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 13 July 2020

REPAIR / SERVICING TV SUPRA STV-LC2414FD

Technical description and composition of the TV SUPRA STV-LC2414FD, type of panel and applicable modules. The composition of the modules.
SUPRA
Model: STV-LC2414FD
Chassis / Version: V1K11
Panel: M236MWF1
Lamp backlight: 4 LAMP CCFL
Inverter (backlight): IV0190415
PWM Inverter: TL494C
MOSFET Inverter: ME4542
Trans Inverter: 1900033 1036
Power Supply (PSU): AYP172003 REV1.2
MainBoard: JUG7.820.699-4 LS07
IC MainBoard: CPU: TSUMV26KE-LF, Spi Flash: 25Q40T, Eeprom: 24LC32B, Audio: SA7454
Tuner: TAF6-C2121VH
Technical Specifications STV-LC2414FD
SUPRA STV-LC2414FD
General repair guidelines for TV LCD
Possible malfunctions
- SUPRA STV-LC2414FD does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
Usually with such manifestations, the defect is caused by faulty elements in the main power module AYP172003. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually 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 an excess of the maximum current or voltage. 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 and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights up constantly or blinks.
Repair or diagnostics of the JUG7.820.699-4 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). Board repair and replacement of Cpu: TSUMV26KE-LF chips, Spi Flash: 25Q40T, Eeprom: 24LC32B, Audio: SA7454 are carried out with the necessary equipment, and the corresponding element base. Faults associated with the use of BGA processor soldering technology can be localized by the heating method.
Before replacing the TAF6-C2121VH tuner, if there is no tuning for the channels, first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.




The appearance of the MainBoard JUG7.820.699-4 is shown in the figure below:
JUG7.820.699-4
JUG7.820.699-4 can be used on TVs:
HYUNDAI H-LCD2418 (Panel M236MWF1), HYUNDAI H-LCD2218 (Panel M216H1-L01 Rev.C1), SUPRA STV-LC2214W (Panel LTA216AT01), SUPRA STV-LC1914WD (Panel HT185WX1-501), SUPRA STV-LC2214WD (Panel LTA216AT01), SUPRA STV-LC2414F (Panel M236MWF1), SUPRA STV-LC2414FD (Panel M236MWF1).
The appearance of the power supply
Main features of the SUPRA STV-LC2414FD device:
The matrix (LCD panel) M236MWF1 is installed.
To power the backlight, the inverter IV0190415 is used, it is controlled by the PWM controller TL494C. A transformer 1900033 1036 is installed in the inverter converter. Keys of type ME4542 are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2414FD TV is carried out by the AYP172003 power module, or its analogues.
MainBoard - the main board (motherboard) is a JUG7.820.699-4 module, using Cpu chips: TSUMV26KE-LF, Spi Flash: 25Q40T, Eeprom: 24LC32B, Audio: SA7454 and others.
The TAF6-C2121VH tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: IVO
Model: M236MWF1 R0
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1920x1080, FHD
Display Mode: TN, Normally White, Transmissive
Active Area: 521.28x293.22 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
LCD TV SUPRA STV-LC2414FD with LCD M236MWF1, diagonal size 24 "(61 cm) in 16: 9 format. The brightness of the screen is 300 cd / m² with CCFL (EEFL) fluorescent lamps. Contrast - the ratio of maximum brightness to minimum is 1000: 1. Dynamic contrast ratio of 4000: 1 is achieved by special control of the backlight. TV features include viewing programs and movies in high quality HD with a resolution of 1920x1080 pixels in the graphic resolution of the standard 1080p (Full HD). The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, VideoCD, SVCD, JPEG.
The power of the sound system 4 W (2x2 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x3, component, VGA, HDMI, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768.
The power consumed by the TV in the operating mode from the network is 45 watts.
Overall dimensions: 638x497x135 mm.
TV Weight: 8.5 kg.
Attention! The M236MWF1 panel of a SUPRA STV-LC2414FD LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen surface to avoid permanent damage to the LCD panel!
Posted By: FRANK at 06:16
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