Technical description and composition of the PHILIPS 24PFL2908H TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 24PFL2908H / 60
Chassis / Version: VES1.1E LA
Panel: V236BJ1-LE1 Rev. C2
T-CON: V236BJ1-XCE1
LED driver (backlight): 17C0N07-03 10082759
PWM LED driver: MPS 1305 MP3389EF
MOSFET LED driver: FDS7N10L (3)
Power Supply (PSU): 17IPS61-2 Vestel
PWM Power: ICE3B0665J (8)
MainBoard: 17MB62-2.6 (PHI)
IC MainBoard: 3503 MP-G1 2435GH (8), TR (6), RT7297AH (8), 9ECM 041 (6)
Tuner: TDSV-G002D
Control: on m / s HB8102P (16)
Technical Specifications 24PFL2908H
PHILIPS 24PFL2908H
General repair guidelines for TV LCD LED
Diagnostics of malfunctions and repairs of PHILIPS 24PFL2908H / 60, as well as other electronic devices, is recommended to begin with an external examination of the external and internal elements. According to some external signs of a change in the state of some elements, it is sometimes possible to make assumptions about the nature of the defect, as well as determine the further direction of the troubleshooting. Electrolytic capacitors of filters with a swollen body, as well as ring cracks or a layer of coal on burned-out resistors formed in the soldered terminals of the heating elements, sometimes tell the repairman the causes of the malfunction and possible consequences.
Sometimes the PHILIPS 24PFL2908H 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 17IPS61-2P Vestel common power supply module,. If it is working properly, you need to check the processor batteries on the SSB (Main Board). In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should begin by checking the fuse and, if it is broken, it is first necessary to check all the power semiconductor elements of the primary circuit - diodes and transistors for the possibility of an avalanche or thermal breakdown.
It should be borne in mind that in the practice of repair it is extremely rare that key transistors in switching power supplies (SMPS) fail for no reason that should be sought by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, or dried electrolytic capacitors or dangling primary resistors BP circuits involved in the stabilization process. In this case, all semiconductor elements of the strapping of the ICE3B0665J PWM controller microcircuit (8) are subject to verification, which it is desirable to verify by replacement.
If the PHILIPS 24PFL2908H has no image, there is sound and the channels are switched, there is a possibility of a malfunction in the backlight LED circuit of the V236BJ1-LE1 Rev.C2 panel, or their power converter - LED driver. 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 LED driver itself, including in the secondary rectifier of the main PSU.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
To detect a break in the LED lines without disassembling the panel, a current source is required. It is impossible to open transitions connected in series with a simple multimeter; voltage of several tens of volts is necessary.
The motherboard 17MB62-2.6 (PHI) must be checked if there is no reaction to the remote control and function buttons, the standby indicator blinks or lights up continuously. In such cases, if the converters or power regulators of the microcircuit are working, a software update may be necessary.
In some cases, to repair the MB (SSB) board, it may be necessary to replace the chips - 3503 MP-G1 2435GH (8), TR (6), RT7297AH (8), 9ECM 041 (6) with new or obviously working ones. In cases where BGA technologies are used, defects are usually localized by the heating method.
If you suspect that the TDSV-G002D tuner is malfunctioning, first of all, you need to make sure that the voltage of the varicaps (30-33V) is on the corresponding output of the tuner, as well as other voltage supplying it.
Owners and users of the PHILIPS 24PFL2908H TV must 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 24PFL2908H/60 Chassis VES1.1E LA
MODELS: 19PFL2908H, 22PFL2807H, 22PFL2908H, 24HFL2808D, 24PFL2908H, 26HFL2808D, 26PFL2908H, 32PFL2807H.
PSU SCHEMATIC ---------------------> 17IPS61-2
To reduce the backlight current in LED drivers with a PWM controller MP3389EF (MP3389), or its analogue OB3362VP (28 pin), it is necessary to proportionally increase the total resistance of the resistors from pin 9 (ISET) to the chassis. The maximum current in each of the 12 channels (in milliamps) for the resistance Rset (in kilo-ohms) is determined from the ratio 1000 * 1.22V / Rset. With a parallel connection of channels, currents are summed.
The appearance of the MainBoard 17MB62-2.6 is shown in the figure below:
The 17MB62-2.6 motherboard is made using the MSD9WB9PT-2 processor, combined with a scaler. For its operation, random-access memory (DDR) K4T1G164QF, or HY5PS121621C, and NAND512-A read-only memory (ROM) are used. To ensure processor power, DC / DC converters with output voltages of 1.2V, 2.5V, 3.3V are used. For DDR, the voltage is 1.8V, for NAND it is either 1.8 or 3.3V. It is advisable to start the repair by checking the supply voltage in stand-by mode (12V), 5V and 3.3V. Further, in the operating mode, it is necessary to check the operability of all linear stabilizers and DC / DC voltage converters used to power the MB and LCD panel chips. If there is a backlight and no image, depending on the type of panel used, its 5V or 12V power supply can be measured directly on the LVDS connector.
A typical malfunction of this board is a NAND software failure. At the same time, the TV does not turn on and blinks alternately with indicators on the panel. If the software of the SPI FLASH chip, in which the bootloader is located, is not damaged, NAND is updated via the USB port with standard software. Otherwise, it makes sense to try downloading the software if there is a mboot.bin file on the media, which can be used as standard SPI FLASH content.
17MB62-2.6 can be used in TVs:
PHILIPS 19PFL2908H/60 (Panel HT185WX1-300), PHILIPS 22PFL2807H/60 (Panel LM215WF4 (TL)(G1)), PHILIPS 24PFL2908H/60 (Panel V236BJ1-LE1 Rev.C2), PHILIPS 22PFL2908H/60 (Panel M215HGE-L21 ), SHARP LC-22LE240RUX (Panel 22 ), SHARP LC-40LE240RUX (Panel LTA400HM13 C04), SHARP LC-32LE140RU LC-32LE140 (Panel LC320EXN), TOSHIBA 23KL934R (Panel LTM230HT10 75029655), TOSHIBA 32KL934R (Panel LTA320AN12 T01).
The appearance of the power supply
Main features of the PHILIPS 24PFL2908H device:
Installed matrix (LED-panel) V236BJ1-LE1 Rev.C2.
The matrix control uses the Timing Controller (T-CON) V236BJ1-XCE1.
The LED driver 17C0N07-03 is used to power the backlight LEDs, it is controlled by the MPS 1305 MP3389EF PWM controller. As power elements of the LED driver, keys of the FDS7N10L type (3) are used.
The necessary supply voltages for all nodes of the PHILIPS 24PFL2908H TV are generated by the 17IPS61-2 power module or its analogs using ICE3B0665J microcircuits (8).
MainBoard - the main board (motherboard) is a 17MB62-2.6 module, with the use of chips 3503 MP-G1 2435GH (8), TR (6), RT7297AH (8), 9ECM 041 (6) and others.
The TDSV-G002D tuner provides TV reception and channel tuning.
Additional technical information about the panel:
Brand: CHIMEI INNOLUX
Model: V236BJ1-LE1
Type: a-Si TFT-LCD, Panel
Diagonal size: 23.6 inch
Resolution: 1366x768, WXGA
Display Mode: MVA, Normally Black, Transmissive
Active Area: 521.471x293.184 mm
Surface: Antiglare (Haze 1%), Hard coating (3H)
Brightness: 250 cd / m²
Contrast Ratio: 3000: 1
Display Colors: 16.7M (6-bit + Hi-FRC), CIE1931 72%
Response Time: 8.5 (G to G)
Frequency: 60Hz
Lamp Type: WLED Without Driver
Signal Interface: LVDS (1 ch, 8-bit), 30 pins
Voltage: 12.0V
