlled by the remote control, a malfunction in the backlight circuits of the CY-VH048CSLV1V panel is likely. LEDs or their power converter - LED driver may be faulty. Often in such cases, when you turn on the TV, an image appears and immediately disappears. First of all, it is necessary to verify the operability of the electrolytic capacitors of the rectifier filter supplying the backlight assembly.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It requires disassembling the panel and checking the LEDs themselves, the rations of their terminals, as well as the reliability of the connections in the connectors and rations of the terminals.
To check the health in the LED circuit, it is better to use a current source with a maximum voltage of 200V. We do not recommend using any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (powered by 9 volts) in the P-N-junction test mode. If you connect the red probe of the multimeter to the anode of the LED, and the black to its cathode, then the 3-volt LED will light up slightly, and in the opposite direction you can detect the transition of the emergency zener diode. A zener diode PN junction indirectly indicates a LED-a
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Before changing the tuner BN40-00292A, if there is no possibility of tuning to television channels, you should make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair a SAMSUNG UE48H6800AU TV without the appropriate qualifications and experience can lead to its complete non-repairability!

The appearance of the MainBoard BN41-02260A is shown in the figure below:
BN41-02260A
The appearance of the power supply
Main features of the SAMSUNG UE48H6800AU device:
Installed matrix (LED panel) CY-VH048CSLV1V.
The matrix control uses the Timing Controller (T-CON) BN41-02254A.
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 UE48H6800AU TV is carried out by the BN44-00727A power module, or its analogues.
MainBoard - the main board (motherboard) is a BN41-02260A module.
The tuner BN40-00292A provides the reception of television programs and tuning to channels.

Posted By: FRANK at 07:39
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