Technical description and composition of the PHILIPS 37PF9731D TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PF9731D / 10
Chassis / Version: FJ3.0E LA
Panel: LK370D3LZ33 code 031
T-CON: CPWBX3386TPZ
Inverter (backlight): 67-03583 U, 67-03425 U
Power Supply (PSU): 3104_313_61215 310432847022 37PLATF25W PSUDISP24FHDEU
PWM Power: MC34067P
MainBoard: 310432844061 - 3104 328 44061
Specifications 37PF9731D
PHILIPS 37PF9731D
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the PHILIPS 37PF9731D / 10 TV, as well as other devices, with a careful external examination of internal and external elements, including case parts, a display, buttons, and cables. Often, by visible changes, it is possible to determine the further direction of troubleshooting and localization of the defect before the start of the acquisition of oscillograms and the necessary measurements. 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.
Power Module Repair
If PHILIPS 37PF9731D / 10 does not turn on, no control lights on the front panel light up and do not blink, therefore, there is a very high probability of a power supply module 310432847022 37PLATF25W PSUDISP24FHDEU malfunction. 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.
It should be remembered that in the practice of repair, usually the power keys of N-Fet converters 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 MC34067P PWM controller chip itself may be faulty. It is also necessary to check all the semiconductor elements of the stabilization circuit in the primary and secondary circuits.
When using an active Power Factor Correction (CMC) circuit in the power module, the search for faulty elements is somewhat more complicated.
Inverter Repair
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
The operation of the power circuits of the inverter and the backlight in the normal mode are controlled by special protection, which is organized for fire safety, for example, to disconnect during short circuits or breaks in high-voltage connections or when the lamps are depressurized. This protection makes it difficult to diagnose and repair the inverter.
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
If the motherboard S 3104 328 44061 is faulty, first of all it is necessary to check all the linear stabilizers or power converters of its chips, and also, if necessary, update the software. Sometimes you can check the health of MB only by replacement.
It should be remembered! Attempts to repair the PHILIPS 37PF9731D / 10 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-serviceability of the device!
Service manual and schematic diagram 37PF9731D/10 Chassis FJ3.0E LA
FOR MODELS: 32PF9531/10, 32PF9631D/10, 32PF9731D/10, 37PF9731/69, 37PF9731D/10, 42PF9641D/10, 42PF9731D/10, 42PF9831/69, 42PF9831D/10
The appearance of MainBoard 310432844061 is shown in the figure below:310432844061
The appearance of the power supply
Main features of the PHILIPS 37PF9731D device:
Installed matrix (LCD panel) LK370D3LZ33 code 031.
The matrix control uses the Timing Controller (T-CON) CPWBX3386TPZ.
To power the backlight used inverter 67-03583.
The necessary supply voltages for all nodes of the PHILIPS 37PF9731D TV are generated by the power supply module 3104_313_61215, or its analogs using MC34067P microcircuits.
MainBoard - the main board (motherboard) is a module 310432844061.
Additional technical information about the panel:
Brand: SHARP
Model: LK370D3LZ33
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: ASV, Normally Black, Transmissive
Active Area: 819.4x460.9 mm
Surface: Antiglare (Haze 23%), Hard coating (2H), Antireflection
Brightness: 550 cd / m²
Contrast Ratio: 1000: 1
Display Colors: 16.7M (8-bit)
Response Time: 4/6 (Tr / Td)
Frequency: 60Hz
Lamp Type: 24 pcs CCFL Embedded (Inverter)
Signal Interface: LVDS (2 ch, 8-bit), 71 pins
Voltage: 12.0V