Technical description and composition of the PHILIPS 20PF4122 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 20PF4122 / 10
Chassis / Version: TPS1.0E LA
Panel: LC201V02
Inverter (backlight): 715T2572 -1
Power Supply (PSU): 715T2572 -1
MainBoard: 715T2229-2
IC MainBoard: CPU: MST96885LD-LF, DRAM: HY57V641620FTP-6, SPI Flash: 25L8005M2I
Tuner: FQ1216MEV
Appearance
PHILIPS 20PF4122
General recommendations for repairing TV LCD
Repair PHILIPS 20PF4122 / 10 is recommended to start with the diagnosis of the malfunction, which includes a careful inspection of the external and internal elements of the TV. It often happens that some damage to elements or connections helps determine the direction of the troubleshooting. Ring cracks in the soldering of the leads of the heating elements, swollen electrolytic capacitors, a charred paint layer on the resistors - all this for the repairman can be a hint in assumptions about the causes and consequences of the malfunction.
In the case when the 20PF4122 / 10 does not turn on, does not respond to the remote control and buttons on the front panel, does not blink bulbs and does not show any signs of operability, most likely in this case the 715T2527-1 power module is faulty. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch is detected, which can be integrated with the PWM controller, or a separate field-effect transistor can be used. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
In cases where the PHILIPS 20PF4122 / 10 TV has lost an image, and the sound is there and all the other functions are functional, 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.
Repair of the inverter can often be somewhat complicated by the use of special protection circuits, which are designed to disconnect it in emergency cases for fire safety when the lamps are depressurized, or short circuits or breaks in high-voltage circuits and connections. Sometimes it becomes necessary for diagnostic purposes to block the protection circuits in order to be able to make the necessary measurements at the control points of the circuit.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Diagnostics and repair of the motherboard 715T2229-2 is carried out by checking the operability of the stabilizers or power converters of the module chips. In some cases, a software update is required.
Owners and users of the PHILIPS 20PF4122 / 10 TV must remember that self-repair without special knowledge, skills and qualifications can be fraught with negative consequences that can lead to complete non-repairability of the device!
Service manual and schematic diagram 20PF4122/10 Chassis TPS1.0E LA
MODELS: 15PFL4122, 19PFL4322, 20PFL4122.
The appearance of the MainBoard 715T2229-2 is shown in the figure below:715T2229-2
715T2229-2 can be used in TVs:
PHILIPS 15PFL4122/10 (Panel T150XG01 V.4), PHILIPS 19PFL4322/10 (Panel M190A1), PHILIPS 20PF4122/10 (Panel LC201V02), PHILIPS 20PFL4122/10 (Panel LC201V02).
The appearance of the power supply
Main features of the PHILIPS 20PF4122 device:
Installed matrix (LCD panel) LC201V02.
To power the backlight used inverter 715T2572.
The formation of the necessary supply voltages for all nodes of the PHILIPS 20PF4122 TV is carried out by the 715T2572 power module, or its analogues.
MainBoard - the main board (motherboard) is a 715T2229-2 module using CPU chips: MST96885LD-LF, DRAM: HY57V641620FTP-6, SPI Flash: 25L8005M2I and others.
The FQ1216MEV tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC201V02-SDA3
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
