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 !

Wednesday, 18 December 2019

REPAIRING / SERVICING TV TELEFUNKEN TF-LED40S6T2

Technical description and composition of the TELEFUNKEN TF-LED40S6T2 TV, panel type and applicable modules. The composition of the modules.
TELEFUNKEN LED
Model: TF-LED40S6T2
Chassis / Version: CV9202H-TPW
Panel: CX400DLEDM
LED driver (backlight): integrated into PSU
PWM LED driver: BIT3260
MOSFET LED driver: AOB254
Power Supply (PSU): CVB42001
PWM Power: LD7535 (PWM SOT23-6 - 36r35)
MOSFET Power: SMK1060
MainBoard: CV9202H-TPW 44T1025H
IC MainBoard: CPU: SPV9202BD (1416-D), DRAM: K4B1G1646G-BCKO, SPI FLASH: Winb25Q64FVSIG, AUDIO: TPA3110LD2
Tuner: ST03WS-2A-E
Technical Specifications TF-LED40S6T2
TELEFUNKEN TF-LED40S6T2
General repair guidelines for TV LCD LED
Possible malfunctions
- TELEFUNKEN TF-LED40S6T2 does not turn on at all and does not show any signs of operability. Does not blink indicators and does not respond to control buttons.
With such manifestations, the CVB42001 power supply module usually fails. Then it is necessary to measure its secondary (output) voltages and, if they are absent, it is necessary to check the serviceability of power switches (SMK1060) and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the 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. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may also be PWM (PWM) LD7535 (PWM SOT23-6 - 36r35). It is checked only by replacement with a known good one.
- 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
The most likely in these cases is a malfunction of the LED backlight. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the CV9202H-TPW 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 attempts to repair the MB (SSB) board, it is necessary to check the health of its elements - CPU: SPV9202BD (1416-D), DRAM: K4B1G1646G-BCKO, SPI FLASH: Winb25Q64FVSIG, AUDIO: TPA3110LD2 which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
Before changing the ST03WS-2A-E tuner, if it is not possible to tune to television channels, make sure that there are supply voltages, which must be measured at the corresponding tuner pins and checked for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.

FIRMWARE SPI FLASH ---------------->  TELEFUNKEN TF-LED40S6T2, Main: CV9202H-TPW 44T1025H, Panel: CX400DLEDM


The appearance of the MainBoard CV9202H-TPW is illustrated in the figure below:
CV9202H-TPW
The CV9202H-TPW can be used in televisions:
AKAI LEA-39J29P (Panel HF390BGA-C1), BBK 32LEM-1001/T2C (Panel CX315DLEDM), DNS M39DM8 (Panel V390HJ1-P02 Rev C1), ERISSON 32LEE17 (Panel 720p HD 1366x768), FUSION FLTV-32T22 (Panel ST3151A05), FUSION FLTV-28T20 (Panel LCM-SM275TK301 (D0306)), FUSION FLTV-28T22 (Panel TH280L321-04), FUSION FLTV-32T23 (Panel ST3151A04-1 / Ver.2.4), FUSION FLTV-32T20 (Panel V320BK1-PS5 Rev.C7), TELEFUNKEN TF-LED40S28T2 (Panel CX400DLEDM), TELEFUNKEN TF-LED29S30T2 (Panel V290BJ1-XC01 CX290DLEDM), TELEFUNKEN TF-LED40S6T2 (Panel CX400DLEDM).
The appearance of food
Main characteristics of the TELEFUNKEN TF-LED40S6T2 device:
Installed matrix (LED panel) CX400DLEDM.
To supply the LEDs for the backlight, a converter is used, associated with a power supply, controlled by a BIT3260 PWM controller. As power elements of the LED driver, keys of type AOB254 are used.
The supply voltages required for all TELEFUNKEN TF-LED40S6T2 TV nodes are generated by the CVB42001 power supply module or its analogs using LD7535 microcircuits (PWM SOT23-6 - 36r35) and SMK1060 type power switches.
MainBoard - the motherboard (motherboard) is a CV9202H-TPW module using processor chips: SPV9202BD (1416-D), DRAM: K4B1G1646G-BCKO, SPI FLASH: Winb25Q64FVSIG, AUDIO: TPA3110LD2, etc.
The ST03WS-2A-E tuner provides television reception and channel tuning.
Posted By: FRANK at 08:34
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