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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Thursday 16 April 2020

REPAIR / SERVICING TV AKIRA LCT-D22V82ST

Technical description and composition of the AKIRA LCT-D22V82ST TV, panel type and applicable modules. The composition of the modules.
AKIRA
Model: LCT-D22V82ST
Chassis / Version: HK-HDMI-MSTV-V5.0 (TV + DVD)
Panel: LM220WE1 (TL) (D1) // LM220WE1 (TL) (D3)
MainBoard: HK-HDMI-MSTV-V5.1
IC MainBoard: MPEG_BOARD V2.1 Laser: HOP1200W-B, FT24C04A, FT24C32A, EN25F40
Tuner: TNJ9355-CF
Technical Specifications LCT-D22V82ST
AKIRA LCT-D22V82ST
General recommendations for repairing TV LCD
Possible manifestations of defects
- AKIRA LCT-D22V82ST does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
In such cases, the fault should be sought first in the power module. It is necessary to measure its secondary output voltage, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for a short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse usually breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power supply, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- 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.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the HK-HDMI-MSTV-V5.1 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - MPEG_BOARD V2.1 laser: HOP1200W-B, FT24C04A, FT24C32A, EN25F40 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before replacing the TNJ9355-CF 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 I2C
Once again, remind users! Attempts to self-repair a TV AKIRA LCT-D22V82ST without the appropriate qualifications and necessary experience can lead to its complete non-repairability!



Repair MainBoard
The appearance of the MainBoard TVM3001103 is shown in the figure below:
TVM3001103
TVM3001103 can be used in TVs:
AKIRA LCT-30KXSTP (Panel V296W1-L14), AKIRA LCT-30KXSTP LCT-30KXSTR (Panel 30 " 1280 x 768).
Main features of the device AKIRA LCT-D22V82ST:
The matrix (LCD panel) LM220WE1 (TL) (D1) or LM220WE1 (TL) (D3) is installed.
The required supply voltage for all components of the TV AKIRA LCT-D22V82ST provides a switching power supply.
MainBoard - the main board (motherboard) is an HK-HDMI-MSTV-V5.1 module, using MPEG_BOARD V2.1 laser chips: HOP1200W-B, FT24C04A, FT24C32A, EN25F40 and others.
The TNJ9355-CF tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LM220WE1-TLD1
Type: a-Si TFT-LCD, Panel
Diagonal size: 22.0 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 473.76x296.1 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V

Trademark: AKIRA, Model: LCT-D22V82ST.
Shortly from the TV: LCD, built-in DVD player, 22 ", 1680x1050, 720p HD, sound: 6 watts.
The composition uses MainBoard HK-HDMI-MSTV-V5.1 and the LCD panel (matrix) LM220WE1 (TL) (D1), or LM220WE1 (TL) (D3).
AKIRA LCT-D22V82ST TV with LCD display LM220WE1 (TL) (D1), diagonal size 22 "(55 cm) 16:10 format. Screen brightness of 300 cd / m² is provided by backlight CCFL (EEFL) lamps. Contrast - ratio of maximum brightness the minimum is at least 700: 1. It is possible to view in high quality HD at a resolution of 1680x1050 pixels in 720p (HD Ready) standard. The input high-frequency or video signal is decoded in analog PAL, SECAM, NTSC systems. Digital signal generation (graphic format) is performed in 480i, 480p, 576i, 576p, 720p, 1080i standards. Multi formats supported Media: MP3, MPEG4, VideoCD, SVCD, JPEG.
The power of the sound system 6 W (2x3 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 x2, S-Video, component, SCART, RGB, VGA, HDMI. A standard VGA (D-Sub 15) connector is used to connect a laptop or computer. This interface supports resolutions: 640x480, 800x600, 1024x768.
Overall dimensions: With stand 731x468x166 mm, Without stand 731x437x87 mm.
Attention! The LM220WE1 (TL) (D1) panel of the AKIRA LCT-D22V82ST LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
Posted By: FRANK at 05:46
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