Technical description and composition of the PHILIPS 23PF9956 TV, panel type and applicable modules. The composition of the modules.PHILIPS
Model: 23PF9956 / 12
Chassis / Version: LC4.2E AA
Panel: LC230W01-A2 K8
Inverter (backlight): 6623L-0030B
PWM Inverter: BIT3106, LM393, AP4532GM
Power Supply (PSU): PLCD150P1
PWM Power: L6562D (PFC), TEA1601T, TEA1533AT
MainBoard: 3139-123-5804.2 WK415.1
IC MainBoard: CPU: TDA12029H; DRAM: K4D263238M-QC50;
Tuner: UR1316 / A I H-3
Specifications 23PF9956
PHILIPS 23PF9956
General recommendations for repairing TV LCD
It is advisable to start the repair of the PHILIPS 23PF9956 / 12 TV with a careful external examination of all its components and modules. Also subject to inspection are body elements, functional control buttons, screen, cords and connectors. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. If ring cracks are detected in the soldering of the terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
If the power supply module malfunctions, the external manifestations may be different, for example, PHILIPS 23PF9956 / 12 does not turn on at all and there is no indication of the indicator lights on the front panel. 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 or power switch.
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 PWM controller chip can also cause a breakdown of the power switch of the converter.
In cases using a power module with an active KKM, troubleshooting is sometimes somewhat more complicated.
Sometimes the PHILIPS 23PF9956 / 12 TV does not have an image, but there is sound, or the image appears and immediately disappears. In this case, there is a high probability of a malfunction of the backlight converter, or of the lamps themselves, which can be checked by replacement. In such cases, it is necessary to verify the serviceability of all electrolytic capacitors of the filter according to the power supply of the inverter itself, including the power supply unit (power supply unit).
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.
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.
Attention to the owners! Attempts at self-repair of the PHILIPS 23PF9956 / 12 TV are not recommended by the manufacturer and can lead to serious negative consequences!
Service manual and schematic diagram 23PF9956/12 Chassis LC4.2E AA
MODELS:17PF9946/12, 23IF9946/12, 23PF9956/12, 23PF9946/12, 26PF9956/12, 26PF9320/10, 26PF8946/12, 26PF9946/12
The appearance of MainBoard 3139-123-5804.2 is shown in the figure below:
3139-123-5804.2
3139-123-5804.2 can be used in televisions:
The appearance of the power supply
Main features of the PHILIPS 23PF9956 device:
Installed matrix (LCD panel) LC230W01-A2 K8.
To power the backlight, an inverter 6623L-0030B is used, it is controlled by the BIT3106, LM393, AP4532GM PWM controller.
The necessary supply voltages for all nodes of the PHILIPS 23PF9956 TV are generated by the PLCD150P1 power supply module or its analogs using L6562D (PFC), TEA1601T, TEA1533AT microcircuits.MainBoard - the main board (motherboard) is a module 3139-123-5804.2, using CPU chips: TDA12029H; DRAM: K4D263238M-QC50; and others.
The tuner UR1316 / A I H-3 provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC230W01-A2K8
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.0 inch
Resolution: 1280x768, WXGA
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 501.12x300.67 mm
