Technical description and composition of the PHILIPS 37PFL7605H TV, type of panel and applicable modules. The composition of the modules.PHILIPS LED
Model: 37PFL7605H / 60
Chassis / Version: Q552.1E LA
Panel: LC370EUH (SC) (A1) p / n: 932227578682
LED driver (backlight): PLDD-P973A 2722 171 00973
PWM LED driver: CAT4026V (28)
MOSFET LED driver: MJD340 (3)
Trans LED driver: 2NP000075DA-R
Power Supply (PSU): PLDD-P973A 2722 171 00973
PWM Power: FSQ510 (7), HS01G (PFC), FAN7621B (16)
MOSFET Power: KF5N50
MainBoard: 3104_313_63643 3104 313 63643 // 310432814002
Tuner: 3104 328 62941
Control: 313923819861 RC2683203 / 01
PHILIPS LED
Model: 37PFL7605H / 60
Chassis / Version: Q552.1E LA
Panel: LC370EUH (SC) (A2)
T-CON: 20U65CT, 1A44AF, BYV25X
LED driver (backlight): PLDD-P973A (PSL37
PWM LED driver :)
MOSFET LED driver: CAT4026V (28)
Trans LED driver: RC2683203 / 01 3139 238 19861
Power Supply (PSU): PLDD-P973A
MOSFET Power: VA51 FSQ510 (7), HS01G (8), FAN7621B (16), MJD340 (3)
MainBoard: 3104_313_63643 3104 313 63643 // 310432862931
Control: tun 3104 328 62941
Specifications 37PFL7605H
PHILIPS 37PFL7605H
General repair guidelines for TV LCD LED
TV PHILIPS 37PFL7605H / 60, like many other electronic devices, it is advisable to start repairing by inspecting all external and internal elements. Many visible changes in the state of the elements make it possible to determine the further direction of troubleshooting and localization of the defect. Swollen electrolytic or cermet capacitors, charred resistors, ring cracks in the soldered terminals of the elements - all this can significantly help the master to determine the causes and consequences of the malfunction of the TV.
In the absence of any signs of operability, when the PHILIPS 37PFL7605H does not turn on and does not signal anything with the control lights on the panel, there is a possibility of a malfunction of the MJD340 (3) power supply module of the TV. With the same manifestations, the power regulator of the control processor on the motherboard may be faulty. In the absence of swollen filter capacitors of the secondary rectifiers, the diagnostics of the power supply should be started by checking the fuse and, if it breaks, you must first check all the power semiconductor elements of the primary circuit - diodes and transistors VA51 FSQ510 (7), HS01G (8), FAN7621B ( 16), the probability 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 PWM regulator chip PLDD-P973A are subject to verification, which it is desirable to verify by replacement.
If there is no image when you turn on the PHILIPS 37PFL7605H, or it appears for a second and disappears, but there is sound, most likely there is a malfunction in the backlight LED circuit of the LC370EUH (SC) (A2) panel, or in their power converter. It is necessary to check the electrolytic capacitors of the filter of the secondary rectifiers in the general power supply unit.
A malfunction in the backlight circuits often occurs due to an open in the power circuit of the LED lines. It is necessary to disassemble the panel and check the LEDs themselves, the soldering of their conclusions, as well as the reliability of the connections in the connectors and the soldering of the conclusions of the connectors.
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.
Owners and users of the PHILIPS 37PFL7605H 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 37PFL7605H/60 Chassis Q552.1E LA
MainBoard 3104_313_63643 view is shown in the figure below:3104_313_63643
3104_313_63643 can be used in TVs:
PHILIPS 32PFL5405H/60 (Panel LC320WUY (SC)(A1) code 278 p/n: 9322 257 14743), PHILIPS 32PFL6605H/60 (Panel LC320EUH(SC)(A6) code 298 (286 )), PHILIPS 32PFL7605H/60 (Panel LC320EUH (SC)(A6) code 265 ), PHILIPS 32PFL7605H/60 (Panel LC320EUH(SC)(A2) p/n: 932227890682), PHILIPS 32PFL7605H/60 (Panel LC320EUH-SHA2 code 265 p/n: 932227890682), PHILIPS 37PFL5405H/60 (Panel LC370WUY(SC)(A1) code 277), PHILIPS 37PFL7605H/60 (Panel LC370EUH(SC)(A1) p/n: 932227578682), PHILIPS 37PFL7605H/60 (Panel LC370EUH(SC)(A2)), PHILIPS 40PFL7605H/12 (Panel LK400D3LA93 (SRPJ) B p/n: 932227619682), PHILIPS 42PFL5405H/12 (Panel LC420WUY), PHILIPS 42PFL5405H/60 (Panel LC420WUY (SC)(A1) code 276 p/n: 932227573682), PHILIPS 46PFL7605H/60 (Panel 9322 276 21682 code 271), PHILIPS 52PFL8605D/77 (Panel 52 ).
PSU Advanced
According to the conditions of compliance with modern world standards for household switching power supplies, the PLDD-P973A module provides for the use of a Power Factor Correction unit. The PFC circuit is a flyback converter based on the HS01G PWM controller. The reactance of an electrolytic capacitor of a line filter at a frequency of 50-60 Hz is usually not more than 20-30 ohms and its charge directly from the network through open diodes could reach tens of amperes per pulse if no filtering was applied.
As a result of the PFC conversion, an increased voltage on the capacitor (about 380V) cannot directly open the rectifier diodes, on the anode of which the voltage will always be slightly less (about 300V) and then its charging current will always be limited by the elements of the PWM controller. As a result, the envelope of the high-frequency pulses of the consumed current will repeat the shape and phase of the input sinusoidal voltage. The presence of an increased voltage (+ 380V) on the network capacitor indicates the serviceability of the PFC node.
The appearance of the power supply
Main features of the PHILIPS 37PFL7605H device:
Installed matrix (LED-panel) LC370EUH (SC) (A2).
The matrix control uses the Timing Controller (T-CON) 20U65CT.
To power the backlight LEDs, the PLDD-P973A LED driver is used (PSL37, controlled by a PWM controller). An RC2683203 / 01 3139 238 19861 transformer is installed in the LED driver converter. Keys of the CAT4026V type (28) are used as power elements of the LED driver.
The necessary supply voltages for all nodes of the PHILIPS 37PFL7605H TV are generated by the PLDD-P973A power supply module or its analogs using power switches such as VA51 FSQ510 (7), HS01G (8), FAN7621B (16), MJD340 (3).
MainBoard - the main board (motherboard) is a module 3104_313_63643.
Additional technical information about the panel:
Brand: LG Display
Model: LC370EUH-SCA2
Type: a-Si TFT-LCD, Panel
Diagonal size: 37 inch
Resolution: 1920x1080, FHD
Display Mode: S-IPS, Normally Black, Transmissive
Active Area: 819.4x460.9 mm
Surface: Antiglare (Haze 10%), Hard coating (3H)
Brightness: 450 cd / m²
Contrast Ratio: 1400: 1
Display Colors: 1.06B (8-bit + FRC), CIE1931 72%
Response Time: 8/10 (Tr / Td)
Frequency: 120Hz
Lamp Type: WLED Without Driver
Signal Interface: Mini LVDS, 120 pins
Voltage: 12.0V