Technical description and composition of the PHILIPS 20PF4121 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 20PF4121 / 58
Chassis / Version: LC4.1E AB
Panel: LC201V02 (SD) (B1)
Inverter (backlight): DAC-12M019 AOF 3139 128 77613 REV: 05 type1 3139 128 77611/77612/77613
PWM Inverter: BIT3193G (16)
MOSFET Inverter: 40P03G1, 40T03GP
Trans Inverter: 2804703500
Power Supply (PSU): DAC-12M019 AOF 3139 128 77613 REV: 05 type2 3122 137 23101 BL6L70P3B
PWM Power: TEA1532A (8)
MOSFET Power: 11N80C3
MainBoard: 3139_123_60192 S4CEV1 3139 123 60192 Wk534.3
IC MainBoard: gm5221-FL, LD1086-18, SM5301BS, 78M08, TDA15021H1 / N1C91, SM5301BS 74LVC08AD 34063 157501GL HC4053M LC14A
Tuner: UV1318S / A H-3 3139 147 19801A
Control: RC1683803 / 01H 3139 238 11771
Specifications 20PF4121
PHILIPS 20PF4121
General recommendations for repairing TV LCD
TV PHILIPS 20PF4121 / 58, like other electronic devices, it is advisable to start repairing from inspection of external and internal elements. Many visible changes make it possible to determine the future direction of troubleshooting and localization of the defect. Carbonized paint on the upper layer of resistors, electrolytic capacitors of rectifier filters swollen after boiling, cracked soldering at the terminals of heating elements or transformers can often suggest the cause of the defect and possible consequences.
Malfunctions of the power supply module DAC-12M019 AOF 3139 128 77613 REV: 05 type2 3122 137 23101 BL6L70P3B can be expressed differently, for example, PHILIPS 20PF4121 / 58 does not turn on at all and the control lamps on its front panel do not light up and do not blink, there are no signs of operability. Diagnostics and repair of the common power supply should always begin with a check of the mains fuse and the condition of the electrolytic capacitors of the secondary rectifier filters. Defective and swollen capacitors should be replaced with new ones. If the fuse breaks, it is advisable to check for a breakdown, first of all, all power semiconductor elements of the converter and the rectifier diode bridge of the network, as well as the large electrolytic capacitor of the filter of the network rectifier and the key transistor 11N80C3.
It should be remembered that the N-FET keys used in flyback converters rarely fail without their own sake without any reasons that must be sought by checking other elements of the circuit. Often the breakdown is caused by malfunctions of electrolytic capacitors or semiconductor elements in the primary circuit, or by a break in the resistors in the stabilization circuits. The EA1532A PWM controller chip (8) can also cause a breakdown of the power switch of the converter.
If an active Power Factor Corrector (CMC) is used in the power module circuitry, it can sometimes become more difficult to troubleshoot. Knowledge, experience, intuition and skills in such cases have a great advantage for a successful repair.
In cases where the PHILIPS 20PF4121 / 58 TV has lost an image, and the sound is there and all the other functions are operational, there is a possibility of a malfunction of the inverter (converter for powering the backlight). When you turn on the TV, the image may appear briefly and immediately disappear. It must be borne in mind that with such manifestations, the lamps themselves also fail, the malfunction of which can be detected by replacement, by connecting to the connectors for diagnostics that are known to be serviceable and suitable in power.
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.
In such cases, the risk of failure of the power elements of the inverter is most likely, and special care is required during work, and after their completion, it is necessary to restore the protection circuit for further safe operation of the TV by the owner in normal mode.
Repair or diagnostics of the motherboard 3139 123 60192 S4CEV1 should begin by checking the stabilizers or power converters of its microcircuits. If necessary, you should update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - gm5221-FL, LD1086-18, SM5301BS, 78M08, TDA15021H1 / N1C91, SM5301BS 74LVC08AD 34063 157501GL HC4053M LC14A, tuner UV1318S / A.
Once again, remind users! Attempts at self-repair of the PHILIPS 20PF4121 / 58 TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram 20PF4121/58 Chassis LC4.1E AB
MODELS:: 15PF4110, 15PF5120, 17PF4310, 20PF4110, 20PF4310, 20PF5120, 20PF5320, 23PF5320
The appearance of MainBoard 3139_123_60192 is shown in the figure below:3139_123_60192
3139_123_60192 can be used in TVs:
PHILIPS 20PF4110S/58 (Panel LC201V02 (SD)(B1)), PHILIPS 15PF4121/58 (Panel LC150X02 (TL)(01)), PHILIPS 15PF5120/58 (Panel LC150X02), PHILIPS 15PF5121/58 (Panel IDM69E1S51718 Rev:01 QD15XL16 ), PHILIPS 15PF5121/58 (Panel T150XG01 V.3), PHILIPS 20HF5474/10 (Panel LC201V02 (SD)(D1)), PHILIPS 20PF4121/58 (Panel LC201V02 (SD)(B1)), PHILIPS 20PF5120/58 (Panel A201SN02 V4), PHILIPS 20PF5320/58 (Panel LC200WX1 (SL)(01)), PHILIPS 20PFL4101S/60 (Panel LC201V02 SD B1), PHILIPS 20PFL4102S/60 (Panel LC201V02 (SD)(D1)), PHILIPS 20PFL4102S/60 (Panel LC201V02 (CD)(B1)), PHILIPS 20PFL4112S/60 (Panel LC201V02 (SD)(B1)), PHILIPS 20PFL4112S/60 (Panel LC201V02 SD D1), PHILIPS 20PFL4122/58 (Panel A201SN02 V.5), PHILIPS 20PFL5122/58 (Panel A201SN02 V.5), PHILIPS 23PFL5322/58 (Panel T230XW01 V.3), PHILIPS 23PF4321/58 (Panel T230XW01 V.2).
The appearance of the power supply
Main features of the PHILIPS 20PF4121 device:
Installed matrix (LCD panel) LC201V02 (SD) (B1).
To power the backlight, an inverter DAC-12M019 is used, it is controlled by the BIT3193G PWM controller (16). A transformer 2804703500 is installed in the inverter converter. Keys of the type 40P03G1, 40T03GP are used as power elements of the inverter.
The necessary supply voltages for all nodes of the PHILIPS 20PF4121 television are generated by the DAC-12M019 power supply module or its analogs using TEA1532A microcircuits (8) and power switches of the 11N80C3 type.
MainBoard - the main board (motherboard) is a module 3139_123_60192, using microchips gm5221-FL, LD1086-18, SM5301BS, 78M08, TDA15021H1 / N1C91, SM5301BS 74LVC08AD 34063 157501GL HC4053M LC14A and others.
The tuner UV1318S / A H-3 3139 147 19801A provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDB1
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 640x480, VGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 408x306 mm
Surface: Antiglare, Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 800: 1
Display Colors: 16.7M (8-bit)
Response Time: 12/13 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: CMOS (1 ch, 8-bit), 41 pins
Voltage: 12.0V
