Technical description and composition of the LG 32LB1R TV, panel type and applicable modules. The composition of the modules.LG
Model: 32LB1R
Chassis / Version: ML-051B
Panel: LC320W01-SL11
Lamp backlight: 18 Lamp EEFL
Inverter (backlight): YPNL-T009A (S) Rev 3.0 6632L-0207B LC320W01
Power Supply (PSU): YP2632T -2 REV 1.0
PWM Power: FAN7601, I3002FL
MOSFET Power: W20NM60, P9NK60Z, P7NK80ZFP
MainBoard: 68709M0045D ML-051B
IC MainBoard: FLI8532-LF & FLI8125-LF, EEPROM: 24C32WP & 24C256W, FLASH: SST25VF040 & MX 29LV160BTTC-70
Tuner: TAFM-W101P, TAFM-W102P
Appearance
LG 32LB1R
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 32LB1R TV does not turn on at all. The control lights do not light or flash. The TV on the remote control and the control panel buttons do not respond.
Most likely in this case, the main switching power supply (IIP) YP2632T is faulty. 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 (W20NM60, P9NK60Z, P7NK80ZFP) and rectifier diodes of the converters for a possible short circuit.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually 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) FAN7601, I3002FL, 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, all other functions of the TV work. When turned on, the image may sometimes appear for a second.
The defect can be caused by problems in the nodes or elements of the backlight of the display, or in the power supply of the lamps or the inverter.After checking all the electrolytic capacitors of the filters that are involved in the power supply to the inverter, you must ring in its converter power keys for breakdown and secondary windings of transformers for an open.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The TV does not turn on, the indicator indicates standby or operating mode, or blinks.
Repair or diagnostics of the 68709M0045D 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). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements FLI8532-LF & FLI8125-LF, EEPROM: 24C32WP & 24C256W, FLASH: SST25VF040 & MX 29LV160BTTC-70. BGA chip malfunctions are usually easy to detect 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 voltage at the terminals of the tuner TAFM-W101P, TAFM-W102P. 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.
TV users and owners need to remember that attempts to self-repair an LG 32LB1R TV without the appropriate qualifications and necessary experience can lead to serious negative consequences!
FIRMWARE SPI FLASH, EEPROM -----> LG 32LB1R, Main: 68709M0045D ML-051B, Panel: LC320W01-SL11
The appearance of MainBoard 68709M0045D is shown in the figure below:68709M0045D
The appearance of the power supply
Main features of the device LG 32LB1R:
Installed matrix (LCD panel) LC320W01-SL11.
To power the backlight used inverter YPNL-T009A.
The necessary supply voltages for all nodes of the LG 32LB1R TV are generated by the YP2632T power module or its analogs using FAN7601, I3002FL microchips and power switches of the type W20NM60, P9NK60Z, P7NK80ZFP.
MainBoard - the main board (motherboard) is a module 68709M0045D, using chips FLI8532-LF & FLI8125-LF, EEPROM: 24C32WP & 24C256W, FLASH: SST25VF040 & MX 29LV160BTTC-70 and others.
Tuner TAFM-W101P, TAFM-W102P provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SL11
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V