Technical description and composition of the LG 19LD350 TV, panel type and applicable modules. The composition of the modules.LG
Model: 19LD350
Chassis / Version: LD01A
Panel: M185B1-L02
Lamp backlight: 2 Lamp CCFL
Inverter (backlight): integrated into PSU
Power Supply (PSU): LGP19-10L EAX61391001
PWM Power: ICE3BR1565JF
MainBoard: EAX61524501 (15) // EAX61524502 (0)
IC MainBoard: CPU: UPD78F0513A; Sound: NTP7000; DRAM: K4B1G1646E-HCH9; NAND Flash: H27U1G8F2BTR-BC; SPI Flash: 25Q80; EEPROM: CAT24WC08W
Tuner: TDTJ-S001D EBL60721201
Specifications 19LD350
LG 19LD350
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 19LD350 TV does not turn on and does not show any signs of turning on, does not respond to the control buttons or to the remote control.
Usually with such manifestations, the defect is caused by faulty elements in the main power module LGP19-10L. Then it is necessary to measure its output voltages and, in case of their complete or partial absence, it is necessary to check the serviceability of power switches and rectifier diodes of the converters for a possible short circuit.
In case of breakdowns of semiconductors in the secondary circuits, the converter can usually work abnormally in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM), in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- There is no image, there is sound, it responds to the remote control. Or the image may appear for a second when turned on and immediately disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the EAX61524501 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). In cases of attempts to repair the MB board (SSB), it is necessary to check the health of its elements - CPU: UPD78F0513A; Sound: NTP7000; DRAM: K4B1G1646E-HCH9; NAND Flash: H27U1G8F2BTR-BC; SPI Flash: 25Q80; EEPROM: CAT24WC08W 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).
If the TV works normally from external devices, but does not tune into television channels, the TDTJ-S001D EBL60721201 tuner may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
TV users and owners need to remember that attempts to self-repair a LG 19LD350 TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
Service manual and schematic diagram ------> LG 19LD350 Chassis LD01A.
FIRMWARE SPI FLASH ---------------------------> LG 19LD350 LD01A, Main: EAX61524501 (15).
FIRMWARE SPI FLASH, EEPROM ---------> LG 19LD350 LD01A, Main: EAX61524502 (0), Panel: M185B1-L02
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).
The appearance of the power supply
Main features of the device LG 19LD350:
Installed matrix (LCD-panel) M185B1-L02.
To power the backlight, a converter is used, combined with a power supply.
The necessary supply voltages for all nodes of the LG 19LD350 TV are generated by the LGP19-10L power module, or its analogs using ICE3BR1565JF microcircuits.
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.
Tuner TDTJ-S001D EBL60721201 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: CMO
Model: M185B1-L02
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: TN, Normally White, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 25%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 1.3 / 3.7 (Tr / Td)
Frequency: 60Hz
Lamp Type: 2 pcs CCFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V