Technical description and composition of the LG 22MT55V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 22MT55V 22MT55V-PZ
Chassis / Version: LD41A
Panel: LM215WF3 (SL) (K1)
LED driver (backlight): integrated into PSU
PWM LED driver: DT1641S
MOSFET LED driver: SMK630D
Power Supply (PSU): Adapter 19
MainBoard: EAX65377507 (1.0) EBR78960904 1378
IC MainBoard: LGE2133, MX25L8035E, M24C256, TAS5733
Tuner: TDJM-G101D EBL61400501
Technical Specifications 22MT55V
LG 22MT55V
General repair guidelines for TV LCD LED
Possible manifestations of defects
- LG 22MT55V does not turn on, the indicators on the front panel do not light or flash. The TV does not respond to the control buttons and the remote control.
Failure in such cases should begin to look in the adapter power supply circuits.
The external adapter 19 power supply is not always subject to repair, especially since the owner can purchase it independently. But, in some cases, it makes sense to open it and eliminate the simple typical defects inherent in converters in pulsed sources. In the absence of the necessary supply voltages in the secondary circuits of the converters, it is necessary to check the power switches and rectifier diodes for a possible partial or complete breakdown.
In case of breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short-circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key most often breaks.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM microcircuits are usually checked by replacement with new ones, or obviously working.
- 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
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required. Then it is necessary to open the panel and check each LED separately with a multimeter. If the capabilities of your multimeter do not allow you to open the LED in the forward direction or dual LEd are used, then the PN junction of the emergency zener diode can indirectly serve as a health indicator. In case of LED-a failure, the zener diode PN junction will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the EAX65377507 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). Board repair and replacement of LGE2133, MX25L8035E, M24C256, TAS5733 microcircuits are carried out with the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the TDJM-G101D EBL61400501 tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention to users! Self-repair of the LG 22MT55V TV without the appropriate qualifications and necessary experience can lead to its complete non-repairability!
Service manual and schematic diagram -----------------> LG 22MT55V, 23MT55V, 24MT55V, 22MT55V-PZP, 23MT55V-PZP, 24MT55V-PZP Chassis LD41A .
FIRMWARE SPI FLASH ----------------> LG 22MT55V 22MT55V-PZ LD41A , Main: EAX65377507 (1.0) EBR78960904 1378 , Panel: LM215WF3 (SL)(K1)
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
The appearance of the MainBoard EAX65377507 is shown in the figure below:EAX65377507
EAX65377507 can be used in TVs:
LG 28LB450U ZB (Panel 328041563 Kenmos), LG 24LB450U ZB (Panel V236BJ1-LE2 REV.C1), LG 24MT45V LG 24MT45V-PZ (Panel V236BJ1-LE2 Rev.C1), LG 24LB457U (Panel V236BJ1-LE2 Rev.C1), LG 22MT55V 22MT55V-PZ (Panel LM215WF3 (SL)(K1)), LG 22LB450U (Panel 1366x768 HD).
Main features of the device LG 22MT55V:
The matrix (LED panel) LM215WF3 (SL) (K1) is installed.
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by a DT1641S PWM controller. As power elements of the LED driver, keys of the SMK630D type are used.
To power all the internal components of the LG 22MT55V TV, an external adapter 19 type is used.
MainBoard - the main board (motherboard) is an EAX65377507 module, using chips LGE2133, MX25L8035E, M24C256, TAS5733 and others.
Tuner TDJM-G101D EBL61400501 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LM215WF3-SLK1
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.5 inch
Resolution: 1920x1080, FHD
Display Mode: IPS, Normally Black, Transmissive
Active Area: 476.064x267.786 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 14 (G to G)
Frequency: 60Hz
Lamp Type: 2 strings WLED Without Driver
Signal Interface: LVDS (2 ch, 8-bit), 30 pins
Voltage: 5.0V