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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 31 July 2020

REPAIRING / SERVICING TV SUPRA STV-LC32T410WL

Technical description and composition of the SUPRA STV-LC32T410WL TV, panel type and modules used. The composition of the modules.
SUPRA LED
Model: STV-LC32T410WL
Chassis / Version: V1N05 // V1N09
Panel: LC320DXJ-SFE1 // HV320WX2-206
LED driver (backlight): integrated into MainBoard
PWM LED driver: OCP8121
MOSFET LED driver: UF730L (TO-252)
Power Supply (PSU): integrated into MainBoard
PWM Power: FAN6755W (SOIC-7)
MOSFET Power: JCS7N65SB
MainBoard: KDL32PS618AT -LGD-196YTK
IC MainBoard: CPU: MSD1306XSEK, Spi Flash: 25Q32, 25X10, Audio: TDA7491LP
Tuner: NoName
STV-LC32T410WL Specifications
SUPRA STV-LC32T410WL
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- SUPRA STV-LC32T410WL TV does not turn on at all. Control lamps do not light up or blink. The TV on the remote control and control panel buttons does not respond.
In such cases, the common power supply is often faulty - the AC / DC converter of the mains voltage, which is combined with the elements of the KDL32PS618AT main board. Then you should measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of the power switches (JCS7N65SB) and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits of the converter, it can usually work in an emergency mode in a short circuit mode, and with a short circuit in the power elements of the primary circuit, the mains fuse or current sensor in the source of the key is most often cut off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM regulator, in frequency-setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) FAN6755W (SOIC-7) are usually checked by replacing them with new ones, or knowingly working properly.
- There is no image, there is sound, it reacts to the remote control. Or the image may appear for a second when turned on and disappear immediately.
Most likely in these cases is a malfunction of the LED backlight. The reason may be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
When trying to detect a break in the LED lines, it should be borne in mind that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not turn on, the indicator signals standby or operating mode, or blinks.
Repair or diagnostics of the KDL32PS618AT 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). Sometimes it is necessary to check or replace (if necessary) elements of the MainBoard - CPU: MSD1306XSEK, Spi Flash: 25Q32, 25X10, Audio: TDA7491LP. In cases where a BGA processor is used, its malfunction is usually detected by the local warm-up method.
If you suspect a malfunction of the NoName tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
We remind users again! Attempts to self-repair the SUPRA STV-LC32T410WL TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->   SUPRA STV-LC32T410WL V1N05, Main: KDL32PS618AT -LGD-196YTK, Panel: LC320DXJ-SFE1 // HV320WX2-206


DOWNLOAD FIRMWARE FOR SPI FLASH  ----------->   SUPRA STV-LC32T410WL V1N09, Main: KDL32PS618AT -LGD-196YTK, Panel: HV320WX2-206
 

 The appearance of the MainBoard KDL32PS618AT is shown in the figure below:
KDL32PS618AT
KDL32PS618AT can be used in TVs:
DNS K32D619 (Panel LC320DXJ(SF)(E1)), SUPRA STV-LC32T410WL (Panel LC320DXJ-SFE1 ).
Main features of SUPRA STV-LC32T410WL device:
Installed matrix (LED panel) LC320DXJ-SFE1 or HV320WX2-206.
To power the backlight LEDs, a converter combined with the KDL32PS618AT main board is used, controlled by the OCP8121 PWM controller. UF730L (TO-252) switches are used as power elements of the LED driver.
The power module is combined with the MainBoard and is made according to the AC / DC flyback voltage converter using FAN6755W (SOIC-7) microcircuits and JCS7N65SB power switches.
MainBoard - the main board (motherboard) is a KDL32PS618AT module, using CPU chips: MSD1306XSEK, Spi Flash: 25Q32, 25X10, Audio: TDA7491LP and others.
Tuner NoName provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DXJ-SFE1
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Glass Depth: 0.50 + 0.50 mm
Contrast Ratio: 1200: 1
Display Colors: 16.7M (6-bit + Dithering)
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
SUPRA LED TV STV-LC32T410WL with LCD display LC320DXJ-SFE1, 32 "(81 cm) 16: 9. operation of LEDs depending on the illumination of areas in the scene.This model uses an LED-panel with an edge arrangement of backlighting LEDs - Edge LED.It is possible to view broadcasts and films and images in high quality HD at a resolution of 1366x768 pixels in the standard graphic resolution 720p (HD Ready) The input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC Graphic processing and digital signal shaping takes place in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p Supported media file formats: MP3, MKV, JPEG.
Speaker power of 10 W (2x5 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, VGA, HDMI x2, USB. A headphone output is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector on the TV case is used, this interface supports resolutions: 640x480, 800x600, 1024x768, 1280x1024, 1360x768. The digital tuner is capable of receiving television channels in DVB-T MPEG4, DVB-T2 standards.
Dimensions: With stand 736x496x180 mm, Without stand 736x444x75 mm.
Attention! The LC320DXJ-SFE1 panel of the SUPRA STV-LC32T410WL LED TV is an expensive and unreliable element.
Do not allow any impacts 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 non-repairable.

Posted By: FRANK at 05:53
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