Technical description and composition of the PHILIPS 37PFL3403D TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PFL3403D / 12
Chassis / Version: Q522.2E LA
Panel: LC370WXN-SAA1
Inverter (backlight): integrated into PSU
PWM Inverter: P2S26AGN
Power Supply (PSU): LIPS250PS04 3122 423 32646
PWM Power: L6562A, NCP1205DG
MOSFET Power: P5NK50ZFP, P8NM60N, FQPF3N80C
MainBoard: 313912364461V1 W827.5 BD 313912364471v1
IC MainBoard: PNX8541E1 / 2416, NAND512W3A2CN6, 25P05VP, 24C64
Tuner: TD1716F / BHXP-3
Specifications 37PFL3403D
PHILIPS 37PFL3403D
General recommendations for repairing TV LCD
Possible malfunctions
- PHILIPS 37PFL3403D does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
With similar manifestations, in some cases, the LIPS250PS04 power module 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 (P5NK50ZFP, P8NM60N, FQPF3N80C) and rectifier diodes of the converters for possible 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.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, in the power supply circuit of a PWM controller, in frequency-setting or damping circuits, as well as in Negative Stabilization Feedback. PWM circuits L6562A, NCP1205DG are usually checked by replacing with new, or obviously working.
- There is no image, but there is sound and reaction to commands from the remote control. Or the image appears immediately after turning on and 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 inverter. If all the electrolytic capacitors of the filter according to the power supply of the inverter are working, make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
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 circuit 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 313912364461V1 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit 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 - PNX8541E1 / 2416, NAND512W3A2CN6, 25P05VP, 24C64 and replace 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 the TV works normally from external devices, but does not tune into television channels, the TD1716F / BHXP-3 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.
It should be remembered! Attempts to independently repair the PHILIPS 37PFL3403D 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-serviceability of the device!
The appearance of MainBoard 313912364461V1 is shown in the figure below:313912364461V1
Key Features of PHILIPS 37PFL3403D:
Installed matrix (LCD panel) LC370WXN-SAA1.
To power the backlight, a converter is used, combined with a power supply, controlled by a P2S26AGN PWM controller.
The necessary supply voltages for all nodes of the PHILIPS 37PFL3403D TV are generated by the LIPS250PS04 power supply module or its analogs using L6562A, NCP1205DG microcircuits and power switches of the type P5NK50ZFP, P8NM60N, FQPF3N80C.
MainBoard - the main board (motherboard) is a module 313912364461V1, using chips PNX8541E1 / 2416, NAND512W3A2CN6, 25P05VP, 24C64 and others.
The tuner TD1716F / BHXP-3 provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC370WXN-SAA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1100: 1
Display Colors: 16.7M (8-bit)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 16 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
