Technical description and composition of the PHILIPS 37PFL4606H TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 37PFL4606H / 60
Chassis / Version: TPM7.1E LA
Panel: LC370WUY-SCA1
Inverter (backlight): 715G4546-P03-H20-003U
PWM Inverter: UBA2071AT
MOSFET Inverter: TF10N60
Power Supply (PSU): 715G4546-P02-H20-003E 715G4546-P03-H20-003U
PWM Power: TOP264VG, NCP1271, FAN6961 (PFC)
MOSFET Power: 3NK60
MainBoard: 715G4481-M03-000-005X CBPFB4SBZBS1A
IC MainBoard: maxim17113E, maxim9668E, TPS65192, TMDS351 (HDMI), sound: STA3398W
Tuner: ENV57U09D5F
Control: 2422 549 90301, IR: 715G4958-K01-000-004B
Specifications 37PFL4606H
PHILIPS 37PFL4606H
General recommendations for repairing TV LCD
It is advisable to start any repair and diagnostics of the PHILIPS 37PFL4606H / 60 TV, as well as other devices, with a careful external examination of internal and external elements, including case parts, a display, buttons and cables. Specific external damage to the elements can sometimes prompt further actions to determine the malfunction of the TV and localize the defect before starting the necessary measurements and taking waveforms. If ring cracks are detected in the soldered terminals of the elements or dangling connecting tracks, swollen capacitors or charred resistors - all this can be characteristic signs of the causes or consequences of an already known typical malfunction.
Power Module Repair
If the 37PFL4606H / 60 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 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. In case the mains fuse is broken, it is necessary to check first of all the power semiconductor elements - rectifier diodes and the power switch of the 3NK60 converter, which are often found in a breakdown state in such situations.
The reasons for the breakdown of the power switch of the flyback converter of the power module can be different, for example, a malfunction of semiconductor cells or electrolytic capacitors in the stabilization circuits of the primary circuit, as well as a failure in the operation of the TOP264VG NCP1271 FAN6961 PWM controller chip or breakage of the resistors in its bundle.
In cases where the Power Factor Corrector (PFC) is used in the power supply, troubleshooting can be a bit more complicated.
Inverter Repair
If, when you turn on the TV, the image appears and immediately disappears, or is initially absent when you turn on, but there is sound and other functions work, there is a high probability of a malfunction of the inverter (power converter for the backlight). In such cases, the lamps, the inverter and the common power module are subject to verification, in which the electrolytic capacitors of the rectifier filter feeding the inverter should be checked.
In most cases, the diagnosis and repair of the 715G4546-P03-H20-003U inverter is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits in high voltage circuits and during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the inverter control points to identify the causes of the defect.
All necessary precautions must be observed when disabling the inverter protection during diagnostics and not leaving it disconnected after the repair is completed.
Repair Main Board
In cases of attempts to repair the motherboard, it is necessary to check the operability of the stabilizers or power converters of its microcircuits and, if possible, update the software (software). In some cases, you need to check or replace (if necessary) the elements of the MB board (SSB) - sound STA3398W maxim17113E maxim9668E TPS65192 TMDS351 (HDMI).
Attention! For users and owners of 37PFL4606H / 60 TVs who do not have the appropriate qualifications, knowledge and experience, we categorically do not recommend attempting self-repair in order to avoid negative consequences that could lead to complete non-repairability of the device.
Service manual and schematic diagram 37PFL4606H/60 Chassis TPM7.1E LA
The appearance of the MainBoard 715G4481-M03-000-005X is shown in the figure below:715G4481-M03-000-005X
PSU Advanced
The 37PFL4606H / 60 model uses a 715G4546-P02-H20-003E power supply unit using the PFC (Power Factor Correction) node - an active filter of higher harmonics of the current consumption. In fact, this is a boost converter based on the FAN6961 PWM controller, which eliminates the charge current of the electrolytic capacitor of the rectifier filter directly from the network through open diodes, when its charging current is determined by its reactance.
As a result of the operation of the converter, the envelope of the high-frequency pulses of the input current of the converter will repeat the shape and phase of the input voltage. The health of the PFC node can be indirectly judged by the presence of an increased constant voltage (about + 380V) on the capacitor of the rectifier network in operating mode.
The appearance of the power supply
Main features of the PHILIPS 37PFL4606H device:
Installed matrix (LCD panel) LC370WUY-SCA1.
To power the backlight, an inverter 715G4546-P03-H20-003U is used, it is controlled by the PWM controller UBA2071AT. Keys of type TF10N60 are used as power elements of the inverter.
The necessary supply voltages for all nodes of the PHILIPS 37PFL4606H TV are generated by the 715G4546-P02-H20-003E power module or its analogs using TOP264VG, NCP1271, FAN6961 (PFC) microcircuits and 3NK60 type power switches.
MainBoard - the main board (motherboard) is a 715G4481-M03-000-005X module, using microchips maxim17113E, maxim9668E, TPS65192, TMDS351 (HDMI), sound: STA3398W and others.
The ENV57U09D5F tuner provides TV reception and channel tuning.