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 20 July 2020

REPAIR / SERVICING TV SUPRA STV-LC2626W

Technical description and composition of the SUPRA STV-LC2626W TV, panel type and modules used. The composition of the modules.
SUPRA
Model: STV-LC2626W
Chassis / Version: V2J05
Panel: V260B1-L31
Inverter (backlight): integrated into PSU
PWM Inverter: UBA2071AT
MOSFET Inverter: HFS4N60
Power Supply (PSU): HKLIPS2604-3A Rev: C GP
PWM Power: FAN7530 (PFC), OB2269CP (PWM Flayback)
MOSFET Power: 11N60C3 (PFC), 04N70BI
MainBoard: T.MT8222.8A
IC MainBoard: CPU: MT8222ARMU (BMAL), FLASH: MX25L3205D, HY5DU561622FTP-4
Tuner: TDQ-6F6 / T126CW
Technical Specifications STV-LC2626W
SUPRA STV-LC2626W
General recommendations for TV LCD repair
It is advisable to start repairing a SUPRA TV with a V2J05 chassis with a careful external examination of both internal and external elements. According to some external signs of a change in the state of some elements, it sometimes becomes possible to make assumptions about the nature of the defect, as well as to determine the further direction of troubleshooting. Experienced repairers often guess about the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the element terminals, as well as by swollen capacitors or resistors burned out to coal dust and other external indirect signs.
Malfunctions of the power module can be expressed in different ways, for example, SUPRA STV-LC2626W does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that the processor power regulator (converter) may be faulty with the same external manifestations. The first step is to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse in the power supply is broken, in most cases a breakdown of the power switch (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. You should also check the diodes of the rectifier bridge and the electrolytic capacitor of the mains rectifier filter.
As a rule, switches in switching power supplies (SMPS) are quite reliable and rarely fail without reasons that should be looked for by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM microcircuit is checked by replacing it with a known good one.
In cases where the SUPRA STV-LC2626W TV has lost an image, and the sound is there and all other functions are operational, there is a possibility of an inverter (converter for powering the backlight) malfunction. When you turn on the TV, the image may appear briefly and disappear immediately. It should be borne in mind that with such manifestations, the lamps themselves fail, the malfunction of which can be detected by replacing, connecting for diagnostics to the connectors that are known to be serviceable and suitable in power. When disabling protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all standard protection circuits must be restored.
In cases of attempts to repair the motherboard T.MT8222.8A, it is necessary to check the performance of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). BGA chips can in most cases be diagnosed by local heating. In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - CPU: MT8222ARMU (BMAL), FLASH: MX25L3205D with new or known good ones. In cases where BGA technologies are used, defects are usually localized by heating.
Owners and users of the SUPRA STV-LC2626W TV need to remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
FIRMWARE FOR SPI FLASH  ----------->   SUPRA STV-LC2626W V2J05, Main T.MT8222.8A, Panel: V260B1-L31


 The appearance of MainBoard T.MT8222.8A is shown in the figure below:
T.MT8222.8A
T.MT8222.8A can be used in TVs:
FUSION FLTV-26W4 (Panel V260B1-L31 Ver.426C), SUPRA STV-LC2626W (Panel V260B1-L31).
Main features of the SUPRA STV-LC2626W device:
Installed matrix (LCD panel) V260B1-L31.
A converter combined with a power supply is used to power the backlight lamps, it is controlled by the UBA2071AT PWM controller. HFS4N60 keys are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the SUPRA STV-LC2626W TV is carried out by the HKLIPS2604-3A power module, or its analogs using the FAN7530 (PFC), OB2269CP (PWM Flayback) chips and 11N60C3 (PFC), 04N70BI power switches.
MainBoard - the main board (motherboard) is a T.MT8222.8A module, using CPU chips: MT8222ARMU (BMAL), FLASH: MX25L3205D, HY5DU561622FTP-4 and others.
The TDQ-6F6 / T126CW tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V260B1-L31
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 3/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
SUPRA STV-LC2626W LCD TV with V260B1-L31 LCD, 26 "(66 cm) diagonal 16:10 format. Screen brightness of 300 cd / m² is provided by CCFL (EEFL) fluorescent lamps. Contrast is the ratio of maximum brightness to a minimum of 2000: 1. The capabilities of the TV provide viewing of broadcasts and movies in high quality HD at a resolution of 1920x1200 pixels in graphic decomposition at the standard 1080p (Full HD) .Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC. Graphic processing and digital signal formation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the sound system 16 W (2x8 W) provides 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 x3, S-Video, component, SCART x2, RGB, VGA, HDMI x2. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, use the VGA (D-Sub 15) connector on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The power consumed by the TV in operating mode from the network is 160 watts.
Overall dimensions: 579x434x210 mm.
The mass of the TV: 13.2 kg.
Attention! SUPRA STV-LC2626W LCD TV panel V260B1-L31 is the 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 05:52
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