Friday, January 27, 2012

FAULT FINDING OF SAMSUNG LA26 R71 [ 26” LCD TV ]

Fuse FS801S (6.3A0 blows off frequently
VX801X [INR10D-751], BD 801 [RS605M], DP 801 [UF540], QP801 [FCPH20L60], CP 803 [150MFD-450V], CP 801 [1MFD-630V]
Check these components for short circuit.
FUSE FS803 BLOWS OFF FREQUENTLY
IC 801X [VIPER22A], DS851 [SB 5100], CS 852 [470MFD-10V], ZENER DIODE ZD 853 [6V2-Z].
Check the Zener diode ZD 852 for short.  A common fault.
RM 801 (OE 22), OVERHEATS AND BURNS.
CM 801 [100KPF-630V ], ICM 801 [F9222L]
Short of F9222l short is a common fault.
300VDC ACROSS CP 803 IS MISSING OR LOWER THAN NORMAL
FS801[6.3A], VX801X [INR10D-751], NT 811S [NTC5D-15], BD 801S [RS 605M].  check all these components out from the circuit board.
PICTURE OR RASTER SHAKING HORIZONTALLY [ This is a common fault to most of the LCD TVs]
CP803 [150MFD-400V]  Replace this capacitor.  This is the main smoothing capacitor to rectified main DC voltage.

 Contd.. on part-2