Technical description and composition of the PHILIPS 20PF5120 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 20PF5120 / 58
Chassis / Version: LC4.1E AB
Panel: A201SN02 V4
Inverter (backlight): integrated into PSU
PWM Inverter: UBA2070T (16)
MOSFET Inverter: 5NM60
Power Supply (PSU): BL6L70P3 23101 BL6L70P6
PWM Power: TEA1533AP, L6562D (PFC)
MOSFET Power: 6K13S, P10NK60ZFP
MainBoard: 3139_123_60192 3139 123 60192 WK534.3
IC MainBoard: gm5221H-LF
Tuner: 3139 147 23021F
Specifications 20PF5120
PHILIPS 20PF5120
General recommendations for repairing TV LCD
It is recommended that you start the diagnostics of a malfunction of the PHILIPS 20PF5120 / 58 TV, like all other electronic devices, with an external inspection of both external and internal elements and modules. Visible damage to elements can sometimes suggest directions for troubleshooting even before the necessary measurements are taken. Experienced repairmen are often aware of the causes of the defect and the 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.
If the 20PF5120 / 58 TV does not turn on, does not make 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, after replacing the swollen capacitors of the secondary rectifier filters (if any), you must first check the mains fuse. If it breaks, you should check the power switch 6K13S P10NK60ZFP and the rectifier bridge diodes for avalanche (thermal) breakdown.
Power switches in flyback converters fail extremely rarely for no reason and, if they are broken, it is necessary to look for a malfunction in the stabilization circuits by checking electrolytic capacitors, semiconductor devices, and resistors in the primary circuit. The reason may be a malfunction of the TEA1533AP PWM controller chip (8n) pit L6562D (chip) 8n, which can only be checked by replacing with a new or obviously working one.
If the power module uses an active KKM circuit (power factor control), troubleshooting is somewhat more complicated.
If the PHILIPS 20PF5120 / 58 does not have an image, there is sound and the channels are switched, there is a possibility of a malfunction of the display backlight, or their power converter - inverter. Sometimes when you turn on the image appears and disappears immediately. In such cases, it is necessary to check the electrolytic capacitors of the power filter of the inverter itself, including in the secondary rectifier of the main PSU.
When repairing an inverter TCI-D2S F BL6L70P6, it is often necessary to disable protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, in the event of a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
It should be remembered that in such cases there is a risk of failure of the power elements of the inverter and to take special care. After carrying out repairs, the protection circuit must be restored for further safe operation of the TV.
In cases of attempts to repair the motherboard, it is necessary to check the operability of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). Complex repair of MB (SSB) is possible only in the conditions of a service center with the necessary equipment. Testing or replacing elements and microcircuits requires the necessary training and professional skills to repair modules at the component level.
Owners and users of the PHILIPS 20PF5120 / 58 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 20PF5120/58 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).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the BL6L70P3 module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the L6562D PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering were applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the PHILIPS 20PF5120 device:
Installed matrix (LCD panel) A201SN02 V4.
To power the backlight lamps, a converter is used, combined with a power supply unit, controlled by a UBA2070T PWM controller (16). As power elements of the inverter, keys of the 5NM60 type are used.
The necessary supply voltages for all nodes of the PHILIPS 20PF5120 TV are generated by the BL6L70P3 power supply module or its analogs using TEA1533AP, L6562D (PFC) microchips and power switches of the 6K13S, P10NK60ZFP type.
MainBoard - the main board (motherboard) is a module 3139_123_60192, using microchips gm5221H-LF and others.
The tuner 3139 147 23021F provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: AUO
Model: A201SN02 V4
Type: a-Si TFT-LCD, Panel
Diagonal size: 20.1 inch
Resolution: 800x600, SVGA
Display Mode: TN, Normally White, Transmissive
Active Area: 408x306 mm
Surface: Antiglare
Brightness: 450 cd / m²
Contrast Ratio: 500: 1
Display Colors: 16.7M (8-bit), CIE1931 75%
Response Time: 11/5 (Tr / Td)
Frequency: 60Hz
Lamp Type: 6 pcs CCFL Without Driver
Signal Interface: TTL (1 ch, 8-bit), 50 pins
Voltage: 5.0V
