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 STV-15L2

Technical description and composition of the TV SHIVAKI STV-15L2, type of panel and applicable modules. The composition of the modules.
SHIVAKI
Model: STV-15L2
Panel: 15 inch
Inverter (backlight): SFP1521E55-ver1.0
PWM Inverter: BIT3193G (16H) PL
MOSFET Inverter: 4511GH (Double Trans)
Power Supply (PSU): Adapter SAWA-01-409 12v / 4A
MainBoard: pa-0153 2tg
IC MainBoard: TDA9381 / C330DG TDA9859
Tuner: TDQ-6F6 / W126D
Control: BT-0426A__CBG
Technical Specifications STV-15L2
SHIVAKI STV-15L2
General recommendations for repairing TV LCD
TV SHIVAKI STV-15L2, like any other, it is advisable to start repairing with an inspection of the internal and external visible physical visual changes. Often, by the external signs and nature of some damage, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting. Experienced repairmen are often aware of the causes of the defect and the possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
If the SHIVAKI STV-15L2 does not turn on, no control lights on the front panel light up or blink, therefore, there is a very high probability of a malfunction of the AC adapter SAWA-01-409 12v / 4A power module. When diagnosing and repairing the AC adapter SAWA-01-409 12v / 4A power supply, the fuse must first be checked, and if it is broken, the power switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
If a breakdown of the power switch of the flyback converter of the power supply unit is detected, it should be remembered that it does not fail without any reasons that should be sought by checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as others semiconductor elements (diodes, transistors, zener diodes).
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
If the SHIVAKI STV-15L2 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
When repairing the SFP1521E55-ver1.0 inverter, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
The motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the power supply circuits of the microcircuits are working, a software update may be necessary. When repairing an MB board, you need to check its components TDA9381 / C330DG, TDA9859. Defective items should be replaced.
Attention to users! Self-repair of a SHIVAKI STV-15L2 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Repair MainBoard
The appearance of MainBoard PA-0157-1TG is shown in the figure below:
PA-0157-1TG
PA-0157-1TG can be used in TVs:
SHIVAKI LCD-2610DVD (Panel 26 inches), SHIVAKI STV-26L2 (Panel SHFA060297641).
Main features of the SHIVAKI STV-15L2 device:
Installed matrix (LCD-panel) 15 inches.
To power the backlight, an inverter SFP1521E55-ver1.0 is used, it is controlled by a BIT3193G PWM controller (16n), pl. As power elements of the inverter, keys of the type 4511GH (double trans) are used.
To power all the internal components of the SHIVAKI STV-15L2 TV, an external adapter type SAWA-01-409 12v / 4A is used.
MainBoard - the main board (motherboard) is a pa-0153 module, using TDA9381 / C330DG TDA9859 chips and others.
The TDQ-6F6 / W126D tuner provides TV reception and channel tuning.
Posted By: FRANK at 05:28
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