LG LED
Model: 22MA33V -PZ
Chassis / Version: LD31T
Panel: LC216EXN (SF) (A1)
T-CON: LC216EXN_SFA1
LED driver (backlight): integrated into T-CON
PWM LED driver: BD9472EFV SOP24
MOSFET LED driver: RSD050N10
Power Supply (PSU): Adapter 19V AC / DC
MainBoard: EAX65077504 (1.0) EBU62084511
IC MainBoard: LGE2121-MS A7M4987ZC, 25Q80BVSIG, TNP7513, H5TQ2G63DFR, H5TQ1G63EFR
Tuner: TDSQ-G601D EBL61240503
Specifications 22MA33V
LG 22MA33V
General recommendations for TV LCD LED repair
Possible manifestations of malfunctions
- LG 22MA33V TV does not turn on at all. No response to the remote control and front panel control buttons. Indicator lamps do not light up or flash.
In such cases, the fault should be looked for first of all in the adapter power module.
The owner of the TV set can purchase an external power supply of type Adapter on his own and its repair is not always expedient. In any case, the simplest typical defects characteristic of most SMPS circuits can be easily detected and eliminated after opening. Then we recommend measuring its output voltages and, if they are absent, you should check the serviceability of the power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns in the secondary circuits, the converter, as a rule, can operate in an emergency mode in a short-circuit mode, and in case of a short circuit in the power elements of the primary circuit, the mains fuse is usually cut off.
Mos-Fet power switches used in switching power supplies sometimes fail due to a malfunction of any other elements that can disable it in the key mode, or create an excess of the maximum permissible key parameters. These can be elements supplying a PWM regulator, frequency setting or damper circuits, or elements of negative feedback in the stabilization circuit. PWM controllers, in the absence of visible damage or outright short circuits between the terminals, are checked by replacing them with new ones, or knowingly working properly.
- There is no image, the screen is black, there is sound, sometimes you can see barely noticeable outlines of the image in the ambient light of the screen.
A malfunction is usually in these cases most likely in the backlight units of the display matrix. Usually the cause of the malfunction is in the breakage of the LEDs, or in the connectors of the LED strips, but sometimes the LED driver is also faulty.
It is impossible to detect an open circuit in the LED line without disassembling the panel with a simple multimeter. The LEDs are connected in series and a voltage of several tens of volts is required to open their junctions. Ideally, a current source is suitable for such purposes. You can open the panel and check each LED separately. Usually, Chinese multimeters lightly light one 3-volt LED if you connect the probes to it in the forward direction (red probe to the anode, black to the cathode). For dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of the LED health. In the event of a malfunction of the LED, its zener diode will either be cut off or pierced in the K / Z.
If the LG 22MA33V has no picture, but there is sound, the LCD backlight LC216EXN (SF) (A1) often simply does not work. Moreover, in LED TVs, the LEDs inside the panel usually fail, less often the LED driver.
In such cases, you can see a barely noticeable image with a successful hit of external light on the screen.
Replacing the LEDs requires disassembling the LC216EXN LCD panel - a process that requires experience and qualifications from the master. We do not recommend doing such work on your own to TV owners and craftsmen who do not have experience in repairing LCD panels.
READ HOW TO REPAIR THE TV LED BACKLIGHT --------------> HERE.
If there is no image, and the backlight is on, the screen becomes slightly lighter when turned on, and in an open TV you can see light through the holes in the panel case.
In this case, the panel may also be faulty - damage to strips, loops, for example, as a result of moisture ingress after unsuccessful washing of the screen, the T-CON (Timing Controller) board may be faulty. But the main board MainBoard EAX65077504 often turns out to be faulty, a software failure is also possible.
Then, first of all, you need to check the panel supply voltage, the fuses on the T-CON board, as well as the supply and reference voltages of the column and line drivers - VGH, VGL, Vcom.
If these measurements are within the normal range, it is necessary to trace the passage of LVDS signals from the MainBoard EAX65077504 with an oscilloscope, as well as synchronizing signals to the loops with drivers.
Flooded or unsuccessfully washed screens of LED TVs can be restored, in about half of the cases, usually if significant damage has not formed in the loops and panel strips.
- The TV does not go into operation, does not respond to the remote control. The indicator on the front panel is on or blinking.
Repair or diagnostics of the EAX65077504 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). In cases of complex MB (SSB) repairs and with the necessary skills and equipment, it may sometimes be necessary to replace its chips LGE2121-MS A7M4987ZC, 25Q80BVSIG, TNP7513, H5TQ2G63DFR, H5TQ1G63EFR and other possible faulty components. Malfunctions associated with the use of BGA soldering technologies are usually easily diagnosed by the warm-up method.
If you suspect a malfunction of the TDSQ-G601D EBL61240503 tuner, first of all, you need to make sure that the software is correct, as well as the presence of the required supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Users and owners of TVs should remember that attempts to self-repair the LG 22MA33V TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
DOWNLOAD FIRMWARE FOR SPI FLASH -----------> LG 22MA33V -PZ LD31T, Main: EAX65077504 (1.0) EBU62084511, Panel: LC216EXN (SF)(A1).
Driver current limitation. BD9472EFV LC216EXN_SFA1. General recommendations
To reduce the backlight current in LED drivers with a BD9472EFV controller on the T-CON board, you can increase the total resistance of the resistors from pin 23 (ISET) of the BD9472EFV to the case. The exact proportional relationship may not be observed; the values should be selected empirically.
More details:
BD9472EFV LED-Driver, T-CON 6870S-1619B LC216EXN_SFA1:
In LED drivers with the BD9472EFV chip on the T-CON bar, you can increase the total resistance of the resistors from pin 23 (ISET) of the BD9472EFV to the case. The exact proportional relationship may not be observed, the ratings should be selected empirically.
The drawing was compiled by hand visually from the T-CON bar, there was no documentation for the BD9472EFV on the Internet.
For the LC216EXN (SF) (A1) panel and 6916L-1237A backlight, the current was initially 70 mA in each of the two channels at maximum (a few seconds after switching on without a signal).
After increasing one of the resistors from 91 kOhm to 160 kOhm, the current decreased to 50 mA.
Diodes of standard size 7020, double, but the transitions are connected inside in parallel, therefore - three-volt.
There are 28 LEDs on the bar - two channels of 14 each.
The appearance of the MainBoard EAX65077504 is shown in the figure below:
EAX65077504
EAX65077504 can be used in TVs:
LG 24MN33V PZ (Panel V236BJ1-LE1 Rev.C2), LG 22LN450U 22LN457U (Panel LC216EXN (SF)(A1)), LG 22LN548M (Panel LC216EXN (SF)(A1)).
Main features of the LG 22MA33V device:
The matrix (LED-panel) LC216EXN (SF) (A1) is installed.
Matrix management uses the Timing Controller (T-CON) LC216EXN_SFA1.
An integrated LED driver is used to power the backlight LEDs, controlled by the BD9472EFV SOP24 PWM controller. RSD050N10 keys are used as power elements of the LED driver.
To power all internal components of the LG 22MA33V TV, an external adapter 19V AC / DC is used.
MainBoard - the main board (motherboard) is an EAX65077504 module, using LGE2121-MS A7M4987ZC, 25Q80BVSIG, TNP7513, H5TQ2G63DFR, H5TQ1G63EFR and others.
Tuner TDSQ-G601D EBL61240503 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC216EXN-SFA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 21.6 inch
Resolution: 1366x768, WXGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 477.417x268.416 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit), CIE1931 68%
Response Time: 6 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
LG PANEL V236BJ1-LE1 DATASHEET PINOUT
PANEL VOLTAGE - 12V
PANEL RESOLUTION - 1366H 768V
BIT - 8
V236BJ1-LE1
PIN NO DESCRIPTION
1 VCC 12V
2 VCC 12V
3 VCC 12V
4 VCC 12V
5 GND
6 GND
7 GND
8 NC
9 SELECT LVDS
10 NC
11 GND
12 RX0-
13 RX0+
14 GND
15 RX1-
16 RX1+
17 GND
18 RX2-
19 RX2+
20 GND
21 RXCLK-
22 RXCLK+
23 GND
24 RX3-
25 RX3+
26 GND
27 NC
28 NC
29 NC
30 GND
TV LG 22MA33V with LCD display LC216EXN (SF) (A1), diagonal size 22 "(56 cm) format 16: 9. The required screen brightness of 250 cd / m² is provided by LED backlighting. Dynamic contrast ratio of 5,000,000: 1 is achieved by control LEDs depending on the brightness of the scene.This model uses a panel with an edge arrangement of LEDs in the display backlight - Edge LED.
The LC216EXN sensor and MainBoard EAX65077504 software provide high quality HD viewing at a resolution of 1366x768 pixels in 720p (HD Ready). The input analog video signal is decoded in PAL, SECAM, NTSC systems. Graphic processing of a digital signal is carried out in the standards 480i, 480p, 576i, 576p, 720p, 1080i. Supported media file formats: MP3, WMA, MPEG4, Xvid, DivX, JPEG.
Speaker power of 10 W (2x5 W) is provided by two speakers. The NICAM stereo audio processing system and the Sound Surround function are used.
Communication with other devices via an external interface is supported by standard input and output connectors: antenna input (RF), AV, component, SCART, RGB, VGA, HDMI, USB. A headphone jack is provided. To connect a computer or laptop to this TV model, a VGA (D-Sub 15) connector is provided. This interface supports standard resolutions: 640x480, 800x600, 1024x768, 1360x768. The digital tuner is capable of receiving television channels in the DVB-T, DVB-T2, DVB-C standards.
The TV uses an external adapter.
Dimensions: With stand 513x389x181 mm, Without stand 513x316x63 mm.
Attention! The LC216EXN panel of the LG 22MA33V LED TV is an expensive and unreliable element.
Do not allow any impact on the glass and pressure on the screen surface to avoid damage to the LED panel!
It is also unsafe for liquid to spill onto the screen. Sometimes one drop is enough if it drips down the glass onto the cables to make the TV unrepairable.