Technical description and composition of the PHILIPS 20HF5474 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 20HF5474 / 10
Chassis / Version: LC4.1HE AB
Panel: LC201V02 (SD) (D1)
Inverter (backlight): integrated into PSU
Power Supply (PSU): BL6L60P7 3341 101 20041
MainBoard: 3139_123_60192 3139 123 60192 Wk534.3
IC MainBoard: P89C664, GM5221H-LF, TDA15021H1, M24C32, MX29LV040QC, TDA1517ATW
Tuner: UR1316
Specifications 20HF5474
PHILIPS 20HF5474
General recommendations for repairing TV LCD
Possible malfunctions
- The PHILIPS 20HF5474 TV does not turn on and does not show any signs of operability at all. There is no reaction to either the remote control or the front panel control buttons.
In most of these cases, the BL6L60P7 main switching power supply is faulty. It is necessary to measure its output voltages and, in case of their absence, check the serviceability of power switches and rectifier diodes in the converters for possible breakdown.
During thermal or avalanche breakdowns of semiconductors in the secondary circuits of any converter, as a rule, it can operate in emergency short circuit mode without output voltages, and during short circuit in the elements of the primary circuit, the main fuse and, less often, the current sensor at the source of the key are most often cut off.
The breakdown of Mos-Fet keys used in pulsed sources is often caused by malfunctions of other elements, for example, power, frequency-setting, damper ... as well as elements of the Negative Stabilization Feedback. The PWM chip can also cause a malfunction of the power switch of the converter and is checked by replacement.
- There is no image, there is sound, it responds to the remote control, the channels are switched. In some cases, the image appears when you turn on and immediately disappears.
These manifestations can be triggered by the power module, or by inverter defects, as well as by the 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 on the front panel blinks, the TV does not turn on in the operating mode, it does not respond to the remote control.
Repair or diagnostics of the 3139_123_60192 motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sophisticated MB board repair (SSB) is in some cases possible and practiced by repairmen. To do this, check and, if necessary, replace the elements P89C664, GM5221H-LF, TDA15021H1, M24C32, MX29LV040QC, TDA1517ATW. BGA chip malfunctions are usually easy to detect by warming up.
If the TV works normally from external devices, but does not tune into television channels, the tuner UR1316 may be malfunctioning. In such cases, first of all, you should make sure that there are supply voltages at its corresponding conclusions. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus. Sometimes the cause of the inoperability of the tuner may be a software failure.
We recommend the owners of the 20HF5474 TV for repair only to qualified specialists with the necessary work experience! Self-repair attempts without the appropriate knowledge and skills can lead to irreversible negative consequences!
Service manual and schematic diagram -----------------------> PHILIPS 20HF5474 Chassis LC4.1HE AB
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 20HF5474 device:
Installed matrix (LCD panel) LC201V02 (SD) (D1).
To power the backlight, a converter is used, combined with a power supply.
The formation of the necessary supply voltages for all nodes of the PHILIPS 20HF5474 TV is carried out by the BL6L60P7 power module, or its analogues.
MainBoard - the main board (motherboard) is a module 3139_123_60192, using chips P89C664, GM5221H-LF, TDA15021H1, M24C32, MX29LV040QC, TDA1517ATW and others.
The tuner UR1316 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC201V02-SDD1
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: 300 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
