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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Friday, 24 April 2020

REPAIR / SERVICING TV SHIVAKI STV-48LED15


Technical description and composition of the TV SHIVAKI STV-48LED15, type of panel and applicable modules. The composition of the modules.
SHIVAKI LED
Model: STV-48LED15
Chassis / Version: TP.S512.PC821
Panel: LSC480HN05-B01 // LSC480HN0W01
T-CON: LSC480HN05-B01
LED driver (backlight): integrated into MainBoard
Power Supply (PSU): integrated into MainBoard
PWM Power: NCP1607, LD5530, LD7750
MainBoard: TP.S512.PC821
IC MainBoard: S2T512, GD25Q64BSIG, TPA3110D2
Tuner: R840 & XF-3SDT-H
Technical Specifications STV-48LED15
SHIVAKI STV-48LED15
General repair guidelines for TV LCD LED
Possible malfunctions
- The SHIVAKI STV-48LED15 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or the remote control.
In such cases, the main power source - the AC / DC voltage converter, which is combined with the MainBoard TP.S512.PC821 board, may turn out to be faulty. Includes PFC node on the NCP1607 PWM controller. It is necessary to measure the output voltage of the source, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for the presence of a possible short circuit.
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) NCP1607, LD5530, LD7750, if they do not have visible damage to the case and open short circuit between the terminals, are usually checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
A malfunction is usually most likely in these cases at the backlight nodes of the display matrix. The reason can 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.
To check the LED lines for breaks 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 TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the TP.S512.PC821 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuits and matrix. If necessary, update or replace the software (software). When repairing an MB board, you must check its components S2T512, GD25Q64BSIG, TPA3110D2. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before replacing the R840 tuner, if there is no tuning to the channels, you must 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
We recommend the owners of the STV-48LED15 TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    MainBoard TP.S512.PC821

FIRMWARE FOR SPI FLASH  ----------->   SHIVAKI STV-48LED15, Main: TP.S512.PC821, Panel: LSC480HN05-B01 // LSC480HN0W01

FIRMWARE FOR SPI FLASH  ----------->   SHIVAKI STV-48LED15, Main: TP.S512.PC821, Panel: LSC480HN0W01




The appearance of MainBoard TP.S512.PC821 is shown in the figure below:
TP.S512.PC821
TP.S512.PC821 can be used in TVs:
AKAI LEA-49K40M (Panel LSC490HN04-W), DEXP F48B7000V (Panel LCS480HN07), SHIVAKI STV-48LED15 (Panel LSC480HN05-B01), SHIVAKI STV-49LED17 (Panel LSC490HN03-W), SHIVAKI STV-50LED13 (Panel V500HJ1-PE8), THOMSON T48D16SF-01B (Panel LVF480SSDX E8 V1).
Main features of the SHIVAKI STV-48LED15 device:
Installed matrix (LED-panel) LSC480HN05-B01 or LSC480HN0W01.
The matrix control uses the Timing Controller (T-CON) LSC480HN05-B01.
To power the backlight LEDs, a converter is used, combined with the main board TP.S512.PC821.
The power module is combined with the MainBoard and is designed according to a flyback AC / DC voltage converter using NCP1607, LD5530, LD7750 microcircuits.
MainBoard - the main board (motherboard) is a module TP.S512.PC821, using microchips S2T512, GD25Q64BSIG, TPA3110D2 and others.
The R840 & XF-3SDT-H tuner provides TV reception and channel tuning.
TV SHIVAKI STV-48LED15 with LCD LSC480HN05-B01, diagonal size 48 "(122 cm) 16: 9 format. The required brightness of the screen 320 cd / m² is provided by LED backlight LED. Contrast, as the ratio of maximum brightness to minimum, is 5000: 1. LED TV backlighting is implemented in the technology of manufacturing the screen of this TV model. The design and technical capabilities of the TV provide for viewing broadcasts and films in high quality HD at a resolution of 1920x1080 pixels in a graphical decomposition according to the standard 1080p (Full HD). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA , MPEG4, MKV, JPEG.
The power of the sound system 16 W (2x8 W) provide two speakers. It uses a NICAM stereo signal processing system and Sound Surround.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, VGA, HDMI x3, 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, 1280x1024, 1360x768, 1920x1080.
The digital tuner is capable of receiving television channels in the standards DVB-T MPEG4, DVB-C, DVB-T2, DVB-S2.
Overall dimensions: With stand 1100x698x239 mm, Without stand 1100x647x97 mm.
Mass of the TV: 11.5 kg.
Attention! The LSC480HN05-B01 panel of the SHIVAKI STV-48LED15 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 03:48
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