Technical description and composition of the PHILIPS 37PF5321 TV, type of panel and applicable modules. The composition of the modules.PHILIPS 6632L-0283A
Model: 37PF5321 / 12
Chassis / Version: LC4.31E AA
Panel: LC370WX1 (SL) (04)
T-CON: LC370WX1 / LC320W01 6870C-0060F
Inverter (backlight): 6632L-0283A ITV-EE37-S
Power Supply (PSU): 310432838021 310431360822
PWM Power: MC34067P
MOSFET Power: P15NK50ZFP
MainBoard: WK549.3 3139 123 6161.3
IC MainBoard: gm1501-LF, P3563M-LF-80
Tuner: UV1318SD / ACPHN-4
Specifications 37PF5321
PHILIPS 37PF5321
General repair instructions for TV LCD 6632L-0283A
Possible manifestations of defects
- The PHILIPS 37PF5321 TV does not turn on and does not show any signs of operability at all. There is no reaction to the remote control and control buttons from the front panel.
Most likely, in this case, the main switching power supply (MPS) 310432838021 is faulty. It is necessary to measure its secondary output voltages, and if they are absent, check the power switches (P15NK50ZFP) and rectifier diodes in the converters for a short circuit.
In the event of a breakdown in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWMs) of the MC34067P, if they do not have visible damage to the chassis and open short-circuit between the terminals, are usually checked by replacement.
- There is no image, but there is sound and reaction to the remote control. Or for a second, the image may appear immediately after switching on.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after their completion it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
- The TV does not turn on, does not respond to the remote control. The indicator blinks or signals standby mode.
Repair or diagnostics of the WK549.3 motherboard should begin by checking the stabilizers and power converters needed to power the chips and matrix. If necessary, update or replace the software (software). Often, the MB (SSB) card must be replaced in case of complex malfunctions that are difficult to detect. When trying to repair, you should check its elements - gm1501-LF, P3563M-LF-80 and replace failed chips with new ones. Some malfunctions may be due to the use of BGA soldering technologies in modern Main Board technologies. Typically, such defects are detected by local heating of the chip.
The malfunction of the UV1318SD / ACPHN-4 tuner is established after checking the software and all the supply voltages at its terminals. The data exchange of the tuner with the processor via the I2C bus can be controlled by an oscilloscope.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Entrust repair to professionals with sufficient experience in the field of repair of electronic equipment.
Service manual and schematic diagram 37PFL3321/10 Chassis LC4.31E AA
FOR MODELS: 26PF5321/10/12, 32PF5321/10/12, 37PF5321/10/12, 26PF7321/12, 32PF7321/12, 37PF7321/10/12, 42PF5421/10
The appearance of the MainBoard WK549.3 is shown in the figure below:WK549.3
Main features of the PHILIPS 37PF5321 device:
The matrix (6632L-0283A-panel) LC370WX1 (SL) (04) is installed.
The matrix control uses the Timing Controller (T-CON) LC370WX1.
An inverter 6632L-0283A is used to power the backlight LEDs.
The necessary supply voltages for all nodes of the PHILIPS 37PF5321 TV are generated by the power supply module 310432838021, or its analogs using MC34067P microcircuits and power switches of the P15NK50ZFP type.
MainBoard - the main board (motherboard) is a WK549.3 module, using microchips gm1501-LF, P3563M-LF-80 and others.
The UV1318SD / ACPHN-4 tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC370WX1-SL04
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1366x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.6x460.8 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 9 (G to G)
Frequency: 60Hz
Lamp Type: 20 pcs EEFL Embedded (Inverter)
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V