Technical description and composition of the THOMSON 42M61NF21 TV, panel type and modules used. The composition of the modules.THOMSON
Model: 42M61NF21
Chassis / Version: MT02-DE200
Panel: LC420WU5 (SL) (A2)
T-CON: 6870C-0173B
Inverter (backlight): 6632L-0474A, 6632L-0475A
PWM Inverter: BD9897FS
MOSFET Inverter: 2SK4075
Power Supply (PSU): JCK4338-007
PWM Power: L6563 (PFC 14pin), L6599D, ICE3EB0565, LM339DG
MainBoard: 40-MT02TI-MAB4XG
IC MainBoard: MT8202, 24C32WP, 24C08WP, S29AL016D, V8-L42MT06-LF1V281, 40-MDE200-DIC4XG
Tuner: TEDE9-2C2B
Control: RC1994301
Appearance
THOMSON 42M61NF21
General recommendations for TV LCD repair
Possible manifestations of defects
- THOMSON 42M61NF21 does not turn on, indicators on the front panel do not light or flash. The TV does not respond to control buttons and the remote control.
In such cases, the fault should be looked for primarily in the JCK4338-007 power supply module. Its output voltages should be measured and, in their absence, the serviceability of the power switches and rectifier diodes in the converters should be checked for possible breakdown.
In case of any breakdowns in the secondary circuits, the converter can operate in an emergency mode of a short circuit, and with a short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key often breaks off.
Breakdown of Mos-Fet switches used in switching power supplies is often caused by malfunctions of other elements, for example, in the power supply circuit of the PWM controller, in frequency setting or damper circuits, as well as in negative feedback stabilization. PWM microcircuits (PWM) L6563 (PFC 14pin), L6599D, ICE3EB0565, LM339DG are usually checked by replacing them with new ones, or knowingly working.
- There is no picture, but there is sound, it reacts to the remote control. Or the image appears when turned on and immediately disappears
A defect can be caused by problems in the nodes or elements of the display backlight, or in the power supply of lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, ring the power switches in its converter for breakdown and the secondary windings of the transformers for an open circuit.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protective circuits must be restored immediately after the repair is completed.
- The indicator blinks or is on constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the 40-MT02TI-MAB4XG motherboard should begin with checking the stabilizers and power converters required to power the microcircuits and matrix. If necessary, you should update or replace the software (software). When repairing the MB board, you need to check its components MT8202, 24C32WP, 24C08WP, S29AL016D, V8-L42MT06-LF1V281, 40-MDE200-DIC4XG. Defective elements must be replaced. If chips with BGA soldering technology are used, the problem in its implementation is detected by local heating of the chip.
If you suspect a malfunction of the TEDE9-2C2B tuner, first of all, you need to make sure that the software is correct, as well as the presence of the necessary levels of supply voltages and pulses of data exchange with the processor via the I2C bus on the corresponding terminals of the tuner.
Remember! Attempts to self-repair the THOMSON 42M61NF21 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
DOWNLOAD SCHEMATIC DIAGRAM / SERVICE MANUAL ------------------> THOMSON 42M61NF21 Chassis MT02-DE200
The appearance of MainBoard 40-MT02TI-MAB4XG is shown in the figure below:40-MT02TI-MAB4XG
External view of the power supply
The main features of the THOMSON 42M61NF21 device:
Installed matrix (LCD panel) LC420WU5 (SL) (A2).
Matrix control uses the Timing Controller (T-CON) 6870C-0173B.
The inverter 6632L-0474A is used to power the backlight lamps, it is controlled by the PWM controller BD9897FS. Keys of type 2SK4075 are used as power elements of the inverter.
The formation of the necessary supply voltages for all nodes of the THOMSON 42M61NF21 TV is carried out by the JCK4338-007 power module, or its analogs using L6563 (PFC 14pin), L6599D, ICE3EB0565, LM339DG microcircuits.
MainBoard - the main board (motherboard) is a 40-MT02TI-MAB4XG module, using microcircuits MT8202, 24C32WP, 24C08WP, S29AL016D, V8-L42MT06-LF1V281, 40-MDE200-DIC4XG and others.
The TEDE9-2C2B tuner provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420WU5-SLA2
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 72%
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: EEFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 51 pins
Voltage: 12.0V
