Technical description and composition of the PHILIPS 32PHT4201 TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 32PHT4201 / 60
Chassis / Version: TPN16.2E
Panel: LC320DXY (SH) (A3)
LED driver (backlight): integrated into PSU
PWM LED driver: PF7708BS
MOSFET LED driver: AOD2922
Power Supply (PSU): 715G7734-P01-001-002H
PWM Power: PF6005AS, AOZ3015AI
MOSFET Power: TK6A65D
MainBoard: 715G6947-M02-000-004Y
IC MainBoard: CPU: NT72453, NAND Flash: MX30LF1G08AA, AUDIO: AD87588-LG48NAY
Tuner: ST42CS-2-E, TDQS-A751F
Specifications 32PHT4201
PHILIPS 32PHT4201
General repair guidelines for TV LCD LED
Possible manifestations of defects
- PHILIPS 32PHT4201 does not turn on and does not show any signs of performance at all. Does not blink indicators and does not respond to control buttons.
In some of these cases, a fault is detected in the 715G7734-P01-001-002H power module. It is necessary to measure its output supply voltage, and in case of their absence, check the serviceability of the power switches (TK6A65D) of the converters and rectifier diodes for the probability of breakdown in PN semiconductor junctions.
In case of diode breakdowns in the secondary circuits, the converter can operate in emergency short-circuit mode without output voltages, and during short circuit in the power elements of the primary circuit, the mains fuse and / or current sensor at the source of the key usually 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 the excess of maximum current or voltage values. 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) PF6005AS, AOZ3015AI, 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. Or the image may appear for a second when turned on and immediately disappears.
Often in such cases, there is no LED backlight. The reason for this may be a break in the LED circuit, or a problem in stabilizing their power supply.
When trying to detect a break in the LED lines, it should be taken into account that it is difficult to do this without disassembling the panel. For example, a current source is needed to open PN junctions connected in series.
- The TV does not enter the operating mode, does not respond to the remote control. The indicator on the front panel lights constantly or blinks.
Repair or diagnostics of the 715G6947-M02-000-004Y motherboard should begin by checking the stabilizers and power converters needed to power the microcircuit and matrix. If necessary, update or replace the software (software). Sometimes it is necessary to check or replace (if necessary) the elements of the MainBoard - CPU: NT72453, NAND Flash: MX30LF1G08AA, AUDIO: AD87588-LG48NAY. In cases where the BGA processor is used, its malfunction is usually detected by the local heating method.
If there is no reception of television channels, but the TV is working properly from external devices, first of all it is necessary to check the voltage of the tuner ST42CS-2-E, TDQS-A751F and update the software. The pulses from the I2C bus must be controlled with an oscilloscope.
It should be remembered! Attempts to independently repair the PHILIPS 32PHT4201 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!
Service manual and schematic diagram ---------------------> PHILIPS 32PHT4201 Chassis TPN16.2E
The appearance of MainBoard 715G6947-M02-000-004Y is shown in the figure below:715G6947-M02-000-004Y
The appearance of the power supply
Main features of the PHILIPS 32PHT4201 device:
Installed matrix (LED-panel) LC320DXY (SH) (A3).
To power the backlight LEDs, a converter is used, combined with a power supply, controlled by the PF7708BS PWM controller. As power elements of the LED driver, keys of the AOD2922 type are used.
The necessary supply voltages for all nodes of the PHILIPS 32PHT4201 television are generated by the 715G7734-P01-001-002H power module, or its analogs using PF6005AS, AOZ3015AI microcircuits and TK6A65D type power switches.
MainBoard - the main board (motherboard) is a module 715G6947-M02-000-004Y, using CPU chips: NT72453, NAND Flash: MX30LF1G08AA, AUDIO: AD87588-LG48NAY and others.
Tuner ST42CS-2-E, TDQS-A751F provides the reception of television programs and tuning to channels.
Additional technical information about the panel:
Brand: LG Display
Model: LC320DXY-SHA3
Type: a-Si TFT-LCD, CELL
Diagonal size: 31.5 inch
Resolution: 1366x768, WXGA
Display Mode: IPS, Normally Black, Transmissive
Active Area: 697.685x392.256 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Transmissivity: 6.32% (with Polarizer)
Contrast Ratio: 1200: 1
Display Colors: 16.7M (8-bit)
Response Time: 8/10 (Tr / Td)
Frequency: 60Hz
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V