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, 23 April 2020

REPAIR / SERVICING TV SHIVAKI LCD-2662

Technical description and composition of the TV SHIVAKI LCD-2662, type of panel and applicable modules. The composition of the modules.
SHIVAKI
Model: LCD-2662
Chassis / Version: MST9E19A
Panel: V260B2-L03
Lamp backlight: 4 Lamp CCFL
T-CON: LVDS 8 bit 30 pins
Inverter (backlight): integrated into PSU
PWM Inverter: OZ9926ASN
Power Supply (PSU): KIP072V04-02
PWM Power: Q075R
MOSFET Power: Integrated
MainBoard: MST9E19A
IC MainBoard: MST9E19A-LE
Tuner: AFT1 / 3100G
Technical Specifications LCD-2662
SHIVAKI LCD-2662
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SHIVAKI LCD-2662 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, a malfunction is most likely to be detected in the KIP072V04-02 power module. It is necessary to measure its output voltages and, if they are absent, to check for short circuit probability in the converters power switches (Integrated) and rectifier diodes.
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.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) Q075R, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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 of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the MST9E19A 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). Sometimes they require checking or replacing (if necessary) the elements of the MainBoard board - MST9E19A-LE. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before replacing the AFT1 / 3100G 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 that owners of LCD-2662 TVs contact qualified personnel with the necessary work experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Repair MainBoard
The appearance of the MainBoard MST9E19A is shown in the figure below:
MST9E19A
MST9E19A can be used in TVs:
AKIRA LCT-D19MT02ST (Panel SVA190WX02TB), SHIVAKI LCD-2630 (Panel V260B1-LN1).
Main features of the device SHIVAKI LCD-2662:
The matrix (LCD panel) V260B2-L03 is installed.
The matrix control uses the Timing Controller (T-CON) LVDS.
To power the backlight, a converter is used, combined with a power supply, controlled by the OZ9926ASN PWM controller.
The necessary supply voltages for all nodes of the TV SHIVAKI LCD-2662 are generated by the KIP072V04-02 power module, or its analogs using Q075R microcircuits and Integrated power switches.
MainBoard - the main board (motherboard) is an MST9E19A module, using MST9E19A-LE chips and others.
The AFT1 / 3100G tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CMO
Model: V260B2-L03
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: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 05:27
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