Technical description and composition of the PHILIPS 37PFL3321 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PFL3321 / 10
Chassis / Version: LC4.31E AA
Panel: LC370WX1-SL04 // T370XW01 V.1.
Inverter (backlight): LC370WX1 slave, master
Power Supply (PSU): 3104-328-38021 3104 328 38021, AUDIO STANDBY 2K6 3139 268 02421
PWM Power: MC34067P (16)
MainBoard: 3139-123-6117.2 WK542.2
IC MainBoard: gm1501-LF-M4747CF_0710S, TDA15021H / N1C91, M29W400DT
Tuner: UL1318S / AI H-3
Control: IR: 3104 313 60743
Appearance
PHILIPS 37PFL3321
General recommendations for repairing TV LCD
It is recommended that you start the diagnostics of a malfunction of the PHILIPS 37PFL3321 / 10 TV, as well as all other electronic devices, with an external inspection of both external and internal elements and modules. Many visible changes make it possible to determine the future direction of troubleshooting and localization of the defect. Experienced repairmen are often aware of the causes of the defect and possible consequences, for example, from ring cracks in the soldering of the leads of the elements, as well as from swollen capacitors or resistors burnt to coal dust and other external indirect signs.
Power Module Repair
If the 37PFL3321 / 10 TV does not turn on, does not emit any sounds when it is turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some PHILIPS models. When diagnosing and repairing the power supply, first of all, replace the swollen capacitors of the filter of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module - rectifier diodes or power key.
The reasons for the breakdown of the power switch of the flyback converter of the power supply module can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the MC34067P PWM controller microcircuit or broken resistors in its bundle.
It is somewhat more difficult to find faults in the converter of the power module with an active KKM (power factor corrector).
Inverter Repair
If there is no image when you turn on the PHILIPS 37PFL3321 / 10, or it appears for a second and disappears completely, but there is sound, most likely either the backlight 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.
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.
Turning off the protection for diagnostic purposes, it must be remembered that in this case there is a risk of failure of the power elements of the inverter. Upon completion of the diagnosis, all regular protection circuits should be restored.
Once again, we remind TV users: you should not make attempts to repair it yourself without the appropriate knowledge, experience and the necessary qualifications! Trust the repair only to professionals with sufficient experience in the field of electronic equipment repair.
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 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)).
The appearance of the power supply
Main features of the PHILIPS 37PFL3321 device:
Installed matrix (LCD panel) LC370WX1-SL04 or T370XW01 V.1 ..
To power the backlight used inverter LC370WX1.
The necessary supply voltages for all nodes of the PHILIPS 37PFL3321 TV are generated by the power supply module 3104-328-38021, or its analogs using MC34067P microcircuits (16).
MainBoard - the main board (motherboard) is a module 3139-123-6117.2, using microchips gm1501-LF-M4747CF_0710S, TDA15021H / N1C91, M29W400DT 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: 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
