Re: Samsung SyncMaster 204b
That's correct for a 1.8 volt LDO regulator.
The symptoms indicate the processor is shutting down. The power supplies appear to be good. The two possibilities are that a power regulator is shutting down, or a processor is sensing problems. I've been able to identify major parts of the circuit.
The area circled in red in the upper left corner is the main regulator. It is a type known as a bucking regulator, this puts a high stress on the caps. One option would be to replace the three caps (2 ea 100uF 25V, 1 ea 100uF, 16V) inside the circle. I don't have high hopes for that.
The area circled in green is the switch for the LCD panel itself. There is no reason to believe that is causing any problem.
There are two areas circled in umber, one on the left side, one on the far right. By the voltages, these are LDO regulators, and are very unlikely to be responsible.
The area on the left circled in yellow represents a mystery. It is clearly a bucking regulator, but there is no identifiable regulator. I suspect it is the 8 pin IC, but the part number is not identifiable. Again, you could try replacing the caps, but I can't offer much hope that would help.
On the right I have circled some pads in gold. That is the area I would expect to find the cable going to the front panel. Which presents a minor mystery - where is the cable to the front panel?
The chip circled in black is the prime suspect. It is the control processor, and because of the white label, is loaded with a custom program for this monitor. And if it can be positively identified as bad, it is pure 'unobtanium'.
PlainBill
That's correct for a 1.8 volt LDO regulator.
The symptoms indicate the processor is shutting down. The power supplies appear to be good. The two possibilities are that a power regulator is shutting down, or a processor is sensing problems. I've been able to identify major parts of the circuit.
The area circled in red in the upper left corner is the main regulator. It is a type known as a bucking regulator, this puts a high stress on the caps. One option would be to replace the three caps (2 ea 100uF 25V, 1 ea 100uF, 16V) inside the circle. I don't have high hopes for that.
The area circled in green is the switch for the LCD panel itself. There is no reason to believe that is causing any problem.
There are two areas circled in umber, one on the left side, one on the far right. By the voltages, these are LDO regulators, and are very unlikely to be responsible.
The area on the left circled in yellow represents a mystery. It is clearly a bucking regulator, but there is no identifiable regulator. I suspect it is the 8 pin IC, but the part number is not identifiable. Again, you could try replacing the caps, but I can't offer much hope that would help.
On the right I have circled some pads in gold. That is the area I would expect to find the cable going to the front panel. Which presents a minor mystery - where is the cable to the front panel?
The chip circled in black is the prime suspect. It is the control processor, and because of the white label, is loaded with a custom program for this monitor. And if it can be positively identified as bad, it is pure 'unobtanium'.
PlainBill
Attached Files
Not 'pickle fuse', 'Pico fuse'. The name chosen by the manufacturer. 
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