Technical description and composition of the PHILIPS 42PFL5028T TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 42PFL5028T / 60
Chassis / Version: TPM10.1E LA
Panel: LC420EUE (FF) (F1) code 190
LED backlight: 6922L-0056
T-CON: 6870C-0451A
LED driver (backlight): integrated into PSU
PWM LED driver: PF7900S, PF7700A
Power Supply (PSU): 715G5778-P02-000-002R
PWM Power: SSC9522S (PWM Resonant), R2A20133ESP (PFC), A6069H (Standby)
MOSFET Power: 8NM50N, 24MN60N
MainBoard: 715G5713-M0E-000-005K, 715G5766-R01
IC MainBoard: CPU: MT5580MPOI; DRAM: H5TQ2G83DFR; NAND Flash: TC58NVG2S3ETAI0; SOUND: STA3818
Tuner: TDSY-G230D
Control: 2426891F0394 398GR8BD6NTPHT
Specifications 42PFL5028T
PHILIPS 42PFL5028T
General repair guidelines for TV LCD LED
PHILIPS 42PFL5028T / 60, like other televisions, it is advisable to start repairing with a careful examination of the external and internal elements and modules. 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. In some cases, faulty elements can be seen with the naked eye, for example, charred resistors or swollen metal-ceramic capacitors, or electrolytic in rectifier filters. Ring cracks formed in the soldered terminals of transformers or heating elements of the circuit are also frequent sources of many malfunctions with a variety of external manifestations.
If the 42PFL5028T TV does not turn on, does not make any sounds when it is turned on, and also no indicators on the front panel light or blink - there is a high probability of a malfunction in the power supply module. In some cases, only the regulator or power converter of the control processor may be faulty, which is typical for some PHILIPS models. It is advisable to start the troubleshooting of the power supply module by checking the state of the electrolytic capacitors of the rectifier filters and the mains fuse. Defective capacitors should be replaced. If the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and transistors 8NM50N, 24MN60N, which are often found in such a state of breakdown.
If a breakdown of the power switch is detected, it should be remembered that in a switching power supply (IIP) it does not fail by itself for no reason that you should look for when checking other elements of the primary circuit - electrolytic capacitors, PWM controller A6069H (7), , which can be checked only by replacement, as well as other semiconductor elements (diodes, transistors, zener diodes).
If the PHILIPS 42PFL5028T TV does not have an image, but there is sound, there may be a malfunction in the LED backlight circuits of the LC420EUE (FF) (F1) panel code 190. It is also necessary to check the operability of the electrolytic capacitors of the filter of the secondary rectifiers of the BP (power supply unit) for an overestimated ESR.
To check the health of the LEDs, as well as contact connections in the ruler circuit, it is necessary to disassemble the panel.
It should be remembered that it is not possible to determine the open circuit in the LED lines without disassembling the panels with a tester or multimeter without an additional device, for example, a current source. To open all PN junctions connected in series at once, a voltage of several tens of volts may be required.
On the motherboard 715G5713-M0E-000-005K, 715G5766-R01, in case of a malfunction, you should first check the operation of all the stabilizers or power converters of the microcircuits and, if necessary, update the software (software).
In cases of attempts to repair the MB (SSB) board, it is necessary to check the serviceability of its elements - STA3818W, 54518 (16) which may require replacement with new ones. If a BGA processor is installed, there is a possibility of a violation of the soldering of the contacts of its conclusions with the board (it is diagnosed by heating).
In cases where there is no tuning to the local television channels, you should make sure that there is a varicap supply voltage (30-33V) and other supply voltages at the terminals of the TDSY-G230D tuner.
Attention! For users and owners of 42PFL5028T TVs who do not have the appropriate qualifications, knowledge and experience, we strongly recommend against attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
SCHEMATIC MANUAL ----------> 42PFL5028T/60 Chassis TPM10.1E LA part1, part2, part3
The appearance of the MainBoard 715G5713-M0E-000-005K is shown in the figure below:715G5713-M0E-000-005K
715G5713-M0E-000-005K can be used in TVs:
PHILIPS 39PFL4208T/60 (Panel TPT390J1-HJ1L02 code 199), PHILIPS 42PFL3008T/60 (Panel TPT420H2-HVN04 code 194), PHILIPS 42PFL3208T/60 (Panel TPT420H2-HVN04 Rev080C code 194), PHILIPS 42PFL5028T/60 (Panel LC420EUE (FF)(F1) code 190), PHILIPS 50PFL5038T/60 (Panel LC500EUE FFF1).
PSU Advanced
A 4215G5778-P02-000-002R power supply module is installed in the 42PFL5028T / 60 TV using the PFC (Power Factor Correction) scheme acting as an active filter to eliminate higher harmonic components of the current consumption. The boost converter based on the R2A20133ESP PWM controller does not allow the input rectifier filter's electrolytic capacitor to be connected to the network directly through open diodes when the charge current determines its reactance (about 15-30 ohms at a frequency of 50 Hz). As a result of the conversion, the charging current of the capacitor will be determined in such a way that the envelope of the high-frequency pulses of the input current will repeat the phase and shape of the sine wave of the input voltage. The health check of the PFC unit is carried out by measuring the DC voltage on the capacitor of the rectifier network. In operating mode, it should be around 380V, in standby approximately 300V.
The appearance of the power supply
Main features of the PHILIPS 42PFL5028T device:
Installed matrix (LED-panel) LC420EUE (FF) (F1) code 190.
The matrix control uses the Timing Controller (T-CON) 6870C-0451A.
To power the backlight LEDs, a converter is used, combined with a power supply unit, controlled by the PF7900S, PF7700A PWM controller.
The necessary supply voltages for all nodes of the PHILIPS 42PFL5028T TV are generated by the 715G5778-P02-000-002R power supply module or its analogs using SSC9522S (PWM Resonant), R2A20133ESP (PFC), A6069H (Standby) microcircuits, and 8NM50N, 24MN60N power switches.
MainBoard - the main board (motherboard) is a 715G5713-M0E-000-005K module, using CPU chips: MT5580MPOI; DRAM: H5TQ2G83DFR; NAND Flash: TC58NVG2S3ETAI0; SOUND: STA3818 and others.
The TDSY-G230D tuner provides TV reception and channel tuning.