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.
Fault Finding of SMPS [Main Power Regulator Board]
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).
Fault Finding of SMPS [Main Power Regulator Board]
12 VOLT AND 13 VOLT POWER SUPPLY OUTPUTS ARE MISSING
DM853 [FCH 10A10], CM 856 [1500 MFD/25V]..
12 VOLT POWER SUPPLY OUTPUT IS MISSING.
FM 851 [KRG030], ICM 853 [KIA 278R12P1], RM 858 [10K OHMS], CM 858 [470 MFD/25V].
5 VOLT POWER SUPPLY OUTPUT IS MISSING.
ICM 852 [MC 33167T], DM 854 [EN 220A], CM 861 [2200 MFD/10V], DZM 853 [5V6-Z ZENER DIODE SHORT], DZM 852 [WP], QM 851 [ZG].
24 VOLT POWER SUPPLY OUTPUT IS MISSING.
DM 851 [EN 220A], CM 851 [1500 MFD/35V], DZM 853 [5V6-Z ZENER DIODE SHORT], DZM 852 [WP], CM 852 [1500 MFD/35V].
ALL OUTPUT POWER SUPPLY VOLTAGES ARE LESS THAN NORMAL, AND S.B POWER SUPPLY OTPUT IS OK.
PS
803S [WK 707], ZDTM 851 [KIA431A], ZDM 803 [5V1-Z ZENER DIODE], QM 802
[ZHOG], QM 803 [ZHOG], QM 803 [ZHOG], DM 803 [0E2 OHMS/2W], ICM 801S
[F9222L].
ALL POWER SUPPLY VOLTAGES ARE EXCESS THAN NOMRAL, AND S.B POWER SUPPLY OUTPUT IS OK.