Technical description and composition of the LG 22LH450V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 22LH450V PZ
Chassis / Version: LD60A
Panel: HM215EUN-SLMP1 - 41XX
LED backlight: EDGE 22MT45 1in1 7020 34PKG LM21911031A VER0.2 (34 LED)
T-CON: 6870S-1577B - LM215WF3-SLK1, (LM215WF3 (SL) (J5)
LED driver (backlight): with integrated Mainboard
PWM LED driver: MP3378E
Power Supply (PSU): Adapter LCAP16A-E
PWM Power: PWM
MainBoard: EAX66873503 (1.2) - RD67551E76
IC MainBoard: LGE6351, 25L8005
Tuner: TDJA-G301D
Control: IR: EBR81968402
Specifications 22LH450V
LG 22LH450V
General repair guidelines for TV LCD LED
If the adapter LCAP16A-E power supply module fails, the external manifestations may be different, for example, the LG 22LH450V does not turn on at all and there is no indication of the indicator lights on the front panel. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is cut off in the power supply, in most cases a breakdown of the power key (s) is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
A breakdown of the power switch of the pulse converter is often triggered by other elements, for example, in the stabilization or control circuits of this switch, as well as by the damper elements in its drain and TPI winding.
If there is no image when you turn on the LG 22LH450V, or it appears and immediately disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the HM215EUN-SLMP1 - 41XX panel, or in the LED node of the driver-converter of their power supply.
Often in the absence of backlighting, disassembling the panel is required. It is necessary to check the serviceability of the transitions of the LEDs, as well as the reliability of the contact connections in the rulers and connectors.
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.
On the motherboard EAX66873503 (1.2) - RD67551E76, in case of a malfunction, you should first check the operation of all the stabilizers and power converters of the microcircuits, and also, if necessary, update the software (software).
In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - LGE6351, 25L8005 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).
The TDJA-G301D tuner malfunction is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Remember! Attempts to self-repair by users of the LG 22LH450V TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
To reduce the backlight current in LED drivers with the MP3378E PWM controller, it is necessary to proportionally increase the total resistance of the resistors from pin 3 (RISET) to the chassis. Calculation of current in milliamperes and resistance in kilo-ohms 977 / Rset for each channel. Parallel channels are summed. For example, for four parallel channels and a RISET 10 KOhm resistance, the total current will be 97.7 * 4 = 391 mA.
The appearance of the MainBoard EAX66873503 is shown in the figure below:EAX66873503
EAX66873503 can be used in TVs:
LG 22LH450V PZ (Panel HM215EUN-SLMP1 - 41XX), LG 24LH450U (Panel V236BJ1-LE2A), LG 28LH451U (Panel HC275EXN-ABVP1-41XX), LG 20MT48VF 20MT48VF-PZ (Panel 1366x768 720p.
Main features of the device LG 22LH450V:
Installed matrix (LED-panel) HM215EUN-SLMP1 - 41XX.
The matrix control uses the Timing Controller (T-CON) 6870S-1577B.
The LED driver with is used to power the backlight LEDs, it is controlled by the MP3378E PWM controller.
To power all the internal components of the LG 22LH450V TV, an external adapter type LCAP16A-E is used using PWM chips.
MainBoard - the main board (motherboard) is an EAX66873503 module, using LGE6351, 25L8005 chips, and others.
The TDJA-G301D tuner provides TV reception and channel tuning.