Checkpoints By Error Mode - Samsung HT-Z410 Service Manual

Troubleshooting
4-1 Checkpoints by Error Mode
4-1-1 Power Failure
The power does not turn on.
UIC1 Main PCB;
pin 14, 40, 55 and 89 of 5V?
Yes
Check for
POWER-SENSE (5V) at Main PCB
; pin 95 of UIC1
Yes
When POWER ON
for Front PCB, Check for HIGH
voltage (5V) at ZIC; pin16
Yes
A
4-2
No
POWER PCB (SMPS)
CN2(6) CHECK → 5V?
Replace CON3 wire
Check NORMAL
No
VOLTAGE at SMPS PCB
; D51
Check pattern from CON3
to pin 95 of UIC1
No
Replace the VFD DRIVER IC
(ZIC1).
No
Yes
Check for circuit at SMPS
PCB; ICM01, Fuse (F1), D81
No
Yes
Check Resistance from GND
to pin 85 of MICOM (UIC1).
If short (0 ohm), Replace
MICOM (UIC1)
Replace D51.
Samsung Electronics