Technical description and composition of the PHILIPS 42PFL8404H TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 42PFL8404H / 60
Chassis / Version: Q548.1E LA
Panel: LC420WUF-SBN1 code 183 p / n: 932226646682
Inverter (backlight): integrated into PSU
PWM Inverter: DAA003A (24pin), DDA002B
Power Supply (PSU): DPS-298CP -4A
PWM Power: 1606B (PFC), 3BS3LJ (PWM 8pin), DDA005 (6), DDA002B (PWM 20 pin)
MainBoard: 3139_123_64423V2 PNL 3139 123 64423v2 BD 3139 123 64433v2
IC MainBoard: PNX8539EH24182 LAN9420-NU
Tuner: HD1816AF / BHXP
Specifications 42PFL8404H
PHILIPS 42PFL8404H
General recommendations for repairing TV LCD
PHILIPS with the Q548.1E LA chassis, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Malfunctions of the DPS-298CP-4A power module can be expressed in different ways, for example, PHILIPS 42PFL8404H does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. It should be noted that with the same external manifestations, the processor power regulator (converter) may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
In most cases, key breakdowns in switching power supplies (SMPS) do not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
If the PHILIPS 42PFL8404H does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. 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 inverter itself, including in the secondary rectifier of the main PSU. It should be remembered that when protection is disabled in order to diagnose a malfunction, there is always a risk of failure of the power elements of the inverter. After repair, it is necessary to restore all standard converter protection circuits.
Remember! Attempts by users to independently repair the PHILIPS 42PFL8404H TV without the appropriate qualifications and the necessary experience can lead to serious negative consequences!
Service manual and schematic diagram 42PFL8404H/60 Chassis Q548.1E LA
PSU ----------------> DPS-298CP-2 DELTA schematic diagram
The appearance of MainBoard 3139_123_64423V2 is shown in the figure below:3139_123_64423V2
3139_123_64423V2 can be used in TVs:
PHILIPS 32PFL7864H/60 (Panel LC320WUF-SBN1), PHILIPS 32PFL8404H/60 (Panel LC320WUF (SB)(N1) code 181 p/n: 932226687682), PHILIPS 37PFL8404H/60 (Panel T370HW03 V.2 code 189), PHILIPS 42PFL7674H/60 (Panel LC420WUF(SB)(N1)), PHILIPS 42PFL7864 (Panel 42 ), PHILIPS 42PFL8404H/60 (Panel LC420WUF-SBN1 code 183 p/n: 932226646682).
PSU Advanced
The DPS-298CP power supply module is made using the Power Factor Correction (PFC) scheme to eliminate multiple AC harmonics introduced into the power supply by the device. The PFC assembly is a Step-Up Converter based on a 1606B PWM controller that evenly distributes high-frequency impulses of the charging current of the electrolytic capacitor of the rectifier filter of the mains voltage evenly over a period of 50 Hz. The current of its charge in this case will already be determined not by its reactance (usually 10-30 ohms for the network frequency), but by the elements of the converter. As a result, a change in the amplitude of the pulses (envelope) of the consumed current of the converter will repeat the shape and phase of the input sinusoidal voltage. The availability of an increased voltage (about + 380V) in the operating mode on the capacitor of the line filter indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the PHILIPS 42PFL8404H device:
Installed matrix (LCD panel) LC420WUF-SBN1 code 183 p / n: 932226646682.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller DAA003A (24pin), DDA002B.
The necessary supply voltages for all nodes of the PHILIPS 42PFL8404H TV are generated by the DPS-298CP power module, or its analogs using 1606B (PFC), 3BS3LJ (PWM 8pin), DDA005 (6), DDA002B (PWM 20 pin) microcircuits.
MainBoard - the main board (motherboard) is a 3139_123_64423V2 module, using PNX8539EH24182 LAN9420-NU chips and others.
The HD1816AF / BHXP tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420WUF-SBN1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering)
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: 18 pcs EEFL Without Driver
Signal Interface: LVDS (4 ch, 8/10-bit), 92 pins
Voltage: 12.0V
