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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Tuesday 15 September 2020

REPAIRING / SERVICING TV SAMSUNG UE32C6800

Technical description and composition of the SAMSUNG UE32C6800 TV, panel type and modules used. The composition of the modules.
SAMSUNG LED
Model: UE32C6800 UE32C6800US
Panel: LTF320HF02 (BN07-00858A)
LED driver (backlight): integrated into PSU
PWM LED driver: SELC2010
Power Supply (PSU): BN44-00355A
PWM Power: ICE3BR1765J (Standby), UCC25600 (PWM Resonant 8pin)
MOSFET Power: FQPF9N50CF
MainBoard: BN41-01444B BN94-03656E
IC MainBoard: SDP92, WT61P802, 24C02, 24C256, KFG8GH6U4M
Tuner: BN40-00175A
UE32C6800 Specifications
SAMSUNG UE32C6800
General recommendations for TV LCD LED repair
Possible manifestations of defects
- TV SAMSUNG UE32C6800 does not turn on and does not show any signs of turning on, does not respond to control buttons and to the remote control.
In some of these cases, a malfunction is detected in the BN44-00355A power supply module. Its output voltages should be measured, and in their absence, check the serviceability of the power switches (FQPF9N50CF) of the converters and rectifier diodes for the probability of a short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in the short-circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements, which can disable it in key mode, or provoke an excess of the maximum current or voltage values. These can be circuits supplying the PWM controller, damper or frequency setting circuits, or OOS (negative feedback) elements in the stabilization circuit. PWM controllers (PWM) ICE3BR1765J (Standby), UCC25600 (PWM Resonant 8pin), in the absence of external damage and short circuit between the terminals, are checked by replacing them with known good ones.
- There is no image, there is sound, it reacts to the remote control. Or, immediately after switching on for a second, the image may appear and immediately disappear.
In such cases, the most likely malfunction of the LED panel backlighting elements. Often the cause of a malfunction is the lack of current in the LED circuit, for example, their open or short circuit, or a violation of the contact connections of the connectors.
To check the LED strips for breakage without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter; a voltage of the order of several tens of volts is required.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the BN41-01444B motherboard should begin with checking the stabilizers and power converters necessary to power the microcircuits and matrix. If necessary, you should update or replace the software (software). Often the MB (SSB) board must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - SDP92, WT61P802, 24C02, 24C256, KFG8GH6U4M and replace the failed chips with new ones. Some malfunctions may be associated with the use of BGA soldering technologies in modern Main Board. Usually such defects are detected by local heating of the chip.

 If SAMSUNG UE32C6800 has no picture, but there is sound, often the LTF320HF02 display backlight simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
  • Replacing the LEDs requires disassembling the LTF320HF02 LCD panel, a process that requires experience and qualifications from the technician. We do not recommend doing such work on your own to the owners of TVs and craftsmen who do not have experience in repairing LCD panels
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see the light through the holes in the panel case.

In this case, the panel may also be faulty - damage to the strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard BN41-01444B often turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.

If these measurements are within normal limits, it is necessary to trace the passage of LVDS signals from MainBoard BN41-01444B, as well as synchronization signals to the loops with drivers, with an oscilloscope.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.

The malfunction of the BN40-00175A tuner 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 monitored with an oscilloscope.
Once again, I remind TV users: you should not try to repair yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair to professionals with sufficient experience in the field of electronic repair.


DOWNLOAD SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    Chassis : N96A for models UE32C66****, UE37C66****, UE40C66****, UE46C66****, UE32C68****, UE37C68****, UE40C68****, UE46C68**** - UE32C6600, UE32C6620, UE37C6600, UE37C6620, UE40C6600, UE40C6620, UE40C6800, UE40C6820, UE46C6600, UE46C6620, UE32C6800, UE32C6820, UE37C6800 ,UE37C6820, UE46C6800.


https://1.bp.blogspot.com/-KeFW8EZkgNA/X18-IXZKPfI/AAAAAAABG9U/LVznmOWi68IfoX_q_e75erm-78zW3DyhACK4BGAYYCw/s1600/BN44-00355A_DCE.jpgAdditional MainBoard Repair
The appearance of the MainBoard BN41-01444B is shown in the figure below:
BN41-01444B
BN41-01444B can be used in TVs:
SAMSUNG UE32C6000RW UE32C6000 (Panel LTF320HF02), SAMSUNG UE32C6700 UE32C6700US (Panel LTF320HF02 (BN07-00858A)), SAMSUNG UE37C6000 UE37C6000RW (Panel DA T370FBE6-R)
External view of the power supply
Main features of the SAMSUNG UE32C6800 device:
Installed matrix (LED panel) LTF320HF02 (BN07-00858A).
To power the backlight LEDs, a converter combined with a power supply is used, controlled by the SELC2010 PWM controller.
The formation of the necessary supply voltages for all nodes of the SAMSUNG UE32C6800 TV is carried out by the BN44-00355A power module, or its analogs using ICE3BR1765J (Standby), UCC25600 (PWM Resonant 8pin) chips and power switches of the FQPF9N50CF type.
MainBoard - the main board (motherboard) is a BN41-01444B module, using SDP92, WT61P802, 24C02, 24C256, KFG8GH6U4M and others.
The BN40-00175A tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTF320HF02
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Display Colors: 16.7M (8-bit)
Frequency: 120Hz
Lamp Type: WLED.








SAMSUNG UE32C6800 TV with LCD display LTF320HF02, diagonal size 32 "(81 cm) 16: 9 format. The display technology of this model implements LED backlighting.
The LTF320HF02 sensor and MainBoard BN41-01444B software allow viewing of broadcasts and movies in high quality HD at a resolution of 1920x1080 pixels in graphics resolution in 1080p (Full HD).
The UE32C6800 TV is equipped with SMART software, built-in applications and the ability to work on the Internet. The connection to the network can be carried out via Wi-Fi wireless connection. The input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is performed in the 480i, 480p, 576i, 576p, 720p, 1080i, 1080p standards. Supported media file formats: MP3, WMA, MPEG4, MKV, JPEG.
Sound speaker system power 20 W. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, RGB, VGA, HDMI x4, USB x2, Ethernet (RJ-45), Wi-Fi. A headphone jack is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is provided. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768, 1920x1080.
The digital tuner can receive television channels in the DVB-T MPEG4, DVB-C, DVB-S2 standards.
The power supply is BN44-00355A.
Dimensions: with stand 771x543x240 mm, without stand 771x480x30 mm.
TV weight: with stand: 11.1 kg, without stand: 8.3 kg.
Attention! SAMSUNG UE32C6800 LED TV panel LTF320HF02 is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.
Posted By: FRANK at 05:57
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