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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Sunday 19 July 2020

REPAIR / SERVICING TV SUPRA STV-LC2237FL

Technical description and composition of the SUPRA STV-LC2237FL TV, panel type and modules used. The composition of the modules.
SUPRA LED
Model: STV-LC2237FL
Chassis / Version: V2L06
Panel: TP215FT01
MainBoard: CV182L_B
IC MainBoard: SPI FLASH W25Q32
Tuner: CDT-3SP512-37
Control: Login to service: INPUT 2580
Technical Specifications STV-LC2237FL
SUPRA STV-LC2237FL
General recommendations for TV LCD LED repair
SUPRA STV-LC2237FL TV, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Sometimes, based on the visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements begin. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In the absence of any signs of operability, when SUPRA STV-LC2237FL does not turn on and does not signal anything with indicator lamps on the panel, there is a possibility of a malfunction of the TV power module. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
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 checked by replacing it with a known good one.
If the SUPRA STV-LC2237FL TV does not have a picture, but there is sound, a malfunction is likely in the LED backlight circuits of the TP215FT01 panel. It is also necessary to check the serviceability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply) for an overstated ESR.
Often, in the absence of backlighting, disassembly of the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of contact connections in the rulers and connectors.
It should be remembered that it is not possible to determine an open circuit in the LED lines without disassembling the panels using a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
Repair of the CV182L_B motherboard must begin with diagnostics and testing of all linear stabilizers or power converters of its microcircuits. Sometimes it may be necessary to update the software (software) - flashing FLASH or EEPROM.
Repair of the board and replacement of SPI FLASH W25Q32 microcircuits are made if the necessary equipment and the corresponding element base are available. Malfunctions associated with the use of BGA soldering technologies can be localized by warming up.
Before changing the tuner CDT-3SP512-37, if it is not possible to tune to television channels, make sure that there are supply voltages, including varicap power (30-33V), which must be measured on the corresponding tuner pins.
Attention to users! Self-repair of a TV SUPRA STV-LC2237FL without the appropriate qualifications and experience can lead to its complete non-repairability!

 FIRMWARE FOR SPI FLASH  ----------->   SUPRA STV-LC2237FL (V2L06), MAIN CV182L_B, PANEL TP215FT01


 In the event of malfunctions in the software of the SPI FLASH microcircuits manufactured by Winbond, they can restore their operability for some time after the temperature exposure - warming up the soldering station with a hairdryer or even a lighter. Usually this is enough to read the regular contents of the software. In such cases, the microcircuit must be replaced with a new one.
Repair MainBoard
The appearance of the MainBoard CV182L-B is shown in the figure below:
The CV182L-B motherboard uses the MST6M182VG processor, combined with a scaler and installed using BGA technology.
It is advisable to start this type of MainBoard repair by checking the voltage converters and linear stabilizers necessary to provide power to the processor nodes: 1.2V, 2.5V, 3.3V. Check the power supply of the LCD panel 5V or 12V, depending on the type of panel used, it is advisable directly on the LVDS connector. If, in the presence of the necessary supply voltage, the TV does not exit Stand-by mode, does not respond to the remote control and control buttons, the SPI Flash software should be updated.
CV182L_B can be used on TVs:
FUSION FLTV-22T9 (Panel TB215WU3), FUSION FLTV-19T9 (Panel LM185WH2(TL)(A1)), FUSION FLTV-19T9D (Panel TB190B1Z1), SUPRA STV-LC1625WL (Panel BT156GW01 V.A), SUPRA STV-LC1925WL (Panel MT185GW01 V.1), SUPRA STV-LC19810WL (Panel TB190B300-A), SUPRA STV-LC2237FL (Panel TP215FT01), SUPRA STV-LC1625WLD (Panel B156HW02), SUPRA STV-LC1937WL (Panel LM185WH2-TLA1).
Main features of the SUPRA STV-LC2237FL device:
Installed matrix (LED panel) TP215FT01.
The necessary supply voltages for all nodes of the SUPRA STV-LC2237FL TV are provided by a switching power supply.
MainBoard - the main board (motherboard) is a CV182L_B module, using SPI FLASH W25Q32 chips and others.
The CDT-3SP512-37 tuner provides reception of television programs and tuning to channels.
LED TV SUPRA STV-LC2237FL with LCD display TP215FT01, diagonal size 22 "(56 cm) 16: 9 format. The required brightness of the screen is 230 cd / m² LED backlight LED. Contrast - the ratio of maximum brightness to minimum is 1000: 1. Dynamic contrast ratio of 20,000: 1 is achieved by special control of the LEDs depending on the illumination of areas in the scene. This model uses an LED panel with an edge LED backlighting - Edge LED. The TV's capabilities provide viewing of programs and films in high quality HD at a resolution of 1920x1080 pixels in graphic decomposition according to 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 multimedia file formats: MP3, WMA, MPEG4, MKV, JPEG.
The power of the sound system of 6 W (2x3 W) is provided by two speakers. The NICAM STEREO audio processing system is used.
External interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, audio x2, component, SCART, VGA, HDMI, USB. A headphone output 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.
The power consumed by the TV in operating mode from the network is 40 watts.
Dimensions: With stand 793x565x205 mm, Without stand 793x508x89 mm.
TV weight: 3.6 kg.
Attention! The TP215FT01 panel of a SUPRA STV-LC2237FL LED TV is an expensive and unreliable element.
Avoid any impact on the glass and pressure on the surface of the screen to avoid damage to the LED panel!
It is also unsafe to get liquid on the screen. Sometimes one drop is enough if it flows down the glass onto the cables so that the TV becomes unrepairable.
Posted By: FRANK at 05:50
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