Technical description and composition of the PHILIPS 17PF8946 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 17PF8946 / 58
Chassis / Version: LC4.1E AA
Panel: LC171W03 (A4) (KC)
T-CON: 6870S-0078G
Inverter (backlight): integrated into PSU
PWM Inverter: UBA2070T
MOSFET Inverter: D5NM60
Power Supply (PSU): BL6L70P1 3122 133 32851
PWM Power: TEA1533AT, L6562D
MOSFET Power: 4NK80, 10NK60
MainBoard: 3139-123-58333 3139 123 58333 Wk424.1
IC MainBoard: CPU: TDA15021H; Scaler: GM5221
Tuner: UR1316S / A
Control: IR: 3139 123 58361 WK418.3
Specifications 17PF8946
PHILIPS 17PF8946
General recommendations for repairing TV LCD
Possible manifestations of defects
- The PHILIPS 17PF8946 TV does not turn on, does not respond to the remote control and buttons on the control panel, does not light up or blink indicators.
Most likely in this case, the main switching power supply (IIPS) BL6L70P1 is faulty. It is necessary to measure its output voltages, and in case of their absence, check the serviceability of power switches (4NK80, 10NK60) of converters and rectifier diodes for a short circuit probability.
In case of breakdowns in the secondary circuits, the converter, as a rule, can emergency work in the short circuit mode, and during short circuit in the power elements of the primary circuit, the mains fuse usually breaks.
Breakdown of power switches (MosFet) in pulsed sources is sometimes caused by malfunctions of other circuit elements, for example, in circuits supplying a PWM controller, frequency-setting or damper ones, as well as in negative feedback circuits (OOS) of stabilization. PWM controllers (PWM) TEA1533AT, L6562D, if they do not have visible damage to the case and open fault between the terminals, are usually checked by replacement.
- There is no image, there is sound, it is responding to the remote control. Or immediately after turning on for a second, the image may appear and immediately disappear.
These manifestations can be triggered by a power module, or by defects in the inverter, as well as a distortion of the currents in the lamps due to their uneven wear. After checking all the electrolytic capacitors of the filters that are involved in the power supply of the inverter, it is necessary to ring in its converter the power switches for breakdown and the secondary windings of the transformers for an open.
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.
- 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 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). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - CPU: TDA15021H; Scaler: GM5221 for new or obviously working. In cases where BGA technologies are used, defects are usually localized by the heating method.
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
Owners and users of the PHILIPS 17PF8946 TV should 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 -------------------> PHILIPS 17PF8946/58 Chassis LC4.1E AA
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 17PF8946 device:
Installed matrix (LCD panel) LC171W03 (A4) (KC).
The matrix control uses the Timing Controller (T-CON) 6870S-0078G.
To power the backlight, a converter is used, combined with a power supply, controlled by a UBA2070T PWM controller. As power elements of the inverter, keys of the D5NM60 type are used.
The necessary supply voltages for all nodes of the PHILIPS 17PF8946 TV are generated by the BL6L70P1 power module or its analogs using TEA1533AT, L6562D microcircuits and power switches of the 4NK80, 10NK60 type.
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.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC171W03-A4KC
Type: a-Si TFT-LCD, Panel
Diagonal size: 17.1 inch
Resolution: 1280x768, WXGA
Display Mode: Transmissive
Active Area: 372.48x223.488 mm
Display Colors: 16.7M
Frequency: 60Hz
Lamp Type: 6 pcs CCFL
Signal Interface: LVDS (1 ch, 8-bit)
