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-30KXSTP

Technical description and composition of the AKIRA LCT-30KXSTP TV, type of panel and applicable modules. The composition of the modules.
AKIRA
Model: LCT-30KXSTP
Panel: V296W1-L14
Inverter (backlight): DARFON V144001
PWM Inverter: OZ966G LM394 LM393
MOSFET Inverter: P47AX
Trans Inverter: 4009A453077 684 Om
Power Supply (PSU): AVKXD24V.PCB
PWM Power: MC33260D (PFC), NCP1203P60, NCP1377DR2 (PWM flyback 8pin)
MOSFET Power: STW12NK80Z, FQP7N80
MainBoard: TVM3001103
IC MainBoard: VPC3230D, K4S641632C, PW1230, AD9883A, 29LV800D
Tuner: FI1256MK2
AKIRA
Model: LCT-30KXSTP LCT-30KXSTR
Panel: 30 inch 1280 x 768
Inverter (backlight): V144-001
PWM Inverter: OZ960G
MOSFET Inverter: 4009A449039
Power Supply (PSU): AUKXD24V.PCB
PWM Power: MC33260D (PFC), NCP1203, NCP1377DR2 (PWM flyback 8pin)
MOSFET Power: FQP18N50, FQP7N80
MainBoard: TVM3001103
IC MainBoard: VPC3230D, 24C16, K4S641632C, AD9883A, MAX232A, PW113, 29LV800D
Tuner: FI1256MK2
Technical Specifications LCT-30KXSTP
AKIRA LCT-30KXSTP
General recommendations for repairing TV LCD
Possible malfunctions
- The AKIRA LCT-30KXSTP TV does not turn on at all. The control lights do not light or flash. On the remote control and the buttons on the control panel does not respond.
Often in such cases, the AUKXD24V.PCB power module is faulty. It is necessary to measure the output voltages in the secondary circuits, and if they are absent, check the operability of the power switches (FQP18N50, FQP7N80) 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. PWM microcircuit (PWM) MC33260D (PFC), NCP1203, NCP1377DR2 (PWM flyback 8pin) 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 the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the TVM3001103 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 complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its chips VPC3230D, 24C16, K4S641632C, AD9883A, MAX232A, PW113, 29LV800D and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
The malfunction of the tuner FI1256MK2 is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Attention! Users and owners of LCT-30KXSTP televisions who do not have the appropriate qualifications, knowledge and experience are strongly discouraged from attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    LCT-30KXSTP LCT-15FDL service manyal and schematic diagram



 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).
PSU Advanced
The LCT-30KXSTR model uses the AUKXD24V.PCB power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a step-up converter based on the MC33260D PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
Key Features of AKIRA LCT-30KXSTP:
Installed matrix (LCD-panel) 30 inches 1280 x 768.
To power the backlight, an inverter V144-001 is used, it is controlled by the OZ960G PWM controller. As power elements of the inverter, keys of the type 4009A449039 are used.
The necessary supply voltages for all nodes of the TV AKIRA LCT-30KXSTP are generated by the AUKXD24V.PCB power module or its analogs using MC33260D (PFC), NCP1203, NCP1377DR2 (PWM flyback 8pin) microchips and power switches of the FQP18N50, FQP7N80 type.
MainBoard - the main board (motherboard) is a TVM3001103 module, using VPC3230D, 24C16, K4S641632C, AD9883A, MAX232A, PW113, 29LV800D and other chips.
The tuner FI1256MK2 provides reception of television programs and tuning to channels.


 Brand: AKIRA, Model: LCT-30KXSTP.
Shortly from the TV: LCD, 30 ", 1280x768, there is PIP, sound: 16 W, DVI.
The composition uses MainBoard TVM3001103 and an LCD panel (matrix) 30 inches 1280 x 768.
Power Supply Unit (PSU) AUKXD24V.PCB Power Supply.
AKIRA LCT-30KXSTP TV with 30 "LCD, 30" diagonal size, 16: 9 format. 550 cd / m² screen brightness is provided by CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 600: 1. Input high-frequency or video signal is decoded in analog systems PAL, SECAM, NTSC.
The power of the sound system 16 W (2x8 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, RGB, VGA, DVI.
Overall dimensions: With stand 731x468x166 mm, Without stand 731x437x87 mm.
Attention! The 30-inch 1280 x 768 panel of the AKIRA LCT-30KXSTP 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 05:47
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