Technical description and composition of the PHILIPS 19PFL3405 TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 19PFL3405 / 60
Chassis / Version: TPN1.1E LA
Panel: LC185EXN-SCA1 code 119 p / n: 932227707682
LED driver (backlight): 715G3897-P1A-W20-002U
Power Supply (PSU): 715G3879-P1A-W20-002U
PWM Power: LD7576 (8)
MOSFET Power: K4101, AO4443 (8)
MainBoard: 715G3891-M1A-000-004B PH1CBPFAN5RP1 CBPFAN5RZ1S01
IC MainBoard: AD825818 NT5TU32M16C6-26
Control: 2422 549 02454 705TZ8SK122
Specifications 19PFL3405
PHILIPS 19PFL3405
General repair guidelines for TV LCD LED
TV PHILIPS 19PFL3405 / 60, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Sometimes, based on visible changes in the components of the device, it is possible to draw some conclusions and determine the direction of further troubleshooting even before the necessary measurements are taken. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Faults in the 715G3879-P1A-W20-002U power module can be expressed in different ways, for example, PHILIPS 19PFL3405 does not turn on at all and the control lamps on its front panel do not light up and do not blink, and there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. When diagnosing and repairing the power supply, after replacing the swollen capacitors of the filters of the secondary rectifiers (if any), you must first check the mains fuse. When it is broken, the power elements of the transistors K4101, AO4443 (8) 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 LD7576 PWM controller chip itself may be faulty (8). It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
If PHILIPS 19PFL3405 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 LC185EXN-SCA1 KR LED (119) 9322 277 07682 panel, or their power converter is an 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, it is necessary to disassemble the panel.
When diagnosing, it is necessary to take into account that it is impossible to check the open in the chain of LED lines without disassembling the panels using a tester or multimeter. To open all PN junctions connected in series, a voltage of the order of several tens of volts is required, and ideally, a current source.
Repair or diagnostics of the motherboard 715G3891-M1A-000-004B PH1CBPFAN5RP1 CBPFAN5RZ1S01 should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software).
Board repair and replacement of AD825818 NT5TU32M16C6-26 microcircuits are carried out in the presence of the necessary equipment, and the corresponding element base. Faults associated with the application of BGA processor soldering technologies can be localized by the heating method.
Owners and users of the PHILIPS 19PFL3405 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 19PFL3405/60 Chassis TPN1.1E LA
FOR MODELS: 19PFL3405, 22PFL3405, 26PFL3405.
Matrix LC185EXN (SC)(A1) LG Panel specification LC185EXN (SC)(A1)
The appearance of MainBoard 715G3891-M1A-000-004B is shown in the figure below:715G3891-M1A-000-004B
715G3891-M1A-000-004B can be used in TVs:
PHILIPS 19PFL3405/60 (Panel LC185EXN-SCA1 code 119 p/n: 932227707682), PHILIPS 22PFL3405/12 (Panel 22 inch), PHILIPS 26PFL3405/12 (Panel LC260EXN SC B1 LED).
The appearance of the power supply
Main features of the PHILIPS 19PFL3405 device:
Installed matrix (LED panel) LC185EXN-SCA1 code 119 p / n: 932227707682.
The LED driver 715G3897-P1A-W20-002U is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the PHILIPS 19PFL3405 television are generated by the power supply module 715G3879-P1A-W20-002U, or its analogs using microcircuits LD7576 (8) and power switches of the type K4101, AO4443 (8).
MainBoard - the main board (motherboard) is a 715G3891-M1A-000-004B module, using AD825818 NT5TU32M16C6-26 microcircuits and others.
Additional technical information about the panel:
Brand: LG Display
Model: LC185EXN-SCA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 18.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 409.8x230.4 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 300 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (6-bit + Dithering), CIE1931 68%
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: WLED Embedded (LED Driver)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 5.0V
