Technical description and composition of the PHILIPS 26PF7321 TV, type of panel and applicable modules. The composition of the modules.PHILIPS
Model: 26PF7321 / 12
Chassis / Version: LC4.31E AA
Panel: LC260WX2-SL04 // LC260WX2 (SL) (B2)
T-CON: TL22710D
Inverter (backlight): TE26B-M (A) REV03_6632L-0290D_LC260WX2, TE26B-3 (A) PEV03_6632L-0291D_LC260WX2
PWM Inverter: OZ9981GN, BD9766FV, 10393, 10358
MOSFET Inverter: RSS100_N03 (SO8)
Trans Inverter: KDH-PT264Db68
Power Supply (PSU): PLCD170P2
PWM Power: NCP1207A (8pin PWM), DLA001D (PWM = L6598), L6562D (PFC)
MOSFET Power: 3N80C, P20NM60FP
MainBoard: 3139-123-6117.2 WK542.2
IC MainBoard: 73CD9XM, M56V16160J-7, LD1086-1.8, PACIFIC3-N3_T9TF4AFG-0003, gm1501-LF-M4747CF_0710S, M29W400DT, TDA15021H / N1C91, TDA8931T
Tuner: UL1318S / AI H-3_3139147 19801A
Specifications 26PF7321
PHILIPS 26PF7321
General recommendations for repairing TV LCD
Repair of all electronic devices, including the PHILIPS 26PF7321 / 12 TV, it is advisable to start with an external examination of its external and internal elements. You should also pay attention to the condition of the case elements, connectors, cords, loops and buttons. In some cases, visible external damage to the elements can suggest directions for troubleshooting and localizing the defect before starting the necessary measurements at the control points of the nodes of electronic circuits. If ring cracks are detected in the soldering of the 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
Sometimes the PHILIPS 26PF7321 / 12 TV simply 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 B / PEC common power module DV0-3_E177671 (S) _94V-0, CM-1_REV: S4F. First of all, it is necessary to replace the swollen capacitors of the rectifier filters, if any. If the mains fuse is broken in the power supply, in most cases a breakdown of the power switch 3N80C, P20NM60FP, 91QK646, 1207A (SO8), L6562D, which can be integrated with a PWM controller, or a separate field-effect transistor is detected. The rectifier bridge diodes and the electrolytic capacitor of the mains rectifier filter should also be checked.
It should be borne in mind that in the repair practice it is extremely rare that key transistors of the N-FET type fail for no reason that should be looked for by checking other components, for example, a breakdown of the key can provoke faulty elements of the damper circuits, either dried electrolytic capacitors or dangling resistors of the primary circuit of the PSU, involved in the stabilization process. In this case, all the semiconductor elements of the strapping of the P11NM60FDFP PWM controller microcircuit are subject to verification, which it is desirable to verify by replacement.
Diagnostics of power modules with a Power Factor Corrector (CMC) is somewhat more complicated and requires a more detailed approach.
Inverter Repair
If the PHILIPS 26PF7321 / 12 does not have an image, but there is sound, there is a possibility of a malfunction of the backlight or power converter. You should also make sure that the electrolytic capacitors of the secondary rectifiers of the common power supply are working.
In most cases, the diagnosis and repair of the inverter TE26B-M (A) REV03_6632L-0290D_LC260WX2, TE26B-3 (A) PEV03_6632L-0291D_LC260WX2 is difficult due to the organization of protection, which turns it off in emergency cases to avoid fires during short circuits or open circuits and open circuits during depressurization of lamps. Often, repairmen block the protection circuits in order to make the necessary measurements at the control points of the inverter to identify the causes of the defect.
In such cases, special care should be taken during diagnostics, and after completion of all repair work, it is necessary to restore the circuit and the inverter protection for further safe operation of the TV.
Repair Main Board
When trying to repair the motherboard, you should first check the serviceability of linear stabilizers or power converters of microcircuits and, if necessary, update the software (software). In some cases, to repair the MB board (SSB), it may be necessary to replace the chips - 73CD9XM, M56V16160J-7, LD1086-1,8, PACIFIC3-N3_T9TF4AFG-0003, gm1501-LF-M4747CF_0710S, M29W400DT, TDA15021H / N31Т91, serviceable.
It should be remembered! Attempts to repair the PHILIPS 26PF7321 / 12 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 26PF7321/12 Chassis LC4.31E AA
MODELS: 26PF5321/10/12, 32PF5321/10/12, 37PF5321/10/12, 26PF7321/12, 32PF7321/12, 37PF7321/10/12, 42PF5421/10
The appearance of MainBoard 3139-123-6117.2 is shown in the figure below:3139-123-6117.2
3139-123-6117.2 can be used in televisions:
PHILIPS 26PF4311S/10 (Panel LC260WX2(SL)(B2)), PHILIPS 26PF5521 (Panel PLCD170P2), PHILIPS 26PF7321/12 (Panel LC260WX2-SL04), PHILIPS 32PF4311S/10 (Panel LC320W01 (sl)(06)), PHILIPS 32PF4311S/10 (Panel LC320W01(SL)(06)), PHILIPS 32PF5331/12 (Panel T315XW01 V9), PHILIPS 32PF7321 (Panel LC320W01), PHILIPS 32PF7331/12 (Panel LC320W01), PHILIPS 32PFL3321S/60 (Panel LC320W01 (SL)(06)), PHILIPS 37PFL3321/10 (Panel LC370WX1-SL04), PHILIPS 32PF3321/12 (Panel CLAA320WB02 (P)), PHILIPS 37PF3321/12 (Panel LC370WX1 (SL)(04)).
PSU Advanced
The model 26PF7321 / 12 uses the PLCD170P2 power supply unit using the PFC (Power Factor Correction) node - an active filter of the highest harmonics of the current consumption. In fact, it is a boost converter based on the L6562D 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 26PF7321 device:
Installed matrix (LCD panel) LC260WX2-SL04 or LC260WX2 (SL) (B2).
The matrix control uses the Timing Controller (T-CON) TL22710D.
The TE26B-M (A) inverter is used to power the backlight, it is controlled by the OZ9981GN, BD9766FV, 10393, 10358. PWM controller. The KDH-PT264Db68 transformer is installed in the inverter converter. As power elements of the inverter, keys of the type RSS100_N03 (SO8) are used.
The necessary supply voltages for all nodes of the PHILIPS 26PF7321 TV are generated by the PLCD170P2 power module or its analogs using NCP1207A (8pin PWM), DLA001D (PWM = L6598), L6562D (PFC) microcircuits and 3N80C, P20NM60FP power switches.
MainBoard - the main board (motherboard) is a module 3139-123-6117.2, using microcircuits 73CD9XM, M56V16160J-7, LD1086-1,8, PACIFIC3-N3_T9TF4AFG-0003, gm1501-LF-M4747CF_0710S, M29W4005091, T29 TDA8931T and others.
The tuner UL1318S / AI H-3_3139147 19801A provides the reception of television programs and tuning to channels.
