I have brought a new samsung sync master 794mg monitor before 6 to 9 months now i was suffering an irritating problem... it takes more that 10 seconds for my system to check the monitor post so the pc boot also slows down since there is increase in the amount of time to boot my pc
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Samsung sync master monitors were well known for bad capacitors, if you have a esr capacitor meter you can check in circuit, if not look for dome shape at the top of the capacitor, a dead give away it is open, also check for poor solder connections in the power supply inverter board area.
first of all check weather the width is getting varied from the front panel menu. if there is a vary in width but not full, then need to vary in factory level settings with the help of JIG software provided by Sansung with KIT. The KIT is connected between the CPU and the Monitor.
IF there is no change in width with the front menu, then chage the high voltage PF capacitors at Width section and EHT section(near output transistor (near LOT)).
pin no 1 - Red colour signal (Red colour wire)
pin no 2 - Green colour signal (Green colour wire)
pin no 3 - Blue colour signal (Blue colour wire)
4&5 Not connected
pin no 6&7&8 are (Grounds)RGB Returns
pin 13 Hohizontal sync signal
pin no 14 vertical sync signal
Not nessasry other pins