Technical description and composition of the LG 19LD320 TV, panel type and applicable modules. The composition of the modules.LG
Model: 19LD320 ZA
Chassis / Version: LD91A
Panel: M185B1-L02 Rev. C3
T-CON: M185B1-L01-X + C
Inverter (backlight): integrated into PSU
PWM Inverter: DT8211A
MOSFET Inverter: P2503NPG
Power Supply (PSU): AIP-0187A
PWM Power: STR-W6252, BD961N
MainBoard: EAX60686904 (2)
IC MainBoard: HY27US08121B, HY5PSIG1631C, K4T511630G-HCF7, 25X32VSIG, 24C512, MAX3232C, 24C08WI, MP2305DSIC402, LVC541A, LM324DG
Tuner: TDFW-G235D
Control: AKB69680403
Specifications 19LD320
LG 19LD320
General recommendations for repairing TV LCD
Diagnostics of malfunctions and repairs of the LG 19LD320 ZA, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
AIP-0187A power supply module malfunctions can be expressed in different ways, for example, LG 19LD320 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. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all the power semiconductor elements of the converter and the diode bridge of the rectifier network, as well as the large electrolytic capacitor of the filter of the rectifier network.
The reasons for the breakdown of the power switch in switching power supplies (IIPS) can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the PWM controller chip STRW6252, BD961N or breakage of resistors in its bundle.
Sometimes the LG 19LD320 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit). Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Repair or diagnostics of the EAX60686904 (2) motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, you should update the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Checking or replacing elements HY27US08121B, HY5PSIG1631C, K4T511630G-HCF7, 25X32VSIG, 24C512, MAX3232C, 24C08WI, MP2305DSIC402, LVC541A, LM324DG requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
In the absence of tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltages on the terminals of the TDFW-G235D tuner. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention! For users and owners of 19LD320 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC MANUAL ----> LG CHASSIS : LD91A; Models: 19LD320, 19LD320-ZA, 19LD320N, 19LD320N-ZA
The appearance of the MainBoard EAX60686904 is shown in the figure below:EAX60686904
EAX60686904 can be used in TVs:
LG 32LD320 (Panel T315XW03 V1), LG 32LD320-ZA (Panel T315XW03), LG 32LH4000-ZA (Panel LC320WUN), LG 32LH2000 (Panel LK315T3LA57), LG 32LH2010 (Panel LK315T3LA57), LG 32LF2510 ZB (Panel LC320WUN (SA)(B3)), LG 37LH2000 (Panel LC370WXE (SB)(A1)), LG 19LD320 ZA (Panel M185B1-L02 Rev.C3), LG 26LH2000 (Panel T260XW02 V.R), LG 32LG2100 (Panel LC320WXN), LG 22LH2000 ZA (Panel V216B1-L02), LG 42LH2000 ZA.ARUVLH (Panel LC420WXE (SB)(A1)), LG 32LD321 32LD321-ZB (Panel T315XW03 V1), LG 26LD320 (Panel T260XW04 V.3), LG 19LH2000 19LH2000-ZA (Panel M185B1-L03).
The appearance of the power supply
Main features of the device LG 19LD320:
Installed matrix (LCD panel) M185B1-L02 Rev. C3.
The matrix control uses the Timing Controller (T-CON) M185B1-L01-X + C.
To power the backlight, a converter is used, combined with the power supply, controlled by the DT8211A PWM controller. As power elements of the inverter, keys of the type P2503NPG are used.
The formation of the necessary supply voltages for all nodes of the LG 19LD320 TV is carried out by the AIP-0187A power module, or its analogs using STR-W6252, BD961N microcircuits.
MainBoard - the main board (motherboard) is an EAX60686904 module, using HY27US08121B, HY5PSIG1631C, K4T511630G-HCF7, 25X32VSIG, 24C512, MAX3232C, 24C08WI, MP2305DSIC402, LVC541G, LM chips.
The TDFW-G235D tuner provides TV reception and channel tuning.
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
