Technical description and composition of the PHILIPS 26PFL3404 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 26PFL3404 / 60
Chassis / Version: TPM2.1E LA
Panel: LC260WXE (SB) (B1)
Lamp backlight: 12 Lamp CCFL
T-CON: 6870C-0263A (SB) (B1)
Inverter (backlight): integrated into PSU
PWM Inverter: UBA2071AT
MOSFET Inverter: 2SK4087LS
Trans Inverter: 80GL26T938-DN
Power Supply (PSU): 715G3308-2
PWM Power: TNY277PN, NCP1271A
MOSFET Power: 8N80
MainBoard: 715G3285-2 WK915
IC MainBoard: MST9A885GL-LF; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR
Tuner: TAFT-5710D
Control: IR: 715G3374-1
Specifications 26PFL3404
PHILIPS 26PFL3404
General recommendations for repairing TV LCD
Possible manifestations of defects
- The PHILIPS 26PFL3404 TV does not turn on, does not respond to the remote control and control panel buttons, indicators do not light up and do not blink.
In such cases, the fault should be sought first in the 715G3308-2 power supply module. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches (8N80) and rectifier diodes for a probable short circuit.
In case of breakdowns in the secondary circuits, the converter can operate in a short circuit mode, and during a short circuit in the elements of the primary circuit, the mains fuse 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) TNY277PN, NCP1271A, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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.
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.
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, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the 715G3285-2 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 - MST9A885GL-LF; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR and failed chips replace 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.
The malfunction of the TAFT-5710D tuner is established after checking the software and all supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Owners and users of the PHILIPS 26PFL3404 TV should remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual and schematic diagram -----------------> PHILIPS 26PFL3404 Chassis TPM2.1E LA
The appearance of the MainBoard 715G3285-2 is shown in the figure below:715G3285-2
The appearance of the power supply
Main features of the PHILIPS 26PFL3404 device:
Installed matrix (LCD panel) LC260WXE (SB) (B1).
The matrix control uses the Timing Controller (T-CON) 6870C-0263A.
To power the backlight, a converter is used, combined with a power supply, controlled by a UBA2071AT PWM controller. The transformer 80GL26T938-DN is installed in the inverter converter. As power elements of the inverter, keys of the 2SK4087LS type are used.
The necessary supply voltages for all nodes of the PHILIPS 26PFL3404 television are generated by the 715G3308-2 power module or its analogs using TNY277PN, NCP1271A microcircuits and 8N80 type power switches.
MainBoard - the main board (motherboard) is a 715G3285-2 module, using MST9A885GL-LF chips; Spi Flash: MX25L1605D; Eeprom: 24C32, M24256BR and others.
The TAFT-5710D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC260WXE-SBB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 26.0 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 575.769x323.712 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Hi-FRC)
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: 12 pcs EEFL Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V