Technical description and composition of the PHILIPS 42PFL7623D TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 42PFL7623D / 10
Chassis / Version: Q529.1E LA
Panel: LC420WUE - SAA1
T-CON: 6870C-4200C
Power Supply (PSU): 310432852763 PSU - 3104 303 50815B - 3104 313 61935B
PWM Power: UBA2071AS, 1606B (PFC)
MainBoard: 3104.303.51026 - 3104.313.62146 SSB
IC MainBoard: PNX8541E / 2414, AD8197A ASTZ, 1SP1564HL
Tuner: TD1716F / BHXP-4
Control: RC4450 / 01B Ambilight
Specifications 42PFL7623D
PHILIPS 42PFL7623D
General recommendations for repairing TV LCD
It is advisable to start the repair of a PHILIPS TV with the Q529.1E LA chassis with a careful external examination of both internal and external elements. Often, by the external signs and nature of the damage to the elements, it becomes possible to draw some conclusions and determine a further algorithm for finding a defect before making the necessary measurements at control points. 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 significant clue in the assumptions about the causes and consequences of the malfunction.
Sometimes the PHILIPS 42PFL7623D TV just doesn’t turn on. No control lights on the front panel are lit or blinking, the TV does not respond to the remote control and does not make any sounds or any signs of life when turned on. The most likely cause of the malfunction is the failure of the HJ821.28.B common power supply module. If it is working properly, you need to check the processor batteries on the SSB (Main Board). When diagnosing and repairing the power supply, first of all, replace the swollen filter capacitors of the secondary rectifiers and check the fuse and, if it is broken, it is necessary to identify the cause. Often in such cases, an avalanche (thermal) breakdown is detected in the power semiconductor elements of the module — rectifier diodes and transistors in the primary circuit.
Power switches in pulsed power supplies (SMPS) 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 cause may be a malfunction of the UBA2071AS, 1606B PWM controller chip, which can only be checked by replacing it with a new or obviously working one.
If the PHILIPS 42PFL7623D 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. If in diagnosing a malfunction, it is necessary to disable the inverter protection, there is a risk of failure of the power elements of the inverter, and special care is required during work, and after they are finished, it is necessary to restore the protection circuits for further safe operation of the TV by the owner in normal mode.
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). In some cases, it is necessary to check or replace (if necessary) the elements of the MB board (SSB) - PNX8541E / 2414, AST8 AD8197A, 1SP1564HL. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
Attention to users! Do-it-yourself repair of the PHILIPS 42PFL7623D TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram 42PFL7623D/10 Chassis Q529.1E LA
3104.303.51026
3104.303.51026 can be used in TVs:
PHILIPS 32PFL7623D/10 (Panel LC320WXN-SAB1 code 136), PHILIPS 32PFL9603D/10 (Panel LK315D3LZ43), PHILIPS 32PFL9613 (Panel 32 ), PHILIPS 37PFL9603D/10 (Panel LC370WUF-SAB1 p/n: 932226169682), PHILIPS 37PFL9603D/10 (Panel LC370WUF SAB1 (LGPH) code 141), PHILIPS 42PFL7403S/60 (Panel p/n: 932225845000), PHILIPS 42PFL7623D/10 (Panel LC420WUE - SAA1), PHILIPS 42PFL9703D/10 (Panel LC420WUF-SAC1), PHILIPS 42PFL9703D/10 (Panel LC420WUF-SAC1 code 143), PHILIPS 42PFL9803H/10 (Panel T420HW02 V.1 code 149 p/n: 932226404682 ).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the module 310432852763 provides for the use of the Power Factor Correction unit. The PFC circuit is a 1606B PWM boost converter. 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 was 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 42PFL7623D device:
Installed matrix (LCD panel) LC420WUE - SAA1.
The matrix control uses the Timing Controller (T-CON) 6870C-4200C.
The necessary supply voltages for all nodes of the PHILIPS 42PFL7623D TV are generated by the power supply module 310432852763, or its analogs using microcircuits UBA2071AS, 1606B (PFC).
MainBoard - the main board (motherboard) is a module 3104.303.51026, using chips PNX8541E / 2414, AD8197A ASTZ, 1SP1564HL and others.
The tuner TD1716F / BHXP-4 provides reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC420WUE-SAA1
Type: a-Si TFT-LCD, Panel
Diagonal size: 42 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 930.24x523.26 mm
Surface: Antiglare (Haze 13%), Hard coating (3H)
Brightness: 500 cd / m²
Contrast Ratio: 1300: 1
Display Colors: 16.7M / 1.06B (8-bit / 8-bit + Dithering)
Response Time: 5 (G to G)
Frequency: 60Hz
Lamp Type: 18 pcs EEFL Without Driver
Signal Interface: LVDS (2 ch, 8/10-bit), 51 pins
Voltage: 12.0V