ERISSON
Model: 23LK20
Chassis / Version: MST6M58-T6
Panel: LM230WF1 (TL) (F3)
Inverter (backlight): 467-0101-23731G
PWM Inverter: MP1007ES
Power Supply (PSU): 465-01A2-18001G
PWM Power: LD7575
MainBoard: MST6M58-T6
IC MainBoard: MST6M58FQP-LF-Z1, EN25B64-100FIP, FM24C64, A3R12E4JFF, MP1482DS, SA7454
Tuner: CDT-3FP2I2-31
Specifications 23LK20
ERISSON 23LK20
General recommendations for repairing TV LCD
Possible malfunctions
- The ERISSON 23LK20 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.
Most likely in this case, the main switching power supply (IIP) 465-01A2-18001G is faulty. It is necessary to measure the secondary output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the main fuse or current sensor at the source of the key most often 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 LD7575. 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 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 of the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. 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 MST6M58-T6 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 MST6M58FQP-LF-Z1, EN25B64-100FIP, FM24C64, A3R12E4JFF, MP1482DS, SA7454. 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 you suspect a malfunction of the CDT-3FP2I2-31 tuner, first of all, you need to verify the correctness of the software, as well as the presence of the necessary voltage levels and pulses of data exchange with the processor via the I2C bus at the corresponding terminals of the tuner.
Once again, remind users! Attempts to self-repair a TV ERISSON 23LK20 without the appropriate qualifications and the necessary experience can lead to its complete non-repairability!
The appearance of the MainBoard MST6M58-T6 is shown in the figure below:MST6M58-T6
MST6M58-T6 can be used in TVs:
ERISSON 19LK20 (Panel 720p HD 1366x768), ERISSON 20LK15 (Panel 720p HD 1366x768), ERISSON 23LK20 (Panel LM230WF1 (TL) (F3)).
The appearance of the power supply
Main features of the ERISSON 23LK20 device:
Installed matrix (LCD panel) LM230WF1 (TL) (F3).
To power the backlight, an inverter 467-0101-23731G is used, it is controlled by the PWM controller MP1007ES.
The necessary supply voltages for all nodes of the TV ERISSON 23LK20 are formed by the power module 465-01A2-18001G, or its analogs using LD7575 microcircuits.
MainBoard - the main board (motherboard) is an MST6M58-T6 module, using chips MST6M58FQP-LF-Z1, EN25B64-100FIP, FM24C64, A3R12E4JFF, MP1482DS, SA7454 and others.
The tuner CDT-3FP2I2-31 provides the reception of television programs and tuning to channels.
Trademark: ERISSON, Model: 23LK20.
Briefly from the TV: LCD, 1080p Full HD, 23 "(58 cm) diagonal, HDMI: 2, USB.
The composition uses MainBoard MST6M58-T6 and the LCD panel (matrix) LM230WF1 (TL) (F3).
Power Supply Unit (PSU) 465-01A2-18001G Power Supply.
ERISSON 23LK20 TV with LM230WF1 LCD, 23 "(58 cm) diagonal 16: 9 format. The design and technical capabilities of the TV include watching programs and movies in high quality HD at a resolution of 1920x1080 pixels in a graphic resolution of 1080p (Full HD) ). The input high-frequency or video signal can be processed in analogue systems PAL, SECAM, NTSC. Graphic processing and digital signal generation occurs in the standards 480i, 480p, 576i, 576p, 720p, 1080i, 1080p. Supported media file formats: MP3, MPEG4, MKV, JPEG. Real stereo sound using two built-in speakers, NICAM STEREO audio processing system is used.
The external interface (communication with other devices) is supported by standard input and output connectors: antenna input (RF), AV x2, audio x4, S-Video, component, VGA, HDMI x2, USB. An output for connecting headphones is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is used on the TV case, this interface supports resolutions: 640x480, 800x600, 1024x768.
Overall dimensions: With stand 769x536x196 mm, Without stand 392x260x40 mm.
Attention! The LM230WF1 (TL) (F3) panel of the ERISSON 23LK20 LCD TV is its most expensive component.
Avoid hitting the glass and exerting pressure on the screen to avoid permanent damage to the LCD panel!