Technical description and composition of the AKIRA LCT-32CHSTP TV, panel type and applicable modules. The composition of the modules.AKIRA
Model: LCT-32CHSTP
Chassis / Version: LS-08
Panel: LC320W01 (A6) (K4)
T-CON: 6870C-0021-C
Inverter (backlight): KLS-EE32P-S REV1.2 - 6632L-0189A
Power Supply (PSU): FSP179-4F01
PWM Power: UC3845B, TDA4863G (PFC), TNY266P (Standby), 3843B,
MOSFET Power: 2SK3568
MainBoard: JUJ7.820.171 V1.2
IC MainBoard: MT46V2M32LG-4, TDA8759, SAA7115HL, FLI2310, GM1601, MC14016BDR, SM5301AS, FSAV330M, EL1883L, TDA15063H-N1B, TDA12029-2, TPA3002D2
Tuner: TAD5-C2IP1RW TMI4-C22P2RW
Technical Specifications LCT-32CHSTP
AKIRA LCT-32CHSTP
General recommendations for repairing TV LCD
Possible malfunctions
- The AKIRA LCT-32CHSTP TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
Failure in such cases should be sought in the power supply circuits FSP179-4F01. It is necessary to measure the secondary output voltage, and in case of their absence, check the operability of the power switches (2SK3568) of the converters and rectifier diodes for a 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 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 an excess of the maximum current or voltage. It can be supply, damper circuits, or elements of OOS (negative feedback) stabilization. The reason for the breakdown of the power switch may be PWM (PWM) UC3845B, TDA4863G (PFC), TNY266P (Standby), 3843B ,. It is checked only by replacement with a known good one.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, inverter protection must be disabled. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the JUJ7.820.171 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). When repairing an MB board, you need to check its components MT46V2M32LG-4, TDA8759, SAA7115HL, FLI2310, GM1601, MC14016BDR, SM5301AS, FSAV330M, EL1883L, TDA15063H-N1B, TDA12029-2, TPA3002D2. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
If the TV works normally from external devices, but does not tune into television channels, the tuner TAD5-C2IP1RW TMI4-C22P2RW may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
Owners and users of the AKIRA LCT-32CHSTP 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!
SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> AKIRA LCT-32CHSTP
SCHEMATIC DIAGRAM / PSU ------------------> FSP179-4F01
According to the conditions of compliance with modern world standards for household switching power supplies, the FSP179-4F01 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the TDA4863G PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
Key Features of AKIRA LCT-32CHSTP:
Installed matrix (LCD panel) LC320W01 (A6) (K4).
The matrix control uses the Timing Controller (T-CON) 6870C-0021-C.
To power the backlight used inverter KLS-EE32P-S.
The necessary supply voltages for all components of the AKIRA LCT-32CHSTP TV are generated by the FSP179-4F01 power supply module or its analogs using UC3845B, TDA4863G (PFC), TNY266P (Standby), 3843B microchips, and 2SK3568 type power switches.
MainBoard - the main board (motherboard) is a JUJ7.820.171 module, using the MT46V2M32LG-4, TDA8759, SAA7115HL, FLI2310, GM1601, MC14016BDR, SM5301AS, FSAV330M, EL1883L, TDA15063H-N1B2, T21, TP215, other chips.
Tuner TAD5-C2IP1RW TMI4-C22P2RW provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-A6K4
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 600: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Lamp Type: 20 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
Brand: AKIRA, Model: LCT-32CHSTP.
Shortly from the TV: LCD, 32 ", 1280x768, there is PIP, there is a satellite tuner, sound: 10 W, DVI.
The composition uses MainBoard JUJ7.820.171 V1.2 and the LCD panel (matrix) LC320W01 (A6) (K4).
Power Supply Unit (PSU) FSP179-4F01 Power Supply.
TV AKIRA LCT-32CHSTP with LCD display LC320W01, diagonal size 32 "(81 cm) in 16: 9 format. Screen brightness of 500 cd / m² is ensured by backlight CCFL (EEFL) lamps. Contrast - the ratio of maximum brightness to minimum is at least 550 : 1. The input high-frequency or video signal is decoded in analogue systems PAL, SECAM, NTSC.
The power of the sound system 10 W (2x5W) provides two speakers. The audio processing system NICAM STEREO is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), RGB.
Overall dimensions: With stand 731x468x166 mm, Without stand 731x437x87 mm.
Attention! The LC320W01 (A6) (K4) panel of the AKIRA LCT-32CHSTP LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen surface to prevent permanent damage to the LCD panel.