Technical description and composition of the PHILIPS 42PFL7406H TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 42PFL7406H / 60
Chassis / Version: Q552.2E LA
Panel: LC420EUF (SD) (A1)
LED backlight: 3660L-0374A 201
T-CON: 6870C-0358A
LED driver (backlight): integrated into PSU
PWM LED driver: DDA009
Power Supply (PSU): DPS-139AP
PWM Power: NCP1608B (PFC), S101, DDA010, 2QS02G
MainBoard: 313912365182 313912365192 WK1101.3
IC MainBoard: PNX85537, 29F4C08ABADA, TPA3120D2
Tuner: TH2627
Specifications 42PFL7406H
PHILIPS 42PFL7406H
General repair guidelines for TV LCD LED
Possible malfunctions
- The PHILIPS 42PFL7406H TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
With such manifestations, the DPS-139AP power supply module usually fails. It is necessary to verify the presence of its output voltages and, if they are completely absent, check the power switches and rectifier diodes for a probable short circuit.
In case of any breakdowns in the secondary circuits, the converter can operate in emergency short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse or the current sensor at the source of the key more often breaks.
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 NCP1608B (PFC), S101, DDA010, 2QS02G are usually checked by replacing with new ones, or obviously working.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
In most of these cases, a malfunction is detected in the nodes and backlight elements of the LED panel. The reason can be both in the power supply of the LEDs, in their serviceability (breakdown or breakage), as well as in the violation of the contact connections of the LED strips.
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. By opening the panel, each LED can be checked separately. Typically, Chinese multimeters light up a single 3-volt LED, if you connect probes in the forward direction to it. In dual 6-volt LEDs, the PN junction of its emergency zener diode can serve as an indicator of health. In the event of a LED malfunction, its zener diode will either be cut off or broken into short-circuit.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the motherboard 313912365182 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). If it is not possible to replace the MB board (SSB), you need to check the health of its elements - PNX85537, 29F4C08ABADA, TPA3120D2. Defective components should be replaced.
In cases where there is no tuning to the channels of on-air or cable television, you should make sure that the software is correct, as well as in accordance with the ratings of the supply voltage at the terminals of the tuner TH2603. It is also necessary to check the presence of pulses of data exchange between the tuner and the processor via the I2C bus using an oscilloscope.
Attention! For users and owners of 42PFL7406H TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-serviceability of the device.
Service manual and schematic diagram 42PFL7406H/60 Chassis Q552.2E LA
FOR MODELS: 32PFL6606H/12, 32PFL6606H/60, 32PFL6606K/02, 32PFL6606M/08, 32PFL6626H/12, 32PFL6626K/02, 32PFL6626M/08, 32PFL6636H/12, 32PFL6636K/02, 32PFL6636M/08, 32PFL7406H/12, 32PFL7406K/02, 32PFL7406M/08, 32PFL7476H/12, 32PFL7476K/02, 32PFL7486H/12, 32PFL7486K/02, 32PFL7486M/08, 32PFL7496H/12, 32PFL7496K/02, 37PFL6606H/12, 37PFL6606H/60, 37PFL6606K/02, 37PFL6606M/08, 40PFL6606H/12, 40PFL6606H/60, 40PFL6606K/02, 40PFL6606M/08, 40PFL6626H/12, 40PFL6626K/02, 40PFL6626M/08, 40PFL6636H/12, 40PFL6636K/02, 40PFL6636M/08, 42PFL7406H/12, 42PFL7406K/02, 42PFL7406M/08, 42PFL7456H/12, 42PFL7456K/02, 42PFL7456M/08, 42PFL7486H/12, 42PFL7486K/02, 42PFL7486M/08, 42PFL7606H/12, 42PFL7606K/02, 42PFL7606M/08, 42PFL7666H/12, 42PFL7666K/02, 42PFL7676H/12, 42PFL7676K/02, 42PFL7696H/12, 42PFL7696M/08, 46PFL6606H/12, 46PFL6606H/60, 46PFL6606K/02, 46PFL6606M/08, 46PFL6626H/12, 46PFL6626K/02, 47PFL7606H/12, 47PFL7606K/02, 47PFL7606M/08, 47PFL7666H/12, 47PFL7666K/02, 47PFL7696H/1, 47PFL7696K/02, 47PFL7696M/08, 55PFL6606H/12, 55PFL6606H/60, 55PFL6606K/02, 55PFL6606M/08
The appearance of MainBoard 313912365182 is shown in the figure below:313912365182
313912365182 can be used in TVs:
PHILIPS 47PFL7606H/60 (Panel LC470EUF (SD)(F2)), PHILIPS 32PFL7606H/12 (Panel LC320EUF (SD)(F2)).
The appearance of the power supply
Main features of the PHILIPS 42PFL7406H device:
Installed matrix (LED-panel) LC420EUF (SD) (A1).
The matrix control uses the Timing Controller (T-CON) 6870C-0358A.
To power the backlight LEDs, a converter is used, combined with the power supply, controlled by the DDA009 PWM controller.
The necessary supply voltages for all nodes of the PHILIPS 42PFL7406H TV are generated by the DPS-139AP power module or its analogs using NCP1608B (PFC), S101, DDA010, 2QS02G microcircuits.
MainBoard - the main board (motherboard) is a module 313912365182, using chips PNX85537, 29F4C08ABADA, TPA3120D2 and others.
The TH2627 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG Display
Model: LC420EUF-SDA1
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: 450 cd / m²
Contrast Ratio: 1600: 1
Display Colors: 1.06B (8-bit + FRC), CIE1931 72%
Response Time: 5 (G to G); 8 (MPRT)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V