Technical description and composition of the TCL U49P6046 TV, panel type and applicable modules. The composition of the modules.TCL LED
Model: U49P6046
Chassis / Version: MT58DU
Panel: LVU485ND1L
LED backlight: YHE-4C-LB4905-YH04J
T-CON: ST4851D03-1-XC-2
LED driver (backlight): integrated into PSU
Power Supply (PSU): 40-LE9226-PWE1CG 08-LE921A6-PW200AA
MainBoard: 40-MT58DU-MAB4HG
IC MainBoard: CPU: MT5658, FLASH: THGBMFG7C1LBAIL
Tuner: DVB + SS07WA-6A-ES
Technical Specifications U49P6046
TCL U49P6046
General repair guidelines for TV LCD LED
Possible malfunctions
- The TCL U49P6046 TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Typically, with such manifestations, the defect is caused by faulty elements in the main power module 40-LE9226-PWE1CG. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet power switches, used in switching power supplies, sometimes fail due to a malfunction of any other elements that can put it out of operation in key mode or create an excess of the maximum permissible parameters of the switch. These can be elements supplying the PWM controller, frequency-setting or damping circuits, or negative feedback elements in the stabilization circuit. PWM controllers, in the absence of visible damage or frank short-circuit between the terminals, are checked by replacing with new, or obviously working.
- There is no image, but there is sound and all the other functions of the TV work. The image sometimes for a second appears immediately after turning on and disappears.
As a rule, in such cases there is no display backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source. Having disassembled the panel, it is necessary to check each LED separately. Chinese multimeters, as a rule, light up a single 3-volt LED in the forward direction. In the case of using dual 6-volt LEDs, the PN junction of its protective zener diode can serve as a health indicator. In faulty LEDs, the zener diode will either be cut off or broken into short-circuit.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 40-MT58DU-MAB4HG 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). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU: MT5658, FLASH: THGBMFG7C1LBAIL. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Before changing the DVB + SS07WA-6A-ES tuner, if it is not possible to tune to television channels, make sure that there are supply voltages that need to be measured on the corresponding tuner pins and check the software for correctness. The pulses of the data exchange of the tuner with the processor can be controlled by an oscilloscope
It should be remembered! Attempts to independently repair the TCL U49P6046 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!
Main features of the TCL U49P6046 device:
Installed matrix (LED panel) LVU485ND1L.
The matrix control uses the Timing Controller (T-CON) ST4851D03-1-XC-2.
To power the backlight LEDs, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the TCL U49P6046 TV is carried out by the 40-LE9226-PWE1CG power supply module, or its analogues.
MainBoard - the main board (motherboard) is a 40-MT58DU-MAB4HG module, using CPU chips: MT5658, FLASH: THGBMFG7C1LBAIL and others.
The DVB + SS07WA-6A-ES tuner provides TV reception and channel tuning.