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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Wednesday 22 April 2020

REPAIR / SERVICING TV ELENBERG LTV-2231

 Technical description and composition of the ELENBERG LTV-2231 TV, panel type and applicable modules. The composition of the modules.
ELENBERG
Model: LTV-2231
Panel: CLAA220WA
Trans Inverter: HUT100
Power Supply (PSU): JSI-220401B
PWM Power: OB2269S (SG6841S)
Mainboard: QINGJLA
IC MainBoard: MST9E19A-LF
Tuner: AFT1 / 3100G
Technical Specifications LTV-2231
ELENBERG LTV-2231
General recommendations for repairing TV LCD
Possible manifestations of defects
- The ELENBERG LTV-2231 TV does not turn on and does not show any signs of turning on. There are no reactions to the control buttons or the remote control.
In most of these cases, the JSI-220401B main switching power supply fails. It is necessary to measure the 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 short circuit in the power 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 chip P22M OB2269S (SG6841S) can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are in good working condition, 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 TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repairing or diagnosing a QINGJLA 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 some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - MST9E19A-LF with new or obviously good ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect a malfunction of the AFT1 / 3100G tuner, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and impulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Attention to users! Self-repair of the ELENBERG LTV-2231 TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!

SCHEMATIC DIAGRAM  / SERVICE MANUAL   ------------------>    ELENBERG LTV-2231

 Main features of the ELENBERG LTV-2231 device:
Installed matrix (LCD-panel) CLAA220WA. A transformer HUT100 is installed in the inverter converter.
The formation of the necessary supply voltages for all nodes of the ELENBERG LTV-2231 TV is carried out by the JSI-220401B power module, or its analogs using OB2269S (SG6841S) microcircuits.
MainBoard - the main board (motherboard) is a QINGJLA module, using MST9E19A-LF chips and others.
The AFT1 / 3100G tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: CPT
Model: CLAA220WA09
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1680x1050, WSXGA +
Display Mode: TN, Normally White, Transmissive
Active Area: 464.94x290.587 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 100%
Response Time: 5 (Tr + Td)
Frequency: 60Hz
Lamp Type: 4 pcs CCFL Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V
Posted By: FRANK at 07:21
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