Technical description and composition of the PHILIPS 37PFL8404H TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PFL8404H / 60
Chassis / Version: Q548.1E LA
Panel: T370HW03 V.2 code 189
T-CON: T370HW02 VF CTRL BD (AS15-F)
Inverter (backlight): integrated into PSU
PWM Inverter: DDA003A (24pin), DDA002B
MOSFET Inverter: P6NK60ZFP, 6679GH
Trans Inverter: MP-130B
Power Supply (PSU): DPS-298CP DELTA
PWM Power: 1606B (PFC), 3BS3LJ (PWM 8pin), DDA005 (6), DDA002B (PWM 20pin)
MOSFET Power: K4101, P6NK60ZFP
MainBoard: 3139_123_64423V2 PNL 3139 123 64423v2 BD 3139 123 64433v2 - WK928.3
IC MainBoard: PNX8539EH24182 LAN9420-NU TDA9996HL / C4
Tuner: HD1816AF / BHXP
Control: IR: 2722 171 00726 (GWA7.820.628-4B (HT)
Specifications 37PFL8404H
PHILIPS 37PFL8404H
General recommendations for repairing TV LCD
Repair of the PHILIPS 37PFL8404H / 60 TV is advisable to start with a careful external examination. In this case, both external and internal components of the device should be inspected. Visible damage to elements can sometimes suggest directions for troubleshooting even before the necessary measurements are taken. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
Power Module Repair
In cases when the PHILIPS 37PFL8404H / 60 TV does not turn on, does not respond to the remote control and buttons, any indicators on the front panel do not light up or blink, and there are no sounds and no signs of operability at all, the DPS-298CP power supply module is most likely to be faulty DELTA or, which is somewhat rarer, there is no processor power on the motherboard (a typical defect of some PHILIPS TVs). In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Options are K4101 P6NK60ZFP, 6679GH (3).
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The cause may be a malfunction of the PWM controller chip 1606B (8) 3BS3LJ (8) DAA003A (24), which can only be checked by replacing it with a new or obviously working one.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
Inverter Repair
If there is no image when you turn on the PHILIPS 37PFL8404H / 60, or it appears for a second and disappears completely, but there is sound, most likely either the backlight lamps or their power converter (inverter) are faulty. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
Diagnostics and repair of the inverter are often complicated by the organization of special protection circuits, which is necessary for fire safety and turns off the inverter in any emergency situation, for example, when the lamps are worn or depressurized. Often, to block a defect, it needs to be locked.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
Repair Main Board
The PL5A motherboard should be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary. In some cases, to repair the MB board (SSB), it may be necessary to replace the elements - PNX8539EH24182, LAN9420-NU, TDA9996HL / C4, tuner HD1816AF with new or obviously working ones.
It should be remembered! Attempts to repair the PHILIPS 37PFL8404H / 60 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete failure of the device!
One of the typical defects of the PHILIPS 37PFL8404H / 60 TV can occur in the T370HW03 V.2 panel code 189.
External manifestations: color distortion in the image as a negative in the image, light tones predominate. Usually in such cases, the AS15-F gamma corrector is faulty. Another indicator of its malfunction is an excessively strong heating, which in practice allows you to do without measuring voltage gradations of gray.
In most cases, replacing the AS15-F solves the problem.
It should be remembered that similar symptoms can cause faults in the column drivers of the panel, which is usually indicated interference in the form of even vertical stripes on the screen. Then, after replacing the AS15-F, the situation does not change. Drivers are in loops and cannot be replaced. In this case, it is necessary to replace the glass panel !!
Service manual and schematic diagram 37PFL8404H/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 37PFL8404H / 60 TV is equipped with a DPS-298CP power module using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate the higher harmonic components of the current consumption. The step-up converter based on the 1606B PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes, when the reactance (about 15-30 ohms at a frequency of 50 Hz) determines the charge current. As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the PHILIPS 37PFL8404H device:
Installed matrix (LCD panel) T370HW03 V.2 code 189.
The matrix control uses the Timing Controller (T-CON) T370HW02.
To power the backlight, a converter is used, combined with a power supply, controlled by a PWM controller DDA003A (24pin), DDA002B. The transformer MP-130B is installed in the inverter converter. As power elements of the inverter, keys of the type P6NK60ZFP, 6679GH are used.
The necessary supply voltages for all nodes of the PHILIPS 37PFL8404H TV are generated by the DPS-298CP power supply module or its analogs using microcircuits 1606B (PFC), 3BS3LJ (PWM 8pin), DDA005 (6), DDA002B (PWM 20pin) and power switches of the K4101 type. P6NK60ZFP.
MainBoard - the main board (motherboard) is a 3139_123_64423V2 module, using PNX8539EH24182 LAN9420-NU TDA9996HL / C4 chips and others.
The HD1816AF / BHXP tuner provides television reception and channel tuning.
Additional technical information about the panel:
Brand: AUO
Model: T370HW03 V2
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: AMVA3, Normally Black, Transmissive
Active Area: 819.36x460.89 mm
Surface: Antiglare (Haze 11%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 5000: 1
Display Colors: 1.07B (8-bit + Hi-FRC), CIE1931 72%
Response Time: 8 (G to G)
Frequency: 120Hz
Lamp Type: 16 pcs CCFL Embedded (Balance board)
Signal Interface: LVDS (4 ch, 10-bit), 92 pins
Voltage: 12.0V