Samsung SyncMaster LD220HD HDTV/Monitor - no power on

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

OK, thanks.

I'd better start reading up...

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Test results...

[still with F301 still disconnected]

IC5003
ƆII -> line 1 of the IC [A backward C and 2 vertical lines]
1117 -> line 2 of the IC
0945FG -> line 3 of the IC
pin 1. = 0.001
pin 2. = 0.001
pin 3. = 0.001

IC1009
ƆII -> line 1 of the IC
17-33 -> line 2 of the IC
0944DG -> line 3 of the IC
pin 1. = 0.001
pin 2. = 1.2 to 2.0
pin 3. = 1.8 to 3.3

IC1001
78 M0 9A -> line 1 of the IC
KW 9A -> line 2 of the IC [the W might be V]
pin 1. = 0.001
pin 2. = 0.001
pin 3. = 0.001

Back side...

IC2004
ƆII -> line 1 of the IC
1117 -> line 2 of the IC
0942FG -> line 3 of the IC
pin 1. = 0.000
pin 2. = 0.000
pin 3. = 0.001

[tom66]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

When you say "1.2 to 2.0" and "1.8 to 3.3" do you mean the readings are jumping?

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Yes, they fluctuate quite quickly.

[tom66]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Well, that is a problem. Are you sure the suffix is -33? If so, need to trace where that fluctuating 1.8~3.3V is coming from.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Yes, it's 17-33.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Does that mean it's toast?

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Any suggestions?

[tom66]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

I would consider replacing that regulator, but if that fails, you would probably need a schematic to trace the circuit and figure out what might cause this fault.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Google doesn't bring up much relating to voltage regulators marked 17-33 0944DG. Does the 0944DG just relate to the assembly date etc?

Any suggestions for a suitable replacement? Otherwise, will any 1117 3.3v regulator be OK?

I've not found a schematic for the board so far, either.

[tom66]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

It's a short code for a 1117-3.3V type. Package format is SOT223.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

OK, thanks.

I've just been looking on ebay, and it looks more like TO-252, which is a square format, rather than rectangular.

Like this one.

[budm]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

See post 7 for link to Digikey:
https://www.badcaps.net/forum/showth...999#post300999

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

OK, NCP1117ST33T3G, that's SOT-233... so do they comes in both square and rectangular formats?

I'm not sure whether the rectangular one would fit.

[selldoor]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Unles the ebay link you gave is misleading that NCP1117ST33T3G has to be wrong it has 3 legs plus tab

Digikey have this one LD1117DT33TR

If you are near any of the outlets, rs online have dpak 1117 3.3v - may be worth checking them out

Depending on whether you can collect or delivery charges you could get one of these from
cpc see here : http://cpc.farnell.com/texas-instrum...k-3/dp/SC10562
they had a cheaper one but is out of stock but I think they have free delivery and no handling charge even for small
orders so even a more expensive one may work out cheaper overall. Check the physical size before you order.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

OK, thanks.

I'll check out the LD1117DT33TR.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Depending on whether you can collect or delivery charges you could get one of these from
cpc see here : http://cpc.farnell.com/texas-instrum...k-3/dp/SC10562
they had a cheaper one but is out of stock but I think they have free delivery and no handling charge even for small
orders so even a more expensive one may work out cheaper overall. Check the physical size before you order.

I've ordered that one from cpc.farnell.

78p, free delivery.

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

It was a real pain to get the old one off.

Is it just the 2 pins that need resoldering onto the board?

[selldoor]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

Usually its the Two outer pins and the Tab - was the tab soldered on the old one?

[oddbodd]

Re: Samsung SyncMaster LD220HD HDTV/Monitor - no power on

I think so. It was stuck fast to the board, and when I finally got some movement, I had to lever it off of the tab side.

I'll add a dab of solder to the tab.