Troubleshooting Procedures By Ass'y - Samsung KS7D Service Manual

Troubleshooting

6-3 Troubleshooting Procedures by ASS'Y

1. NO Power
Main B+ Check
29" : 123V
(STD-BY : 95V)
STD-BY Mode ?
(Main B+ : 95V)
Main B+ 123V OK?
B/5.0V, B/3.3V Check
ICV201 Problem
2. NO Video
6-4
NO
SMPS BLOCK Check
OK : Main B+connect
OK
Supply Voltage Check
A/5.0V, A/3.3V
NO
Q812A(A/3.3V), Q801(A/5.0V) Input/Out Voltage Check
NO
OK
ICV201 Check
T444S Check
IC501 Check
NO
Q812A(A/3.3V), Q810(A/5.0V) Check
OK
OK ICV201 Pin Voltage Check
(25, 43, 72Pin : 3.3V, 70Pin : 5.0V)
Heater Voltage Check
V999S Heater 6.0~6.3 Vcc
OK
Video B+ Check
(IC501 6PIN)
: 180V~210V
OK
IC301 Check
OK
IC301 Supply Voltage Check
: +16.5V, -16.5V
: IC801S & Diodes
OK
NO
Q401 Check
OK
OK
OK
OK
NO
R418, R516 Check
NO
IC501 Check
OK
ICV201 Check
ICV201 Problem
→ Change
Samsung Electronics