REPAIR / SERVICING TV LG 19LE3300

Technical description and composition of the LG 19LE3300 TV, panel type and applicable modules. The composition of the modules.
LG LED
Model: 19LE3300
Chassis / Version: LD01A
Panel: LC185EXN (SC) (A1)
T-CON: 6870S-1063A
LED driver (backlight): 6870S-1063A (Combined with T-CON)
Power Supply (PSU): 24V adapter
MainBoard: EAX61524501 (15)
IC MainBoard: CPU: UPD78F0513A; Sound: NTP7000; DRAM: K4B1G1646E-HCH9; NAND Flash: H27U1G8F2BTR-BC; SPI Flash: 25Q80; EEPROM: CAT24WC08W
Tuner: TDTJ-S001D
Specifications 19LE3300
LG 19LE3300
General repair guidelines for TV LCD LED
Diagnostics and repair of LG 19LE3300 is recommended to begin with an external examination of the external and internal elements. According to some external signs, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the direction of the troubleshooting. Repair workers are often aware of the causes of the defect and the possible consequences, for example, by ring cracks in the soldering of the outputs of the elements, as well as by swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Malfunctions of the power module - 12V adapter can be expressed in different ways, for example, LG 19LE3300 does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It is sometimes advisable to purchase a new adapter.
The TV may not turn on immediately, but after several attempts to start. In this case, measure the voltage value of 12V and the absence of ripple at the output of the adapter under load. When repairing the power supply, it is advisable to start the diagnostics by checking the mains fuse and the electrolytic capacitors of the filters of the converter secondary rectifiers. In the event of a fuse breaking, the reason should be sought in the power semiconductor elements of the pulse converter of the main power supply. First of all, it is necessary to check the diodes of the bridge of the rectifier of the mains voltage and the power switch (s) of the converter.
If a breakdown of the power switch is detected, it should be remembered that it rarely crashes on its own for no reason that you should look for when checking other elements of the primary circuit - electrolytic capacitors, a PWM controller that can only be checked by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If there is no image when you turn on the TV, but there is sound and other functions work, there is a high probability of a malfunction of the LED driver (power converter for the backlight LEDs of the LC185EXN (SC) panel (A1)). In such cases, you should first check the supply voltage of the 24V LED driver on the Main Board. If this voltage is present, check the operability of the LED driver, which is located on the T-CON board.
Sometimes it may be necessary to disassemble the panel to check the health of the LEDs, as well as the contact connections in the connectors and solders.
To check the LED lines for breaks without disassembling the panel, for example, a current source will help. It is impossible to open series-connected PN junctions with a simple multimeter, a voltage of the order of several tens of volts is required.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software).
Complex repair of the MB board is in some cases possible and practiced by the repairmen. To do this, check and, if necessary, replace the elements, for example, CPU: UPD78F0513A; Sound: NTP7000 and other board chips. BGA chip malfunctions can sometimes be detected by warming up.
Before changing the tuner TDTJ-S001D, if it is not possible to tune to television channels, make sure that there are supply voltages that must be measured at the corresponding terminals of the tuner. Tuner recovery is described in a separate article here.
 Independent repair of LED TV LG 19LE3300 without the appropriate qualifications and certain experience can lead to its complete non-repairability! Be careful!


SCHEMATIC --> LG 19LE3300/3380-ZA, 19LE330N/3400 19LE330N/3400-ZA, 19LE3310 19LE3310-ZB Chassis LD01A

Matrix: LC185EXN (SC)(A1) LG Panel specification LC185EXN (SC)(A1)


  The appearance of the MainBoard EAX61524501 is shown in the figure below:
EAX61524501
EAX61524501 can be used in TVs:
LG 19LE3400 (Panel LC185EXN SC A1), LG 19LE3300 (Panel LC185EXN (SC)(A1)), LG 22LE3300 ZA (Panel LC216EXN (SC)(A1)), LG 19LD350 (Panel M185B1-L02).
Main features of the device LG 19LE3300:
Installed matrix (LED panel) LC185EXN (SC) (A1).
The matrix control uses the Timing Controller (T-CON) 6870S-1063A.
The LED driver 6870S-1063A is used to power the backlight LEDs.
The formation of the necessary supply voltages for all nodes of the LG 19LE3300 TV is carried out by the adapter power module, or its analogues.
MainBoard - the main board (motherboard) is an EAX61524501 module, using CPU chips: UPD78F0513A; Sound: NTP7000; DRAM: K4B1G1646E-HCH9; NAND Flash: H27U1G8F2BTR-BC; SPI Flash: 25Q80; EEPROM: CAT24WC08W and others.
The TDTJ-S001D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC185EXN-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Dithering), CIE1931 68%
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V