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, 11 March 2020

REPAIR / SERVICING TV SONY KLV-V40A10

Technical description and composition of the SONY KLV-V40A10 TV, panel type and applicable modules. The composition of the modules.
SONY
Model: KLV-V40A10
Chassis / Version: MIX5
Panel: LTY400W2-L06
T-CON: 400W2C4LV2.5
Inverter (backlight): integrated into PSU
PWM Inverter: BD9886FV, UF4005 / 23, BA10339F-E2
MOSFET Inverter: 2SK3797
Power Supply (PSU): 1-866-356-12 GI2
PWM Power: CXD9841M, FA5501N-TE1 (PFC), STR-A6169 (Standby)
MOSFET Power: 2SK3563, 2SK3934 (PFC)
MainBoard: 1-867-499-15 & 1-867-500-21 AL, TGL, QG, B, K Boards
IC MainBoard: CXA20690, CXA21810, MSP4411K, SAA5665HL / M1 / 0724
Tuner: BTF-BG402, BTF-BG412 TLG
Control: IR: 1-867-508-11 (172624811)
Technical Specifications KLV-V40A10E
SONY KLV-V40A10
General recommendations for repairing TV LCD
Possible malfunctions
- The SONY KLV-V40A10 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Failure in such cases should begin to be sought in the power supply circuits 1-866-356-12. It is necessary to measure its output voltages, and in case of their absence, check the operability of power switches (2SK3563, 2SK3934 (PFC)) of converters and rectifier diodes for a short circuit probability.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode, or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers CXD9841M, FA5501N-TE1 (PFC), STR-A6169 (Standby), in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- 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.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits 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 1-867-499-15 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - CXA20690, CXA21810, MSP4411K, SAA5665HL / M1 / 0724. Defective components should be replaced.
Before changing the tuner BTF-BG402, BTF-BG412 TLG, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured at the corresponding terminals of the tuner and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, remind users! Attempts to self-repair a SONY KLV-V40A10 TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
 Service manual / schematic diagram --------------->   Sony KLV-V26A10, KLV-V32A10, KLV-V40A10 / MIX5 CHASSIS

  Service manual / schematic diagram --------------->   Sony KLV-V40A10 MIX5 1-866-356-12, 1-866-356-13

( Service Manual with Schematic Diagram 100 pages of 2005 for  the KLV-V40A10E, KDL-V40A12U)




 The appearance of MainBoard A2E is shown in the figure below:
A2E
A2E can be used in TVs:
SONY KDL-S32A12U (Panel LTY320W2-L02), SONY KLV-S26A10E (Panel LTY260W2-L06).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, module 1-866-356-12 provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the FA5501N-TE1 PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the device SONY KLV-V40A10:
Installed matrix (LCD panel) LTY400W2-L06.
The matrix control uses the Timing Controller (T-CON) 400W2C4LV2.5.
To power the backlight lamps, a converter is used, combined with a power supply unit, controlled by a BD9886FV, UF4005 / 23, BA10339F-E2 PWM controller. As power elements of the inverter, keys of the 2SK3797 type are used.
The necessary supply voltages for all nodes of the SONY KLV-V40A10 TV are generated by the power module 1-866-356-12, or its analogs using microcircuits CXD9841M, FA5501N-TE1 (PFC), STR-A6169 (Standby) and power switches of the type 2SK3563, 2SK3934 (PFC).
MainBoard - the main board (motherboard) is a module 1-867-499-15, using microcircuits CXA20690, CXA21810, MSP4411K, SAA5665HL / M1 / 0724 and others.
Tuner BTF-BG402, BTF-BG412 TLG provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY400W2-L06
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1366x768, WXGA
Display Mode: S-PVA, Normally Black, Transmissive
Posted By: FRANK at 03:01
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