Technical description and composition of the LG 37SL8000 TV, panel type and applicable modules. The composition of the modules.LG
Model: 37SL8000
Chassis / Version: LD91K
Panel: LC370WUD (SB) (M3)
T-CON: 6870C-0264B 4L
Inverter (backlight): PPW-CC37SS-M (A) REV1.0 6632L-0592A, PPW-CC37SS-S (A) REV1.0 6632L-0593A
Power Supply (PSU): PSLL-T805A EAY58476001 2300KPG084A-F
MainBoard: EAX60890803 LD91K EAX60890803 (1)
IC MainBoard: LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L
Tuner: TDVW-H103F
Control: IR: EAX61195902 (1)
Specifications 37SL8000
LG 37SL8000
General recommendations for repairing TV LCD
Possible malfunctions
- The LG 37SL8000 TV does not turn on and does not show any signs of turning on, it does not respond to the control buttons or to the remote control.
Often in such cases, the PSLL-T805A power supply module is faulty. It is necessary to measure its output voltages, and in case of their absence, check the operability of the power switches of the converters and rectifier diodes for the probability of a short circuit.
In case of any breakdown of semiconductors in the secondary circuits, the converter can usually work normally in emergency short circuit mode. There are no output voltages. And with a short circuit in the power elements of the primary circuit, as a rule, the mains fuse breaks and less often the current sensor at the source of the key.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM), if they do not have visible damage to the chassis and open short circuit between the terminals, are usually checked by replacement.
- 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.
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 indicator on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the EAX60890803 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). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L and replace the failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
If a TDVW-H103F tuner is suspected of malfunction, first of all, it is necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
It should be remembered! Attempts to self-repair the LG 37SL8000 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
schematic diagram -------------> LG 37SL8000 Chassis LD91K
FIRMWARE SPI FLASH LG 37SL8000 LD91K, Main: EAX60890803 LD91K EAX60890803 (1), Panel: LC370WUD (SB)(M3).
The appearance of the MainBoard EAX60890803 is shown in the figure below:EAX60890803
EAX60890803 can be used in TVs:
LG 42SL8000 (Panel LC420WUD (SB)(M4)), LG 37SL8000 (Panel LC370WUD (SB)(M3)).
Main features of the device LG 37SL8000:
Installed matrix (LCD panel) LC370WUD (SB) (M3).
The matrix control uses the Timing Controller (T-CON) 6870C-0264B.
To power the backlight used inverter PPW-CC37SS-M.
The formation of the necessary supply voltages for all nodes of the LG 37SL8000 TV is carried out by the PSLL-T805A power supply module, or its analogs.
MainBoard - the main board (motherboard) is an EAX60890803 module, using LGF7329A-LF / LGE3369A-LF-SF, 25X32VSIG, HYB18TC1G160C2F, NTP-3100L, and others microcircuits.
The TDVW-H103F tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC370WUD-SBM3
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Brightness: 500 cd / m²
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering), CIE1931 72%
Response Time: 6 (G to G)
Frequency: 120Hz + 120Hz
