Technical description and composition of the TV AKAI LES-32A64M, type of panel and modules used. Module composition.
AKAI LED.
Model: LES-32A64M
Chassis/Version: TP.MS338E.PB803
Panel: LSC320AN09 D00
LED driver (backlight): integrated into MainBoard
PWM LED driver: PWM SOT23-6
Power Supply (PSU): integrated into MainBoard
PWM Power: OB2273 (PWM SOT23-6)
MOSFET Power: TK5P65W 650V5.2A TO-252
MainBoard: TP.MS338E.PB803
IC MainBoard: CPU: MSB102KT, eMMC: THGBMDG5D1LBAIL, SPI Flash: 25L4006E
CPU: CDT-9NT372
Specifications LES-32A64M
AKAI LES-32A64M
General recommendations for LCD LED TV repair
Possible defects
- AKAI LES-32A64M does not turn on and does not show any signs of working at all. Does not flash the lights and does not respond to the control buttons.
First of all in such cases you should check the operability of the common switching power supply (PPS) - AC/DC mains voltage converter. All power supply elements in this TV model are located on the MainBoard TP.MS338E.PB803. It is necessary to measure the output voltages in its secondary circuits, and in case of their full absence you should check the serviceability of the power switches (TK5P65W 650V5.2A TO-252) and the rectifier diodes on the possible breakdown (short circuit).
If the semiconductors in the secondary circuits breakdown, the inverter can usually be short-circuited, and the mains fuse is often blown when the power elements in the primary circuit are shorted.
Mos-Fet switches used in switching power supplies usually fail due to the failure of other elements that can take it out of key mode, or cause it to exceed the maximum current or voltage. These may be the circuits feeding the PWM controller, the damping or frequency-retaining circuits, or the negative feedback elements in the stabilization circuit. PWM controllers OB2273 (PWM SOT23-6), if there are no external damages and short circuits between pins, are checked by replacing with known good ones.
- No picture, sound is present and all other TV functions work. When switching on, the picture can sometimes appear for a second.
Often in such cases there is no backlighting of the LED panel. Usually the cause of the fault is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED-driver is also faulty.
It is better to use a power supply with a maximum voltage of 200V to check if the LEDs are working. It is not recommended to use any voltage sources for this purpose. You can check each LED individually with a simple Chinese multimeter (9 volt) in P-N junction test mode. If you connect the red probe of the multimeter to the anode of the LED and the black to its cathode, then the 3 volt LED will light up slightly and in the opposite direction you will find the faulty junction of the stabilizer. The functionality of the PN junction is indirectly an indication of the functionality of the LED.
- The TV set doesn't turn on, the LED indicates standby or operation mode, or blinks.
Repair or diagnostic of the TP.MS338E.PB803 motherboard should begin with checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (firmware). Complex repair of MB (SSB) is possible only in the conditions of the service center with the necessary equipment. Check or replacement of CPU: MSB102KT, eMMC: THGBMDG5D1LBAIL, SPI Flash: 25L4006E requires the necessary training and professional skills to repair modules at the component level. Problems associated with the use of BGA soldering technology can sometimes be diagnosed by the heating method.
If there is no TV channel reception, but the TV set is working properly from external devices, first of all you should check the CDT-9NT372 tuner supply voltage and update the software. It is necessary to check the I2C bus communication pulses with an oscilloscope.
If the AKAI LES-32A64M has no picture but has sound, often the HV320WHB-N5K display backlight simply does not work. Moreover, in LED TVs the LEDs inside the panel usually 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 HV320WHB-N5K LCD panel, a process that requires a master of experience and skill. 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 MainBoard TP.MS338E.PB803 is also defective, so software defects are also possible.
Then first it is necessary to check the panel power supply voltage, the 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, you need to trace by oscilloscope the LVDS signals from MainBoard TP.MS338E.PB803, as well as synchronizing signals to driver stubs.
Filled or badly washed LED TV screens can be repaired in about half of the cases, usually, if there is no significant damage in the cables and panel bars.
Remember! Attempts to repair TV AKAI LES-32A64M by yourself, in the absence of the necessary skills and experience, is categorically not recommended and is fraught with negative consequences, up to the complete unrepairable device!
To reduce the backlight current from 290 mA to 230 mA you can remove the 1,6 Ohm resistor in the current sensor (E8303 assembly) on the TP.MS338E.PB803 board.
More on MainBoard repair
The appearance of the MainBoard TP.MS338E.PB803 is shown in the figure below:
TP.MS338E.PB803
The main features of the device AKAI LES-32A64M:
A matrix (LED panel) LSC320AN09 D00 is installed.
The backlight LEDs are powered by a converter combined with the main board TP.MS338E.PB803, controlled by a PWM SOT23-6 controller.
The power supply module is integrated into the MainBoard and follows the reverse-going AC/DC converter circuit using OB2273 (PWM SOT23-6) chips and TK5P65W 650V5.2A TO-252 type power switches.
MainBoard - the main board (motherboard) is a TP.MS338E.PB803 module, using CPU: MSB102KT, eMMC: THGBMDG5D1LBAIL, SPI Flash: 25L4006E and others.
The CDT-9NT372 tuner provides television program reception and channel tuning.
More technical information about the panel:
Brand : SAMSUNG
Model : LSC320AN09
Type : a-Si TFT-LCD, CELL
Diagonal size : 31.5 inch
Resolution : 1366x768, WXGA
Display Mode : SVA, Normally Black, Transmissive
Active Area : 697.685x392.256 mm
Surface : Antiglare (Haze 2%), Hard coating (2H)
Glass Depth : 0.50+0.50 mm
Transmissivity : 6.9 % (with Polarizer)
Contrast Ratio : 4000:1
Display Colors : 16.7M (8-bit), sRGB 68%
Response Time : 20 (G to G)
Frequency : 60Hz
Signal Interface : LVDS (1 ch, 8-bit), 30 pins
Voltage : 12.0V
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 |
AKAI LES-32A64M LCD TV set with the HV320WHB-N5K, which measures 32" (81 cm) diagonally in 16:9 aspect ratio. The model's display technology uses LED backlighting.
LCD panel HV320WHB-N5K and software MainBoard TP.MS338E.PB803 provide HD image quality at 1366x768 pixels in 720p (HD Ready).
The TV model LES-32A64M has built-in SMART software and pre-installed the Android operating system. Connection to the network can be made via Wi-Fi wireless connection. Supported media formats: MP3, MPEG4, MKV, JPEG.
Two speakers provide sound power of 12 W (2x6 W). NICAM STEREO audio processing system is used.
External interface (connection to other devices) is supported by standard inputs and outputs: antenna input (RF), AV, component, VGA, HDMI x3, USB, Ethernet (RJ-45), Wi-Fi. There is a headphone output. The digital tuner is capable of receiving DVB-T, DVB-T2, DVB-C television channels.
The TV set uses the power supply as part of the MainBoard.
Overall dimensions: with stand 730x465x230 mm, without stand 730x435x85 mm.
TV weight: with stand 4.14 kg, without stand 4.03 kg.
Warning. The HV320WHB-N5K LED TV AKAI LES-32A64M panel is an expensive and unreliable component.
Avoid any kind of impact on the glass and 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.