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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Tuesday 17 March 2020

REPAIR / SERVICING TV TCL 26A33H

Technical description and composition of the TV TCL 26A33H, type of panel and applicable modules. The composition of the modules.
TCL
Model: 26A33H
Chassis / Version: 40-MT5362-MAB4XG
Panel: T260XW02 V.P
Lamp backlight: 8 Lamp CCFL
Inverter (backlight): V225-402HF
MainBoard: 40-MT5362-MAB4XG
IC MainBoard: MT8295AE, TDA9886T, TDA1308, 24C16WP
Tuner: TDQG8-601A
Specifications 26A33H
TCL 26A33H
General recommendations for repairing TV LCD
Possible manifestations of defects
- The TCL 26A33H TV does not turn on, does not respond to the remote control and the control panel buttons, does not light up or blink indicators.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of 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 regulators (PWM) IC_Power, 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, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately 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 circuit should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 40-MT5362-MAB4XG 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). When repairing an MB board, you need to check its components MT8295AE, TDA9886T, TDA1308, 24C16WP. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
The TDQG8-601A tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, remind users! Attempts to independently repair the TCL 26A33H TV without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
FIRMWARE FOR    EEPROM 24C16 -----------> TCL 26A33H, Main: 40-MT5362-MAB4XG, Panel: T260XW02 V.P


 The appearance of the MainBoard 40-MT5362-MAB4XG is shown in the figure below:
40-MT5362-MAB4XG
40-MT5362-MAB4XG can be used in TVs:
TCL 26A33H (Panel T260XW02 V.P), THOMSON 46FE9234B (Panel LTA460HA07).
Main features of the TCL 26A33H device:
Installed matrix (LCD panel) T260XW02 V.P.
To power the backlight used inverter V225-402HF.
The necessary supply voltage for all nodes of the TV TCL 26A33H provides a switching power supply.
MainBoard - the main board (motherboard) is a 40-MT5362-MAB4XG module, using chips MT8295AE, TDA9886T, TDA1308, 24C16WP and others.
The TDQG8-601A tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T260XW02 VP
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 (Haze 11%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 6.5 (G to G)
Frequency: 60Hz
Lamp Type: CCFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V


 TCL 26A33H TV with a T260XW02 LCD display, 26 "(66 cm) diagonal size in 16: 9 format. The brightness of the screen declared by the manufacturer, 450 cd / m², is realized by backlighting with fluorescent lamps. Dynamic contrast ratio of 25000: 1 is provided by special control of the backlight operation in depending on the lighting in the plot. You can view images in high quality HD at a resolution of 1366x768 pixels in the standard of graphic decomposition 720p (HD Ready). The input high-frequency or video signal can be processed in analog systems PAL, SECAM, NTSC. Skye processing and formation takes place in the digital signal standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p.
The power of the acoustic system of sound 6 W (2x3 W) provide two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV, component, SCART x2, RGB, VGA, HDMI x3, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
The digital tuner is capable of receiving television channels in DVB-T MPEG4 standards.
The power consumed by the TV in the operating mode from the network is 70 watts.
Overall dimensions: with stand 663x495x202 mm, without stand 663x461x98 mm.
TV mass: without stand: 7.8 kg.
Attention! The T260XW02 V.P panel of the TCL 26A33H LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!
Posted By: FRANK at 07:03
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