Technical description and composition of the PHILIPS 23PF8946 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 23PF8946 / 58
Chassis / Version: LC4.1E AA
Panel: QD23WL05
T-CON: V23T Rev. A
Inverter (backlight): CIU11-T0013
Power Supply (PSU): PLCD150P1 3122 133 32706
PWM Power: L6562D (PFC), TEA1601T, TEA1533AT
MainBoard: 3139-123-58333 3139 123 58333 WK424.1
IC MainBoard: CPU: TDA15021H; Scaler: GM5221
Tuner: UR1316S / A
Specifications 23PF8946
PHILIPS 23PF8946
General recommendations for repairing TV LCD
Possible malfunctions
- The PHILIPS 23PF8946 TV does not turn on, does not respond to the remote control and the control panel buttons, the indicators do not light or flash.
Typically, with such manifestations, the defect is caused by faulty elements in the PLCD150P1 main power module. It is necessary to measure the output voltages in its secondary circuits, and if they are completely absent, it is necessary to check the serviceability of power switches and rectifier diodes for possible breakdown (short circuit).
In the event of breakdowns in the secondary circuits of the converter, it can usually fail in short circuit mode, and in the event of a short circuit in the power elements of the primary circuit, the mains fuse or current sensor at the source of the key most often breaks.
Mos-Fet keys used in switching power supplies usually fail due to a malfunction of other elements that can put it out of operation in key mode or provoke an excess of the maximum current or voltage. These can be circuits supplying the PWM controller, damping or frequency-setting circuits, or elements of OOS (negative feedback) in the stabilization circuit. PWM controllers (PWM) L6562D (PFC), TEA1601T, TEA1533AT, in the absence of external damage and short circuit between the terminals, are checked by replacing with obviously good ones.
- 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 blinks or lights constantly, the TV does not turn on, does not respond to the remote control.
Repair or diagnostics of the motherboard 3139-123-58333 should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). When repairing an MB board, you need to check its CPU components: TDA15021H; Scaler: GM5221. Defective items should be replaced. If chips with BGA soldering technology are used, a problem in its implementation is detected by the local heating of the chip.
Before replacing the tuner UR1316S / A, if there is no tuning to the channels, you must first check the software and the supply voltage at its terminals. It is also necessary to make sure that the tuner and processor can exchange data via the I2C bus
It should be remembered! Attempts to independently repair the PHILIPS 23PF8946 TV, in the absence of the necessary qualifications and experience, are categorically not recommended and are fraught with negative consequences, up to the complete non-repairability of the device!
23PF8946/58 AUDIO BOARD: 3139 123 58831, AV BOARD: 3139 188 66882 (3139 123 58311).
Service manual and schematic diagram 23PF8946/58 Chassis LC4.1E AA
MODELS: 14PF7846, 15PF8946, 17PF8946, 20PF8846, 20PF7846.
The appearance of MainBoard 3139-123-58333 is shown in the figure below:3139-123-58333
3139-123-58333 can be used in TVs:
PHILIPS 20PF8846 (Panel 20 inch), PHILIPS 23PF8946 / 58 (Panel QD23WL05).
The appearance of the power supply
Main features of the PHILIPS 23PF8946 device:
Installed matrix (LCD panel) QD23WL05.
The matrix control uses the Timing Controller (T-CON) V23T.
To power the backlight used inverter CIU11-T0013.
The necessary supply voltages for all nodes of the PHILIPS 23PF8946 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 3139-123-58333, using CPU chips: TDA15021H; Scaler: GM5221 and others.
The tuner UR1316S / A provides TV reception and channel tuning.
