Technical description and composition of the PHILIPS 26PFL3405 TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 26PFL3405 / 12
Chassis / Version: TPN1.1E LA
Panel: LC260EXN SC B1 LED
LED driver (backlight): 715G3924-P1A-W20-002U
PWM LED driver: MAX16814 S393 on T-CON 70v
MOSFET LED driver: 10N20L FQT7N10 on T-CON 70v
Power Supply (PSU): 715G3924-P1A-W20-002U
PWM Power: TNY277PN (7), LD7576AGR (7)
MOSFET Power: STP10NK70ZFP
MainBoard: 715G3891-M1A-000-004B
Tuner: TEFT-S712D
PHILIPS LED
Model: 26PFL3405 / 60
Chassis / Version: TPN1.1E LA
Panel: LC260EXN (SC) (B1)
LED backlight: lnnotek 26 inch Horizontal Rev 0.9_84ea 2010.03.11 84LED
T-CON: 6870S-0955A
LED driver (backlight): ADTVA2430PA2 715G3924-P1A-W20-002U
Power Supply (PSU): 715G3924-P1A-W20-002U ADTVA2430PA2
PWM Power: TNY277PN (7), LD7576AGR (7)
MOSFET Power: 09N65
MainBoard: 715G3891-M1C-000-004X
IC MainBoard: SPI Flash: MX25l3205D
Tuner: PHI-CBPFAN5RP3
Control: IR: 715G3975-R1A-000-004U
Specifications 26PFL3405
PHILIPS 26PFL3405
General repair guidelines for TV LCD LED
Repair of the PHILIPS 26PFL3405 / 60 TV should begin with a fault diagnosis, which involves a careful examination of the external and internal elements of the device. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. 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.
In the absence of any signs of operability, when the PHILIPS 26PFL3405 does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the 715G3924-P1A-W20-002U ADTVA2430PA2 power supply module of the TV. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. When it is broken, the power elements of transistors 09N65 and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
It should be remembered that in the practice of repair, usually the power switches in switching power supplies (SMPS) do not fail due to their poor quality and, in such cases, it is necessary to look for the cause that led to a malfunction and provoked a breakdown of the key. Most often, the culprits of the accident are dried electrolytic capacitors or dangling resistors in the primary circuit, or the TNY277PN (7) LD7576AGR (7) PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If the PHILIPS 26PFL3405 has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the LC260EXN (SC) panel (B1), or their power converter - LED driver. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the LED driver itself, including in the secondary rectifier of the main PSU.
To check the health of the LEDs, as well as contact connections in the ruler circuit, the panel must be disassembled.
It is impossible to check the LED line for breaks without disassembling the panel with a multimeter or tester. For these purposes, it is necessary to open all series-connected PN junctions and a voltage of the order of tens of volts will be required, and ideally, a current source.
If the motherboard 715G3891-M1C-000-004X is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
In cases of complex repairs of MB (SSB) and in the presence of the necessary skills and equipment, sometimes it may be necessary to replace its flash chips MX25l3205D and other possible faulty components. Malfunctions associated with the application of BGA soldering technologies are usually easily diagnosed by the heating method.
If you suspect a malfunction of the PHI-CBPFAN5RP3 tuner, first of all, you need to make sure that there is a varicap supply voltage (30-33V) on the corresponding output of the tuner, as well as other voltage supplying it.
Owners and users of the PHILIPS 26PFL3405 TV must 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 26PFL3405/60 Chassis TPN1.1E LA
MODELS: 19PFL3405, 22PFL3405, 26PFL3405
The appearance of the MainBoard 715G3891-M1C-000-004X is shown in the figure below:715G3891-M1C-000-004X
715G3891-M1C-000-004X can be used in TVs:
PHILIPS 22PFL3405/60 (Panel LED), PHILIPS 26PFL3405/60 (Panel LC260EXN (SC)(B1)).
The appearance of the power supply
Main features of the PHILIPS 26PFL3405 device:
Installed matrix (LED-panel) LC260EXN (SC) (B1).
The matrix control uses the Timing Controller (T-CON) 6870S-0955A.
The LED driver ADTVA2430PA2 is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the PHILIPS 26PFL3405 TV are generated by the power supply module 715G3924-P1A-W20-002U, or its analogs using TNY277PN (7), LD7576AGR (7) microcircuits and 09N65 type power switches.
MainBoard - the main board (motherboard) is a 715G3891-M1C-000-004X module, using SPI Flash chips: MX25l3205D and others.
The PHI-CBPFAN5RP3 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC260EXN-SCB1
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: 400 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 8 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
