Technical description and composition of the LG 24MN33V TV, panel type and applicable modules. The composition of the modules.LG LED
Model: 24MN33V PZ
Chassis / Version: LD31T
Panel: V236BJ1-LE1 Rev. C2
LED driver (backlight): integrated into MainBoard
PWM LED driver: DT1641AS
MOSFET LED driver: AOD478
Power Supply (PSU): Adapter 19V; 2.1A
MainBoard: EAX65077504 (1.0)
IC MainBoard: LGE2121-MS10 (MSD804KKX), H27U1G8F2CTR-BC, AT24C256C, W25Q80BVSSIG, NTP7513, MAX3232CDR
Tuner: TDSQ-G601D (B) EBL61240503
Control: AKB73715639
Technical Specifications 24MN33V
LG 24MN33V
General repair guidelines for TV LCD LED
If the TV does not turn on, no control lights are on or blinking, there are no sounds when you turn on, and there is not the slightest sign of operability - the most likely malfunction is in the power module. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If there is no image when you turn on the LG 24MN33V, or it appears and immediately disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the V236BJ-LE1 Rev.C2 panel, or in the LED node of the driver-converter of their power supply.
In case of breaks in the LED circuit, a complete disassembly of the panel is required, the LEDs are checked for an open circuit, as well as the reliability of the connections in the connectors and rations of the terminals.
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 malfunction, the zener diode PN junction will either be cut off or broken into short-circuit.
In cases of attempts to repair the motherboard EAX65077504 (1.0), it is necessary to check the operability of the linear stabilizers and power converters of its microcircuits and, if possible, update the software (software). BGA chips can sometimes be diagnosed with local heating.
If it is not possible to replace the MB (SSB) card, you need to check the health of its elements - LGE2121-MS10 (MSD804KKX), H27U1G8F2CTR-BC, AT24C256C, W25Q80BVSSIG, NTP7513, MAX3232CDR. Defective components should be replaced.
If a TDSQ-G601D (B) EBL61240503 tuner is suspected, it is first necessary to verify the correctness of the software, as well as the presence of the required power supply voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
Attention to the owners! Attempts to repair the TV LG 24MN33V yourself are not recommended by the manufacturer and can lead to serious negative consequences!
To reduce the backlight current in LED drivers with the 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 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 device LG 24MN33V:
Installed matrix (LED-panel) V236BJ1-LE1 Rev.C2.
To power the backlight LEDs, a converter is used, combined with the EAX65077504 main board, controlled by the DT1641AS PWM controller. As the power elements of the LED driver, keys of the AOD478 type are used.
To power all the internal components of the LG 24MN33V TV, an external adapter 19V type source is used; 2.1A.
MainBoard - the main board (motherboard) is an EAX65077504 module, using chips LGE2121-MS10 (MSD804KKX), H27U1G8F2CTR-BC, AT24C256C, W25Q80BVSSIG, NTP7513, MAX3232CDR and others.
Tuner TDSQ-G601D (B) EBL61240503 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236BJ1-LE1
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 521.471x293.184 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V