Technical description and composition of the PHILIPS 17PF9945 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 17PF9945 / 58I
Chassis / Version: LC03E AA
Panel: LC171W03-A4
Inverter (backlight): CK66
PWM Inverter: OZ960S (20)
MOSFET Inverter: AO 4600 (8)
Trans Inverter: 22.077.39 0413
Power Supply (PSU): adapter 12v 5a SA165A-1250V-3
MainBoard: 3139-123-5680.3 3139 123 5682.2 WK317.5
IC MainBoard: CPU: SAA5667HL / M1; Scaler: JAGASM-A4; DRAM: K4S643232E-TC50; EEPROM: 24C256;
Tuner: UR1316 / A
Specifications 17PF9945
PHILIPS 17PF9945
General recommendations for repairing TV LCD
Any repair of electronic equipment usually begins with a careful external inspection of the device and troubleshooting. In this case, you should inspect all the elements of the PHILIPS 17PF9945 / 58I TV, both internal and external. Often, according to the external signs and the nature of some damage to the elements, it is possible to draw preliminary conclusions and determine a further algorithm for troubleshooting and localizing the malfunction before carrying out the necessary measurements and taking oscillograms at control points. Elements with visible damage, for example, capacitors swelled up after boiling the electrolyte, charred resistors in certain nodes of the circuit, as well as ring cracks in solders will help the master to guess the causes and possible consequences of the malfunction.
Sometimes the PHILIPS 17PF9945 / 58I TV simply does not 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 general power adapter adapter 12v 5a SA165A-1250V-3. In the general case, first of all, it is necessary to check the electrolytic capacitors of the secondary rectifier filters and the fuse at the input of the network. If it is broken, then you should check for breakdown of the PN junctions of the rectifier bridge diodes and the key transistor of the N-FET converter, which can either be on a separate radiator or integrated with a PWM controller in a common chip. Possible options.
In most cases, a breakdown of the N-Fet converter key does not occur for no reason and you should look for other faulty circuit elements that could provoke a defect. This can be dried electrolytic capacitors in the primary circuit, and faulty damper elements, as well as dangling resistors or punched semiconductor elements in the stabilization circuits. Possible defective PWM chip from the manufacturer.
When using a power factor correction unit (PFC) in the power modules, troubleshooting becomes somewhat more complicated and requires additional experience and knowledge of their operation.
If PHILIPS 17PF9945 / 58I 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.
When repairing the CK66 inverter, it is often necessary to disable the protection for diagnostics, which, for the purpose of fire safety, turns it off in any emergency situation, for example, during a malfunction or uneven wear of the lamps, which makes it difficult to find a defect.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Once again, remind users! Attempts to independently repair the PHILIPS 17PF9945 / 58I TV without the appropriate qualifications and experience can lead to its complete non-repairability!
Service manual and schematic diagram 17PF9945/58I Chassis LC03E AA
FOR MODELS: 15PF9936, 17PF9945, 23PF9945
The appearance of MainBoard 3139-123-5680.3 is shown in the figure below:3139-123-5680.3
3139-123-5680.3 can be used in televisions:
PHILIPS 15PF9936 / 12 (Panel LC151X01-C3P1), PHILIPS 17PF9945 / 58I (Panel LC171W03-A4).
Main features of the PHILIPS 17PF9945 device:
Installed matrix (LCD panel) LC171W03-A4.
The CK66 inverter is used to power the backlight, controlled by the OZ960S PWM controller (20). A transformer 22.077.39 0413 is installed in the inverter converter. AO 4600 type switches (8) are used as power elements of the inverter.
To power all the internal components of the PHILIPS 17PF9945 TV, an external adapter type 12v 5a SA165A-1250V-3 is used.
MainBoard - the main board (motherboard) is a module 3139-123-5680.3, using CPU chips: SAA5667HL / M1; Scaler: JAGASM-A4; DRAM: K4S643232E-TC50; EEPROM: 24C256; and others.
The tuner UR1316 / A provides television reception and channel tuning.
Additional technical information about the panel:
Brand: LG.Philips LCD
Model: LC171W03-A4KG
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)
