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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday, 6 March 2020

REPAIR / SERVICING TV SONY KDL-26V4000

Technical description and composition of the TV SONY KDL-26V4000, type of panel and applicable modules. The composition of the modules.
SONY
Model: KDL-26V4000
Chassis / Version: NEX
Panel: LTA260AP01 Y01
Inverter (backlight): INV26S10A
PWM Inverter: OZ9966SN (24pin)
MOSFET Inverter: AOD486A
Power Supply (PSU): 1-876-635-11 - A1556796A GA2
PWM Power: MCZ3001DB (18pin), MIP2H2 (8pin)
MainBoard: 1-875-656-22 - Y2008460K - A1544037K
IC MainBoard: MB90F334, K9F5608U0D, CXB1444R, TPA3100D2
Tuner: BTF-HF412T
Technical Specifications KDL-26V4000
SONY KDL-26V4000

General recommendations for repairing TV LCD
Repair SONY KDL-26V4000 must begin with the diagnosis of the malfunction and a thorough inspection of its external and internal components, including those of the body. Many visible signs make it possible to determine the future direction of troubleshooting and localization of the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
In the absence of any signs of operability, when the SONY KDL-26V4000 does not turn on and does not signal anything with the control lights on the panel, the GA2 M1526430A power supply module is most likely faulty. When diagnosing and repairing the GA2 M1526430A power supply, it is first necessary to check the fuse, and if it breaks, 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, PWM controller MCZ3001DB (18), MIP2H2 (8), which You can check only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
If the SONY KDL-26V4000 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
It should be remembered that when the protection is turned off, there is always a risk of failure of the power elements of the inverter during diagnosis. After repair, it is necessary to restore all standard converter protection circuits.
Before replacing the BTF-HF412T tuner, if there is no tuning for the channels, you must first check the supply voltage at its terminals, including the varicap supply (30-33V).
Owners and users of the SONY KDL-26V4000 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual / schematic diagram ------------------->   Sony KDL-26V4000, KDL-32V4000, KDL-37V4000 CHASSIS SE2AG

PSU  schematic diagram ------------------->   Sony 1-876-635-12, 1-876-635-11 Power supply


 The appearance of MainBoard 1-875-656-22 is shown in the figure below:
1-875-656-22
1-875-656-22 can be used in TVs:
SONY KDL-26V4000 (Panel LTA260AP01 Y01), SONY KDL-37V4500 (Panel T370XW02 V.C), SONY KDL-32V4500 (Panel LTZ320AA01).
The appearance of the power supply
Main features of the device SONY KDL-26V4000:
Installed matrix (LCD-panel) LTA260AP01 Y01.
The INV26S10A inverter is used to power the backlight, controlled by the OZ9966SN PWM controller (24pin). As power elements of the inverter, keys of the AOD486A type are used.
The necessary supply voltages for all nodes of the SONY KDL-26V4000 TV are generated by the power module 1-876-635-11, or its analogs using microchips MCZ3001DB (18pin), MIP2H2 (8pin).
MainBoard - the main board (motherboard) is a module 1-875-656-22, using microchips MB90F334, K9F5608U0D, CXB1444R, TPA3100D2 and others.
The BTF-HF412T tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: SAMSUNG
Model: LTA260AP01
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: APVA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 14%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 2000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 5 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 02:42
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