Technical description and composition of the PHILIPS 37PF3321 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PF3321 / 12
Chassis / Version: LC4.31E AA
Panel: LC370WX1 (SL) (04)
Lamp backlight: 20 LAMP EEFL
T-CON: LC370WX1
Inverter (backlight): Master: 6632L-0282A, Slave: 6632L-0283A
Power Supply (PSU): 3104-328-38021 2K
PWM Power: MC34067P
MainBoard: 3139-123-6117.2 WK542.2
IC MainBoard: gm1501-LF-M4747CF_0710S, M29W400DT, TDA15021H / N1C91, TDA8931T
Tuner: UL1318S / AI H-3_3139147 19801A
Specifications 37PF3321
PHILIPS 37PF3321
General recommendations for repairing TV LCD
Possible malfunctions
- The PHILIPS 37PF3321 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.
In some of these cases, the main switching power supply, module 3104-328-38021, is found to be faulty. It is necessary to measure its output supply voltages, and in case of their absence, check the serviceability of the power switches of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually 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 (OOS) stabilization circuits. PWM controllers (PWMs) of the MC34067P, if they have no 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, it reacts to the remote control. Or the image appears when you turn it on and immediately disappears
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. If all the electrolytic capacitors of the filter according to the inverter power supply are serviceable, you should make sure that the lamps are working, then you need to check the converter keys and the secondary windings of the transformers.
Sometimes, for diagnostic purposes, it is necessary to disable the inverter protection. In such cases, special care must be taken during work, and the protection circuits should be restored immediately after the repair is completed.
- The indicator blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard 3139-123-6117.2 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Verification or replacement of elements gm1501-LF-M4747CF_0710S, M29W400DT, TDA15021H / N1C91, TDA8931T requires the necessary training and professional skills in repairing modules at the component level. Problems associated with the use of BGA soldering technologies can sometimes be diagnosed by warming up.
If a tuner UL1318S / AI H-3_3139147 19801A is suspected, it is first necessary to verify the correctness of the software, as well as the presence of the necessary voltage levels and data exchange pulses with the processor via the I2C bus on the corresponding tuner pins.
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 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 37PF3321 device:
Installed matrix (LCD panel) LC370WX1 (SL) (04).
The matrix control uses the Timing Controller (T-CON) LC370WX1.
To power the backlight used inverter Master :.
The necessary supply voltages for all nodes of the PHILIPS 37PF3321 TV are generated by the power supply module 3104-328-38021, or its analogs using MC34067P microcircuits.
MainBoard - the main board (motherboard) is a module 3139-123-6117.2, using microchips gm1501-LF-M4747CF_0710S, M29W400DT, TDA15021H / N1C91, TDA8931T and others.
The tuner UL1318S / AI H-3_3139147 19801A provides the reception of television programs and tuning to channels.
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