Technical description and composition of the TELEFUNKEN TF-LED32S30T2 TV, type of panel and modules used. Module composition.
Composition Specifications
TELEFUNKEN TF-LED32S30T2
LCD TV LED TF-LED32S30T2 |
Year of manufacture: 2014
Screen diagonal: 31.5" (80 cm)
Screen Format: 16:9
Resolution: 1366x768
Refresh rate: 50Hz
LCD panel type: CX315DLEDM
LED backlight: LED Edge LED
Support HD: 720p HD
Brightness: 250 cd/m2
Contrast: 2400:1
Viewing Angle: 178°
Pixel response time: 8 ms
Progressive scan: Yes
TV Standards: PAL, SECAM, NTSC
Digital tuner: DVB-T, DVB-T2, DVB-C
Number of channels: 1100
Teletext: 1000 page memory.
DTV formats: 480i, 480p, 576i, 576p, 720p, 1080i, 1080p
Multimedia: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG
Audio Stereo: Yes
Sound power: 6W (2x3W)
Acoustics: two speakers
Interface: AV, audio x2, component, VGA, HDMI, USB
Headphone jack: yes
TV weight: 3.5 kg
Dimensions: with stand 729x469x168mm
without stand 729x429x76 mm
Find out more...
TELEFUNKEN TF-LED32S30T2
TELEFUNKEN LED
Model: TF-LED32S30T2
Chassis/Version: CV512H-U42
Panel: CX315DLEDM LE-32Z2
LED driver (backlight): integrated into MainBoard
PWM LED driver: BIT3267
MOSFET LED driver: ME15N10 TO-252
Power Supply (PSU): integrated into MainBoard
PWM Power: PWM SOT23-6
MOSFET Power: TO-252
MainBoard: CV512H-U42
MainBoard IC: SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D)
MainBoard: CDT-9NT372-RD60
General recommendations for LCD LED TV repair
Possible trouble spots
- The TELEFUNKEN TF-LED32S30T2 TV set does not turn on or does not respond to the remote control.
In this case the failure may be the main power supply - AC/DC converter, elements of which in this model are located on the common MainBoard CV512H-U42. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of power keys (TO-252) of converters and rectifier diodes for possible short circuit.
At breakdown of semiconductors in the secondary circuits of any converter, as a rule, it can operate in the short-circuit emergency mode without output voltages, and at short circuit in the elements of the primary circuit most often the line fuse and more rarely the current sensor in the source of the key break immediately.
Breakdown of Mos-Fet switches, used in pulse sources, is often caused by failure of other elements, for example, in PWM regulator supply circuit, in frequency-retaining or damping circuits, as well as in the Negative Feedback Stabilization. PWM chips (PWM) PWM SOT23-6 are usually checked by replacing them with new ones or with ones known to be in good working order.
- No picture, sound is present and all other TV functions are working. When turned on, the picture may sometimes appear for a second.
In some of these cases, the malfunction is caused by the lack of display backlighting. The reason for this may be a break in the circuit of the LEDs, or a problem in the stabilization of their power supply.
Without a special current source it is impossible to check the line of LEDs in series, and it is not safe for them to use any voltage sources over 12v for this purpose. The only thing you have to do is to open the panel and check each LED separately. Usually Chinese multimeters with 9V power supply will light up one 3 volt LED a bit if you connect the probes to it in forward direction, red probe to anode, black probe to cathode. For twin 6-volt LEDs the PN junction of its faulty regulator can be a good indicator. If the LED is faulty, its regulator will either be broken or it will be short-circuited.
If TELEFUNKEN TF-LED32S30T2 has no picture but you have sound, often the backlight of the CX315DLEDM display simply does not work. Moreover, in LED-TVs, usually the LEDs inside the panel fail, less often the LED-driver.
In such cases you can see a faintly visible image when external light hits the screen.
To replace the LEDs requires disassembly of the LCD panel CX315DLEDM - the process requiring a master of experience and expertise. We do not recommend to perform such works by yourself to owners of TV sets and craftsmen who have no experience in LCD panel repair.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
If there is no image, but backlighting works - the screen becomes slightly lighter when the TV is turned on, and in the open TV you can see the light through the holes in the body of the panel.
In this case the panel may be defective - damage to the strips, cables, for example, as a consequence of moisture after an unsuccessful washing of the screen, the T-CON board (Timing Controller) may be defective. But quite often the CV512H-U42 MainBoard is faulty as well and so is the software.
Then first it is necessary to check the panel power supply voltage, fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within normal limits, it is necessary to trace by oscilloscope LVDS signals from MainBoard CV512H-U42, as well as synchronizing signals to driver stubs.
Filled or unsuccessfully washed LED TV screens can be restored in about half of the cases, usually, if there is no significant damage to the panel stubs and slats.
- The LED blinks or lights constantly, the TV set does not turn on, the remote control does not respond.
Repair or diagnosis of the motherboard CV512H-U42 should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, software (software) should be updated or replaced. If there is no possibility of replacing the MB board (SSB), you should check the serviceability of its elements - SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D). Defective components should be replaced.
Before replacing the CDT-9NT372-RD60 tuner, if there is no tuning to the channels, first check the software and the power supply voltages on its outputs. Also make sure that the tuner and the processor can exchange data via the I2C bus.
Once again I would like to remind the users! Trying to repair your TELEFUNKEN TF-LED32S30T2 without proper skill and experience may make your TV completely unrepairable.
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> Chassis CV512H-U42.
Refinement after repair of the backlight. CV512H-U42, BIT3267. Information from the master.
Reduce backlight current from 300 mA to 210 mA - removed one 1.0 Ohm resistor in the backlight current sensor (PR182, PR183, R203, PR238) on the CV512H-U42 board.
Driver current limitation. CV512H-U42, BIT3267S. General Information.
To reduce the backlight current in LED drivers with the BIT3267 controller you have to increase the total resistance of the low resistance current sensor resistors Rset, connected to pin 5 INN of the BIT3267 chip. Usually the LED backlight connector is connected to these.
The total resistance RLed can be calculated from the ratio RLed = 0.21/ILed.
On the V512H-U42 board these are resistors PR182, PR183, R203, PR238 next to diodes PD6 and PD21 (M7).
CV512H-U42 current backlight.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
A pdf document is included ----------> BIT3267.
Many
TV manufacturers are now installing a questionable thermal rating for
the backlight LEDs, which has a negative effect on the longevity of the device.
In half of the cases, LEDs fail after 2-3 years of operation due to
overheating, usually seen by the destroyed phosphor on the body of the
LEDs. The warranty period, as a rule, the LEDs still have time to work out.
Even if the maximum allowable current is within specifications the cooling of LEDs is not always sufficiently efficient,
which can be seen by the traces of overheating, i.e. dark spots on
textolite slats on the back side. And modern LED televisions use diodes
with an external phosphor coating, which after a year or two crumbles
and the crystal directly shines purple. How such a source of ultraviolet
radiation can harm the health of users, no one has yet thought.
Chinese
manufacturers via Aliexpress supplies diodes and LED strips in kits of
any assortment, but the lucky owner of the TV pays for them and for the
repair.
After replacing one or more faulty LEDs, it is useful
to look at the rest carefully, if the phosphor is cracked, it is
advisable to replace all the LEDs. If you measure the voltage
drop on overheated LEDs, it will be slightly higher than that of
adjacent less worn or new LEDs, which indirectly indicates the presence
of a parasitic active resistance (ESR). Further operation of such LEDs
is even more questionable.
If you reduce the current in the
diodes, the power dissipation and the real operating temperature will
decrease, then there is a chance that the old ones will still work.
Ways to limit the current in LED backlight drivers:
There
is a lot of information on the Internet about ways to limit the current
in the LED backlighting for different TVs and LED drivers. A lot of it
is written plausibly but sometimes it is written by people far from
electronics in order to publish any popular content on hot topics to
boost web-sites ratings.
It's impossible to talk about each case
separately within one article, because even similar models may have
different panels and different boards with their own driver variants.
But there are basic principles that are clear to craftsmen with even minimal knowledge and skill.
More on MainBoard Repair
The appearance of the MainBoard CV512H-U42 is shown in the figure below:
CV512H-U42.
The CV512H-U42 can be used in televisions:
DEXP H39D7000Q (Panel LC390TA2A), SUPRA STV-LC32LT0010W (Panel KM0320LDRH0037).
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.
| Name | Part Number | Fabricant | Marking |
|---|---|---|---|
| SG6849 | SG684965TZ | Fairchild / ON Semi | BBxx |
| SG6849 | SG6849-65T, SG6849-65TZ | System General | MBxx EBxx |
| SGP400 | SGP400TZ | 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.
| Name | Part Number | Fabricant | Marking |
|---|---|---|---|
| AP3103A | AP3103AKTR-G1 | Diodes Incorporated | GHL |
| AP8263 | AP8263E6R, A8263E6VR | AiT Semiconductor | S1xx |
| AT3263 | AT3263S6 | ATC Technology | 3263 |
| CR6848 | CR6848S | Chip-Rail | 848H16 |
| CR6850 | CR6850S | Chip-Rail | 850xx |
| CR6851 | CR6851S | Chip-Rail | 851xx |
| FAN6602R | FAN6602RM6X | Fairchild / ON Semi | ACCxx |
| FS6830 | FS6830 | FirstSemi | |
| GR8830 | GR8830CG | Grenergy | 30xx |
| GR8836 | GR8836C, GR8836CG | Grenergy | 36xx |
| H6849 | H6849NF | HI-SINCERITY | |
| H6850 | H6850NF | HI-SINCERITY | |
| HT2263 | HT2263MP | HOT-CHIP | 63xxx |
| KP201 | Kiwi Instruments | ||
| LD5530 | LD5530GL LD5530R | Leadtrand | xxt30 xxt30R |
| LD7531 | LD7531GL, LD7531PL | Leadtrend | xxP31 |
| LD7531A | LD7531AGL | Leadtrend | xxP31A |
| LD7535/A | LD7535BL, LD7535GL, LD7535ABL, LD7535AGL | Leadtrend | xxP35-xxx35A |
| LD7550 | LD7550BL, LD7550IL | Leadtrend | xxP50 |
| LD7550B | LD7550BBL, LD7550BIL | Leadtrend | xxP50B |
| LD7551 | LD7551BL/IL | Leadtrend | xxP51 |
| LD7551C | LD7551CGL | Leadtrend | xxP51C |
| NX1049 | XN1049TP | Xian-Innuovo | 49xxx |
| OB2262 | OB2262MP | On-Bright-Electronics | 62xx |
| OB2263 | OB2263MP | On-Bright-Electronics | 63xx |
| PT4201 | PT4201E23F | Powtech | 4201 |
| R7731 | R7731GE/PE | Richtek | 0Q= |
| R7731A | R7731AGE | Richtek | IDP=xx |
| SD4870 | SD4870TR | Silan Microelectronics | 4870 |
| SF1530 | SF1530LGT | SiFirst | 30xxx |
| SG5701 | SG5701TZ | System General | AAExx |
| SG6848 | SG6848T, SG6848T1, SG6848TZ1, SG6848T2 | Fairchild / ON Semi | AAHxx EAxxx |
| SG6858 | SG6858TZ | Fairchild / ON Semi | AAIxx |
| SG6859A | SG6859ATZ, SG6859ATY | Fairchild / ON Semi | AAJFxx |
| SG6859 | SG6859TZ | Fairchild / ON Semi | AAJMxx |
| SG6860 | SG6860TY | Fairchild | AAQxx |
| SP6850 | SP6850S26RG | Sporton Lab | 850xx |
| SP6853 | SP6853S26RGB, SP6853S26RG | Sporton Lab | 853xx |
| SW2263 | SW2263MP | SamWin | |
| UC3863/G | UC3863G-AG6-R | Unisonic Technologies Co | U863 U863G |
| XN1049 | XN1049, XN1049TP | Innuovo Microelectronics | 49 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.
| Name | Part Number | Fabricant | Marking |
|---|---|---|---|
| AP3105/V/L/R | AP3105KTR-G1, AP3105VKTR-G1, AP3105LKTR-G1, AP3105RKTR-G1 | Diodes Incorporated | GHN GHO GHP GHQ |
| AP3105NA/NV/NL/NR | AP3105NAKTR-G1, AP3105NVKTR-G1, AP3105NLKTR-G1, AP3105NRKTR-G1 | Diodes Incorporated | GKN GKO GKP GKQ |
| AP3125A/V/L/R | AP3125AKTR-G1, AP3125VKTR-G1, AP3125LKTR-G1, AP3125RKTR-G1 | Diodes Incorporated | GLS GLU GNB GNC |
| AP3125B | AP3125BKTR-G1 | Diodes Incorporated | GLV |
| AP3125HA/HB | AP3125HAKTR-G1, AP3125HBKTR-G1 | Diodes Incorporated | GNP GNQ |
| AP31261 | AP31261KTR-G1 | Diodes Incorporated | GPE |
| AP3127/H | AP3127KTR-G1, AP3127HKTR-G1 | Diodes Incorporated | GPH GSH |
| AP3301 | AP3301K6TR-G1 | Diodes Incorporated | GTC |
| FAN6862 | FAN6862TY | Fairchild / ON Semi | ABDxx |
| FAN6863 | FAN6863TY, FAN6863LTY, FAN6863RTY | Fairchild / ON Semi | ABRxx |
| HT2273 | HT2273TP | HOT-CHIP | 73xxx |
| LD7510/J | LD7510GL, LD7510JGL | Leadtrend | xxP10 xxP10J |
| LD7530/A | LD7530PL, LD7530GL, LD7530APL, LD7530AGL | Leadtrend | xxP30 xxxP30A |
| LD7532 | LD7532GL | Leadtrend | xxP32 |
| LD7532A | LD7532AGL | Leadtrend | xxP32A |
| LD7532H | LD7532HGL | Leadtrend | xxP32H |
| LD7533 | LD7533GL | Leadtrend | xxP33 |
| LD7536 | LD7536GL | Leadtrend | xxP36 |
| LD7536R | LD7536RGL | Leadtrend | xxP36R |
| LD7537R | LD7537RGL | Leadtrend | xxP37R |
| LD7539C GL | LD7539C GL | Leadtrend | xxP39C |
| ME8204 | ME8204M6G | MicrOne | ME8204xx |
| NCP1250 | NCP1250ASN65T1G, NCP1250BSN65T1G, NCP1250ASN100T1G, NCP1250BSN100T1G | ON Semiconductor | 25xxxx |
| NCP1251 | NCP1251ASN65T1G, NCP1251BSN65T1G, NCP1251ASN100T1G, NCP1251BSN100T1G | ON Semiconductor | 5xxxxx |
| OB2273 | OB2273MP | On-Bright-Electronics | 73xx |
| R7735 | R7735AGE, R7735HGE, R7735GGE, R7735RGE, R7735LGE | Richtek | |
| UC3873/G | UC3873-AG6-R, UC3873G-AG6-R | Unisonic Technologies | U873 U873G |
The main features of the device TELEFUNKEN TF-LED32S30T2:
A CX315DLEDM LE-32Z2 matrix (LED panel) is installed.
To power the LED backlight is used converter, combined with the main board CV512H-U42, controlled by a PWM controller BIT3267. The ME15N10 TO-252 type switches are used as power elements of LED-driver.
The power module is combined with MainBoard and is designed as reverse-going converter of AC/DC voltage with PWM SOT23-6 chips and TO-252 type power switches.
MainBoard - the main board (motherboard) is a CV512H-U42 module, using SPI Flash: W25Q64, Audio: RDA3118E28 (TPA3110D) and other microcircuits.
The CDT-9NT372-RD60 tuner provides TV program reception and channel tuning.
TELEFUNKEN TF-LED32S30T2 TV with CX315DLEDM LCD screen measuring 31.5" (80 cm) diagonally in 16:9 aspect ratio. The screen luminance of 250 cd/m² is provided by an LED backlight. Contrast, as the ratio of maximum brightness to minimum brightness, is 2400:1. The LED panel of this TV features Edge LED end illumination.
CX315DLEDM matrix and MainBoard CV512H-U42 software realize HD picture quality at 1366x768 pixels resolution in 720p (HD Ready) graphic decomposition standard. Input high frequency or video signal can be processed in PAL, SECAM, NTSC analog systems. Graphical processing and digital signal formation is performed in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, MKV, JPEG.
The speaker system has 6W (2x3W) sound power 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, audio x2, component, VGA, HDMI, USB. There is a headphone output. To connect a computer or laptop to this TV model uses a VGA (D-Sub 15) connector on the TV body, this interface supports resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is able to receive DVB-T, DVB-T2, DVB-C TV channels.
It uses power supply as a part of MainBoard.
Dimensions: with stand 729x469x168 mm, without stand 729x429x76 mm.
TV weight: 3.5 kg.
Warning. The CX315DLEDM is an expensive and fragile part of your TELEFUNKEN TF-LED32S30T2 LED TV.
Do not apply any impact to the glass and do not exert any pressure on the screen surface 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.