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-26E4000

Technical description and composition of the TV SONY KDL-26E4000, type of panel and applicable modules. The composition of the modules.
SONY
Model: KDL-26E4000
Chassis / Version: EG1L
Panel: T260XW02 V.L
T-CON: T260XW02, T315XW02. VL-T400XW01, 07A83-1C
Inverter (backlight): integrated into PSU
PWM Inverter: LX1692BIDW
MOSFET Inverter: 2SK3569
Power Supply (PSU): 1-876-467-11
PWM Power: MAX232N, CXD9841P, MIP2H2
MOSFET Power: 2SK3934 (PFC), 2SK3561
MainBoard: A1556412A
IC MainBoard: TPA3100D2PHPR, CXB1444R-T6, M24C32
Tuner: BTD-HF411T
Technical Specifications KDL-26E4000
SONY KDL-26E4000
General recommendations for repairing TV LCD
Possible malfunctions
- The SONY KDL-26E4000 TV does not turn on. There are no signs of operability. The indicators on the front panel do not light or flash, the TV does not respond to the remote control and control buttons.
With such manifestations, the power module 1-876-467-11 usually fails. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (2SK3934 (PFC), 2SK3561) and rectifier diodes in the converters for a short circuit.
In case of breakdowns of diodes in the secondary circuits, the converter can operate in emergency short circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback (OOS) stabilization circuits. PWM controllers (PWM) MAX232N, CXD9841P, MIP2H2, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and disappears.
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. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the 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 enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the A1556412A 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 TPA3100D2PHPR, CXB1444R-T6, M24C32 chips and other possible malfunctioning components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the BTD-HF411T tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Owners and users of the SONY KDL-26E4000 TV should 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-26E4000, KDL-32E4000, KDL-40E4000 Chassis EG1L



 The appearance of the MainBoard A1556412A is shown in the figure below:
A1556412A
The appearance of the power supply
Main features of the device SONY KDL-26E4000:
Installed matrix (LCD panel) T260XW02 V.L.
The matrix control uses the Timing Controller (T-CON) T260XW02.
To power the backlight, a converter is used, combined with a power supply, controlled by the LX1692BIDW PWM controller. As power elements of the inverter, keys of the 2SK3569 type are used.
The necessary supply voltages for all nodes of the SONY KDL-26E4000 TV are generated by the power module 1-876-467-11, or its analogs using MAX232N, CXD9841P, MIP2H2 microcircuits and power switches of the 2SK3934 (PFC), 2SK3561 type.
MainBoard - the main board (motherboard) is an A1556412A module, using TPA3100D2PHPR, CXB1444R-T6, M24C32 and other chips.
The BTD-HF411T tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VL
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: VA, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare
Brightness: 500 cd / m²
Contrast Ratio: 2500: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Posted By: FRANK at 02:00
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