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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Saturday 7 March 2020

REPAIR / SERVICING TV SONY KDL-40V4000

Technical description and composition of the SONY KDL-40V4000 TV, panel type and applicable modules. The composition of the modules.
SONY
Model: KDL-40V4000
Chassis / Version: EG1L-L
Panel: LTY400HA06
T-CON: FS HBC2LV2.4
Inverter (backlight): integrated into PSU & SSB400W20S01 Rev0.5
Power Supply (PSU): 1-876-467-12 A-1548231-A
PWM Power: MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV)
MOSFET Power: 2SK3569, 2SK3561, 2SK3934
MainBoard: 1-877-114-11 A-1545-599-A
IC MainBoard: CPU: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE
Control: IR: 1-876-417-11 A-1494-139-A
Technical Specifications KDL-40V4000
SONY KDL-40V4000
General recommendations for repairing TV LCD
Possible manifestations of defects
- The SONY KDL-40V4000 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module 1-876-467-12. It is necessary to measure its output supply voltages, and in case of their absence, check the operability of power switches (2SK3569, 2SK3561, 2SK3934) of converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke the excess of maximum current or voltage values. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, but there is sound, it reacts to the remote control. Or the image appears when you turn it 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.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the motherboard 1-877-114-11 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - CPU: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE and failed chips replace with new ones. Some malfunctions can be associated with the use of BGA soldering technologies in modern Main Board. Typically, such defects are detected by local heating of the chip.
Owners and users of the SONY KDL-40V4000 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-40V4000 Chassis EG1L-L


 The appearance of MainBoard 1-877-114-11 is shown in the figure below:
1-877-114-11
The appearance of the power supply
Main features of the device SONY KDL-40V4000:
Installed matrix (LCD panel) LTY400HA06.
The matrix control uses the Timing Controller (T-CON) FS.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the SONY KDL-40V4000 TV are generated by the power module 1-876-467-12, or its analogs using microchips MIP2H2 (Stb), CXD9841P (PWM), MAX232N (PFC), LX1692BIDW (HV) and power keys of type 2SK3569, 2SK3561, 2SK3934.
MainBoard - the main board (motherboard) is a module 1-877-114-11, using CPU chips: MB90F334A, NAND128W3A28N6, EEPROM: 24C32; RAM: HY825DC256160CE and others.
Additional technical information about the panel:
Brand: S-LCD
Model: LTY400HA06
Type: a-Si TFT-LCD, Panel
Diagonal size: 40 inch
Resolution: 1920x1080, FHD
Display Mode: S-PVA, Normally Black, Transmissive
Posted By: FRANK at 07:37
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