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, 30 March 2021

REPAIRING / SERVICING TV TELEFUNKEN TF-LED32S95T2

 Technical description and composition of the TELEFUNKEN TF-LED32S95T2 TV, type of panel and modules used. Module composition.
Composition
Specifications
TELEFUNKEN TF-LED32S95T2
LCD TV LED TF-LED32S95T2 | Year of manufacture: 2019
Screen diagonal: 31.5" (80 cm)
Aspect ratio: 16:9
Resolution: 1366x768
LED backlight: Yes
Support HD: 720p HD
Brightness: 220 cd/m2
Contrast: 3000:1
Viewing Angle: 160°
Pixel response time: 10 ms
Progressive scan: Yes
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 600
Teletext: there is
Multimedia: MP3, WMA, DivX, MKV, JPEG
Sound stereo: there is
Sound power: 16W (2x8W)
Acoustics: two speakers
Interface: AV, HDMI x2, USB
Headphone jack: yes
TV weight:     3.6 kg
Dimensions: with stand 735x475x185 mm
without stand 735x435x75mm
Find out more...
TELEFUNKEN TF-LED32S95T2

TELEFUNKEN LED
Model: TF-LED32S95T2

Chassis/Version: MS36639-ZC01-01

Panel: V320BJ8-Q01-C1

LED driver (backlight): integrated into MainBoard

PWM LED driver: OB3350CP

MOSFET LED driver: TO-252

Power Supply (PSU): integrated into MainBoard

PWM Power: PWM SOT23-6

MOSFET Power: TO-252

MainBoard: MS36639-ZC01-01

IC MainBoard: SPI Flash: 25Q64CSG

MainBoard: DVB-T2 & SAT
General advice about LCD LED TV repair
Possible problems

- TELEFUNKEN TF-LED32S95T2 does not turn on, indicators on the front panel are not glowing or blinking. TV set doesn`t respond on remote control.

The problem in such cases should be looked for in the elements of power supply source - AC/DC converter, which is located on the MainBoard MS36639-ZC01-01. You should measure its output voltages and, in case of their absence, check the power switches (TO-252) and the rectifier diodes for possible short circuits in the converters.
With any breakdown of semiconductors in the secondary circuits, the inverter can usually operate normally in the emergency short-circuit mode. There are no output voltages in this case. And when a short circuit occurs in the power elements of the primary circuit, as a rule, the mains fuse and rarely the current sensor at the source of the switch break down.
Breakdown of power switches (MosFet) in pulse sources is sometimes caused by faults in other circuit elements, for example, in the circuits supplying the PWM controller, frequency-retaining or damping circuits, as well as in the negative feedback (negative feedback) stabilization circuits. PWM regulators (PWM) PWM SOT23-6, if they do not have visible case damage and outright short circuits between pins, are usually checked by replacement.

- No picture, sound, there is, the remote control responds. Or just after switching on for a second the image can appear and then disappear.

Often in such cases there is no backlighting of the LED panel. Often the cause is a faulty LED (breakage, short circuit, etc.), or connectors of the bars (strings), less often faulty is the LED-driver.
It is impossible to check LED strips for breakage without disassembling the panel using multimeter or tester. For this purpose, you need to open all the series-connected PN-junctions and will need a voltage of about tens of volts, and ideally - a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters tend to light up a single 3 volt LED slightly in the forward direction. In the case of twin 6 volt LEDs, the PN junction of its safety regulator may be a good indicator. In faulty LEDs the regulator will either be open or broken in the short circuit.

READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

- The TV does not turn on, the LED indicates standby or operation mode, or blinks.

Repair or diagnosis of the motherboard MS36639-ZC01-01 should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, the software (software) should be updated or replaced. Often the MB board (SSB) has to be replaced if it has complex faults that are hard to detect. If you try to repair it, check its elements - SPI Flash: 25Q64CSG and replace faulty chips with new ones. Some faults may be associated with the use of modern Main Board BGA soldering technology. Usually such defects are detected by local heating of the chip.

Before replacing the DVB-T2 & SAT tuner, if there is no tuning to the channels, you must first check the software and the supply voltage on its pins. Also make sure that the tuner and the processor can communicate via the I2C bus.

Warning to the users! Self repair of your TELEFUNKEN TF-LED32S95T2 without proper skill and experience may result in its complete unrepairable condition.



Finishing up after repairing the backlight. MS36639-ZC01-01, OB3350CP. Information from the master.

Reduce backlight current from 560 mA to 350 mA - removed one of the 1.5 Ohm resistors (PR56) in the current sensor (PR55-PR57) of the driver board MS36639-ZC01-01.


READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.

 
More on MainBoard Repair

The appearance of the MainBoard MS36639-ZC01-01 is shown in the figure below:




MS36639-ZC01-01

Main features of the TELEFUNKEN TF-LED32S95T2:

A matrix (LED panel) V320BJ8-Q01-C1 is installed.
A converter, combined with the main board MS36639-ZC01-01, controlled by the PWM controller OB3350CP, is used to power the backlight LEDs. As the power elements of the LED driver are used as TO-252-type switches.
The power module is combined with MainBoard and is designed as reverse-going AC/DC converter with PWM SOT23-6 chips and TO-252 type power switches.
MainBoard - motherboard is MS36639-ZC01-01 module, with SPI Flash chips: 25Q64CSG and others.
The DVB-T2 & SAT tuner allows you to receive TV programs and tune to channels.


PWM SMPS in SOT-23-6, SOT-26, TSOP-6 packages

In the circuitry of modern switching power supplies (SMPS), PWM controllers made in small-sized planar packages with six terminals have gained wide popularity. The enclosure type designation can be SOT-23-6, SOT-23-6L, SOT-26, TSOP-6, SSOT-6. The appearance and arrangement of the pins are shown in the figure below. In this case, the code marking LD7530A is shown on the left fragment of the picture.


 

 Pin assignment:
1 - GND. (Common wire).
2 - FB. (FeedBack - Feedback). Input for controlling the duration of pulses with a signal from the output voltage. Sometimes it can be labeled COMP (input comparator).
3 - RI / RT / CT / COMP / NC - Depending on the type of microcircuit, it can be used for a frequency-setting RC circuit (RI / RT / CT), or for organizing protection, as an input of a PWM trip comparator at a threshold value at its input, specified in the document. In some types of microcircuits, this input may not be used in any way (NC - No Connect).
4 - SENSE, otherwise CS (Current Sense) - Input from the current sensor at the source of the key.
5 - VCC - Input voltage supply and start of the microcircuit.
6 - OUT (GATE) - Output for controlling the gate (Gate) of the key.

Functionally, these regulators work on the principle of the previously popular xx384x PWM microcircuits, which have proven themselves well in terms of reliability and stability.

Some difficulties often arise when replacing or choosing an analog for such PWM regulators due to the use of code markings in the designation of the type of microcircuits. The situation is complicated by a large number of component manufacturers who do not always provide documentation to the mass access, just as not all manufacturers of finished devices supply repair service centers with diagrams, so repairmen often have to study real circuit solutions by installed components and wiring connections directly on the board.

In practice, PWM microcircuits and the marking code EAxxx and Eaxxx are often found. Official documentation for them was not found in the public domain, but discussions on the forums and pieces of pictures from PDF from System General, which publishes them as SG6848T and SG6848T2, have survived. The drawing is here placed left .


 

For the attention of the masters, here below are PDF datasheet tables compiled from information available on the Internet and PDF documents for the selection of analogues types when replacing the most common six-legged planar PWM with pinout pins: pin1 - GND, pin2 - FB (COMP), pin4 - Sense, pin5 - Vcc, pin6 - OUT ...
Their main difference is the application and purpose of pin 3. 

 

NamePart NumberFabricantMarking
SG6849SG684965TZFairchild / ON SemiBBxx
SG6849SG6849-65T, SG6849-65TZSystem GeneralMBxx EBxx
SGP400SGP400TZ System General AAKxx

 

 PWM controllers (PWM) with a 95-100 kOhm resistor on pin 3.

When applying the PWM listed below, the frequency should be set with the RT (RI) resistor from pin 3 to ground. Usually its nominal value is chosen 95-100 kOhm for a frequency of 65-100 KHz. For more details, see the here below attached documentation. PDF files are packed in RAR.

 

NamePart NumberFabricantMarking
AP3103AAP3103AKTR-G1Diodes IncorporatedGHL
AP8263AP8263E6R, A8263E6VRAiT SemiconductorS1xx
AT3263AT3263S6ATC Technology3263
CR6848CR6848SChip-Rail848H16
CR6850CR6850SChip-Rail850xx
CR6851CR6851SChip-Rail851xx
FAN6602RFAN6602RM6XFairchild / ON SemiACCxx
FS6830FS6830FirstSemi
GR8830GR8830CGGrenergy30xx
GR8836GR8836C, GR8836CGGrenergy36xx
H6849H6849NFHI-SINCERITY
H6850H6850NFHI-SINCERITY
HT2263HT2263MPHOT-CHIP63xxx
KP201
Kiwi Instruments
LD5530LD5530GL LD5530RLeadtrandxxt30 xxt30R
LD7531LD7531GL, LD7531PLLeadtrendxxP31
LD7531ALD7531AGLLeadtrendxxP31A
LD7535/ALD7535BL, LD7535GL, LD7535ABL, LD7535AGLLeadtrendxxP35-xxx35A
LD7550LD7550BL, LD7550ILLeadtrendxxP50
LD7550BLD7550BBL, LD7550BILLeadtrend xxP50B
LD7551LD7551BL/ILLeadtrendxxP51
LD7551CLD7551CGLLeadtrendxxP51C
NX1049XN1049TPXian-Innuovo49xxx
OB2262OB2262MPOn-Bright-Electronics62xx
OB2263OB2263MPOn-Bright-Electronics63xx
PT4201PT4201E23FPowtech4201
R7731R7731GE/PERichtek0Q=
R7731AR7731AGERichtekIDP=xx
SD4870SD4870TRSilan Microelectronics4870
SF1530SF1530LGTSiFirst30xxx
SG5701SG5701TZSystem GeneralAAExx
SG6848SG6848T, SG6848T1, SG6848TZ1, SG6848T2Fairchild / ON SemiAAHxx EAxxx
SG6858SG6858TZFairchild / ON SemiAAIxx
SG6859ASG6859ATZ, SG6859ATYFairchild / ON SemiAAJFxx
SG6859SG6859TZFairchild / ON SemiAAJMxx
SG6860SG6860TYFairchildAAQxx
SP6850SP6850S26RGSporton Lab850xx
SP6853SP6853S26RGB, SP6853S26RGSporton Lab853xx
SW2263SW2263MPSamWin
UC3863/GUC3863G-AG6-RUnisonic Technologies CoU863 U863G
XN1049XN1049, XN1049TPInnuovo Microelectronics49 xxx

 

 PWM controllers that use pin 3 differently.

When using the following PWM (PWM controllers), you should pay attention to pin 3, which can be used to organize protection - thermal or from overvoltage of the input voltage.
The frequency can be fixed at 65kHz, or set by the value of the capacitor at pin 3.
When replacing any microcircuits with analogs, carefully study the documentation. PDF files are packed in a RAR archive.

 

NamePart NumberFabricantMarking
AP3105/V/L/RAP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1Diodes IncorporatedGHN GHO GHP GHQ
AP3105NA/NV/NL/NRAP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1Diodes IncorporatedGKN GKO GKP GKQ
AP3125A/V/L/RAP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1Diodes IncorporatedGLS GLU GNB GNC
AP3125BAP3125BKTR-G1Diodes IncorporatedGLV
AP3125HA/HBAP3125HAKTR-G1, AP3125HBKTR-G1Diodes IncorporatedGNP GNQ
AP31261AP31261KTR-G1Diodes IncorporatedGPE
AP3127/HAP3127KTR-G1, AP3127HKTR-G1Diodes IncorporatedGPH GSH
AP3301AP3301K6TR-G1Diodes IncorporatedGTC
FAN6862FAN6862TYFairchild / ON SemiABDxx
FAN6863FAN6863TY, FAN6863LTY, FAN6863RTYFairchild / ON SemiABRxx
HT2273HT2273TPHOT-CHIP73xxx
LD7510/JLD7510GL, LD7510JGLLeadtrendxxP10 xxP10J
LD7530/ALD7530PL, LD7530GL, LD7530APL, LD7530AGLLeadtrendxxP30 xxxP30A
LD7532LD7532GLLeadtrendxxP32
LD7532ALD7532AGLLeadtrendxxP32A
LD7532HLD7532HGLLeadtrendxxP32H
LD7533LD7533GLLeadtrendxxP33
LD7536LD7536GLLeadtrendxxP36
LD7536RLD7536RGLLeadtrendxxP36R
LD7537RLD7537RGLLeadtrendxxP37R
LD7539C GLLD7539C GLLeadtrendxxP39C
ME8204ME8204M6GMicrOneME8204xx
NCP1250NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1GON Semiconductor25xxxx
NCP1251NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1GON Semiconductor5xxxxx
OB2273OB2273MPOn-Bright-Electronics73xx
R7735R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGERichtek
UC3873/GUC3873-AG6-R, UC3873G-AG6-RUnisonic TechnologiesU873 U873G
 



TELEFUNKEN TF-LED32S95T2 TV with V320BJ8-Q01-C1 LCD screen measuring 31.5" (80 cm) diagonally in 16:9 aspect ratio. The screen luminance of 220 cd/m² is provided by an LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 3000:1. The screen technology of this TV model features LED backlighting.
V320BJ8-Q01-C1 matrix and software MainBoard MS36639-ZC01-01 implement HD image quality at a resolution of 1366x768 pixels in the standard 720p (HD Ready). Supported formats of multimedia files: MP3, WMA, DivX, MKV, JPEG.
The sound system has a capacity of 16 W (2x8 W), provided by two speakers. NICAM STEREO audio processing system is used.
External interface (connection with other devices) is supported by standard inputs and outputs: antenna input (RF), AV, HDMI x2, USB. There is a headphone output. The digital tuner receives DVB-T, DVB-T2, DVB-C TV channels.

The power supply is used as a part of MainBoard.

Dimensions: with stand 735x475x185 mm, without stand 735x435x75 mm.

TV weight: 3.6 kg.

Warning. The V320BJ8-Q01-C1 is an expensive and fragile part of your TELEFUNKEN TF-LED32S95T2 LED TV.
Avoid any kind of impact on the glass and pressure on the surface of the screen to avoid damaging the LED panel!
Also it is not safe to get liquid on the screen. Sometimes one drop is enough if it drips down the glass onto the cables and the TV becomes unrepairable.