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

Fault Finding of SMPS [Main Power Regulator Board]

Part –2

NO OUTPUT FROM S.B SUPPLY

Check 300V across CP803 [150MFD/450V], FS 803 (2A), IC 801X (VIPER 22A), BZS 803 (MD1), CS 802 (22MFD/50V), DS 802 (UF4007S). DS 803 (UF 4007S), CS 806 (68MFD/63V) PS 804S(WK707), TS 801S, DS 851 (SB500), CS 852 (470MFD/10V), D853 (6V2 – ZENER DIODE).   Check all these components before switch On the set.  Make sure that all are good,  If there is any component stated above suspected, replace them.

S.B SUPPLY VOLTAGE LESS.

ZDTS 851 (KIA431A), PS804S (WK707), RS 866 (6K8), RS 861 (5K6), RS 862 (33K), ICS801X (VIPER22A).

S.B SUPPLY MORE THAN NORMAL.

PS 804S(WK707), ZDTS 851 (KIA431A), RS 860 (6K8), RS 813 (4.7 OHMS), ICS 801X (VIPER22A).

S.B SUPPLY IS OK, BUT OTHER SUPPLIES ARE LOW OR MISSING.

You have to check well all the below stated components on the power board.  If can, Isolate it from the power board, and check it individually, because, on-board check with multimeter won’t get perfect results.

R 852 (3K3), RS 851 (IK), QS 851 (ZG), RS 803 ( I OHM), DS 803 (RF4007), CS 806 (68MFD/63V), PS 801S (WK707), QS801 (C1008), RS 805 (150 OHMS/2W), QS803 (C1008), RS 908 (2.2 K.OHMS), CS 808 (47MFD/50V), ZDS 806 (WP), CM 810 (47MFD/50V), DM 805 (5K.OHMS), CM 813 (10MFD/50V), ICM801S (F9222L), RM 801 (0.22 OHM), PS 803S (WK707), ZDTM851 (KIA431A).

Continued on part-3