Technical description and composition of the LG 22MT47V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 22MT47V 22MT47V-WZ
Chassis / Version: LD51A
Panel: LM215WF3 (SL) (Z2)
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS (TPS40210)
MOSFET LED driver: SMN630LD
Power Supply (PSU): LCAP16A-E Adapter 19V; 1.7A
MainBoard: EAX66166703 (1.0) GJ59Q402UT
IC MainBoard: LGE2133, K4B1G1646G-BCMA, TAS5733, AT24C256C
Tuner: TDJM-G301D
Control: Remote: AKB74475441
Technical Specifications 22MT47V-P
LG 22MT47V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 22MT47V TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
In such cases, the LCAP16A-E power supply is usually faulty.
The owner of the TV can purchase an external power supply unit such as LCAP16A-E and repairing it is not always advisable. In any case, the simplest typical defects characteristic of most IIP schemes can be easily detected and eliminated after opening. It is necessary to measure its output voltages, and in case of their absence (full or partial), it is necessary to check the serviceability of the power switches of the converters and rectifier diodes for the presence of a possible short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during short circuit in the elements of the primary circuit, the mains fuse usually 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, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its 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 EAX66166703 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). In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - LGE2133, K4B1G1646G-BCMA, TAS5733, AT24C256C which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the power supply of the TDJM-G301D tuner and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
Owners and users of the LG 22MT47V 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!
Service manual and schematic diagram LG 22MT47V Chassis LD51A
To reduce the backlight current in LED drivers with a DT1641AS controller (DT1641S), you can increase the total resistance of the resistors from pin 7 (RISET) to the chassis. The exact proportional dependence may not be observed if there is additional control on this input, then the ratings should be selected empirically.
More details on this page
Main features of the device LG 22MT47V:The matrix (LED panel) LM215WF3 (SL) (Z2) is installed.
To power the backlight LEDs, a converter is used, combined with the main board EAX66166703, controlled by the DT1641AS PWM controller (TPS40210). As power elements of the LED driver, keys of the SMN630LD type are used.
To power all the internal components of the LG 22MT47V TV, an external source of the LCAP16A-E Adapter 19V type is used; 1.7A.
MainBoard - the main board (motherboard) is an EAX66166703 module, using LGE2133, K4B1G1646G-BCMA, TAS5733, AT24C256C and other chips.
The TDJM-G301D tuner provides TV reception and channel tuning.