Technical description and composition of the PHILIPS 32PF7331 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 32PF7331 / 12
Chassis / Version: LC4.31E AA
Panel: LC320W01
T-CON: LC370WX1 / LC320W01 6870-005CF
Inverter (backlight): TE26B-M (A) REV03_6632L-0290D_LC260WX2, TE26B-3 (A) PEV03_6632L-0291D_LC260WX2
Power Supply (PSU): PLCD190P1 // DPS-188AP
PWM Power: TEA1533AT (SOP14), L6562D (PFC), TEA1601T (SOP16)
MainBoard: 3139-123-6117.2 WK542.2
IC MainBoard: TDA15021H / N1C91, TDA8931T
Tuner: UL1318S / AI H-3
Specifications 32PF7331
PHILIPS 32PF7331
General recommendations for repairing TV LCD
Any repair of electronic equipment usually begins with a careful external inspection of the device and troubleshooting. In this case, you should inspect all the elements of the PHILIPS 32PF7331 / 12 TV, both internal and external. Specific external damage to the elements can sometimes prompt further actions to determine the malfunction of the TV and localize the defect before the necessary measurements and waveforms are taken. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
Power Module Repair
In the absence of any signs of operability, when the PHILIPS 32PF7331 / 12 does not turn on and does not signal anything with the control lights on the panel, the B / PEC DV0-3_E177671 (S) power supply module is most likely 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 switch and rectifier bridge diodes should be checked for avalanche (thermal) breakdown.
As a rule, the keys of flyback converters, which use an N-Fet field effect transistor on a separate radiator, or integrated with a PWM controller in a single chip, are reliable enough and rarely fail for no reason. The reasons for the breakdown of the key should be sought by checking other components of the circuit - electrolytic capacitors, resistors and semiconductor elements of the primary circuit. The PWM chip is verified by replacing it with a known good one.
If an active Power Factor Corrector (PFC) is used in the power module circuitry, it is sometimes more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
Inverter Repair
Sometimes the PHILIPS 32PF7331 / 12 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
In most cases, the diagnosis and repair of the inverter TE26B-M (A) REV03_6632L-0290D_LC260WX2, TE26B-3 (A) PEV03_6632L-0291D_LC260WX2 is difficult due to the organization of protection, which disables it in emergency cases to avoid fires during short circuits or open circuits and open circuits during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the inverter control points to identify the causes of the defect.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
Repair Main Board
The motherboard must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up constantly. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary. Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements TDA15021H / N1C91, TDA8931T, UL1318S / AI H-3.
Owners of 32PF7331 / 12 TVs are recommended to contact qualified specialists with experience for repairs! Self-repair attempts without the appropriate knowledge and skills can lead to serious negative consequences!
Service manual and schematic diagram 32PF7331/12 Chassis LC4.31E AA
FOR MODELS 26PF5321/10/12, 32PF5321/10/12, 37PF5321/10/12, 26PF7321/12, 32PF7321/12, 37PF7321/10/12, 42PF5421/10.
PSU ---------------> PLCD190P1 schematic diagram
The appearance of MainBoard 3139-123-6117.2 is shown in the figure below:3139-123-6117.2
3139-123-6117.2 can be used in televisions:
PHILIPS 26PF4311S/10 (Panel LC260WX2(SL)(B2)), PHILIPS 26PF5521 (Panel PLCD170P2), PHILIPS 26PF7321/12 (Panel LC260WX2-SL04), PHILIPS 32PF4311S/10 (Panel LC320W01 (sl)(06)), PHILIPS 32PF4311S/10 (Panel LC320W01(SL)(06)), PHILIPS 32PF5331/12 (Panel T315XW01 V9), PHILIPS 32PF7321 (Panel LC320W01), PHILIPS 32PF7331/12 (Panel LC320W01), PHILIPS 32PFL3321S/60 (Panel LC320W01 (SL)(06)), PHILIPS 37PFL3321/10 (Panel LC370WX1-SL04), PHILIPS 32PF3321/12 (Panel CLAA320WB02 (P)), PHILIPS 37PF3321/12 (Panel LC370WX1 (SL)(04)).
PSU Advanced
The 32PF7331 / 12 model uses the PLCD190P1 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, this is a boost converter based on the L6562D PWM controller, which eliminates the charge current of the rectifier filter's electrolytic capacitor directly from the network through open diodes when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the PHILIPS 32PF7331 device:
Installed matrix (LCD-panel) LC320W01.
The matrix control uses the Timing Controller (T-CON) LC370WX1.
To power the backlight used inverter TE26B-M (A).
The necessary supply voltages for all nodes of the PHILIPS 32PF7331 TV are generated by the PLCD190P1 power module or its analogs using TEA1533AT (SOP14), L6562D (PFC), TEA1601T (SOP16) microcircuits.
MainBoard - the main board (motherboard) is a module 3139-123-6117.2, using chips TDA15021H / N1C91, TDA8931T and others.
The UL1318S / AI H-3 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC320W01-SL20
Type: a-Si TFT-LCD, Panel
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 697.68x392.26 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td); 8 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
