Sceptre Monitor X9G-Komodo VII

[Tayninh55]

I have a blinking power light (w/black screen) problem. I was using my computer at the time that this happened, and the monitor went black, the same as if I was shutting the computer down. The screen went black, a white rectangular appeared with the words "No Video", then went completely black again. The only difference between this, and a regular shut down, was that the blue power light was flashing. When I turn the power button off,,,,,and then back on,,,,it goes through the same process, black screen to "no video" message, and then back to black screen with flashing power light. I'm not a repairman, but with the help (and patience) of PlainBill and others, I did manage to repair two LCD TV's in the past. The first thing I did was separate the case and look at the caps, they all look "visually" good, and are "the elite" caps. I already read the posts on "blinking power light" (and read how "elite" PlainBill thinks elite caps are) and "two seconds to black", but not sure where my problem lies. I haven't yet looked at the bottom of the boards nor taken any pictures,,,,,,,that will be my next step. I'm just writing this as a warning to PlainBill that "I'm back" and hoping that you guys can "work your magic again. I'm going to take pics and look at the bottom of the boards tomorrow,,,,,,,in the meantime,,,,,,I'm ALL EARS if you have any suggestions..................I'll try to follow your instructions! Thanks again!
Don

[retiredcaps]

Re: HELP - Sceptre Monitor X9G-Komodo VII

1) Post clear focused top down pictures of all your boards following my sig file below exactly. We want the picture compositions like so

https://www.badcaps.net/forum/showpo...94&postcount=1

2) Do you have a multimeter and know how to measure DC voltage?

PS. PlainBill has been MIA since April 2012.

[Tayninh55]

Re: HELP - Sceptre Monitor X9G-Komodo VII

Sorry to hear that about PlainBill,,,,,,,,,,I hope nothing has happened to him!

[Tayninh55]

Re: HELP - Sceptre Monitor X9G-Komodo VII

Yes, I have a meter and know how to read DC voltage,,,as long as I know where point A, and point B are located to do the test, but again, I'm far from a professional. I am attempting to post the front and back of my LM004 board and a pic of the front of the other board (I haven't taken this one loose from the chassis yet). I you do need the back of this one, I'll get a pic of it also. From appearance, I can't see anything that is wrong. the two 470uf caps look normal, as do the 1200uf caps. As a start, do you think I should replace these four caps with new ones, regardless of how they look, as some have recommended? Haven't done anything to the boards yet, waiting for your suggestions. Hope the pics are ok!
Don

[selldoor]

Re: HELP - Sceptre Monitor X9G-Komodo VII

Im having an early night so will leave retiredcaps to start you off. I only wanted to say thanks for the really good pictures - there have been some dire ones on here recently.
Cant see any fuses on the video board - have you checked your PC video card is ouputting correctly and perhaps tried a new cable - pc to monitor.

[retiredcaps]

Re: HELP - Sceptre Monitor X9G-Komodo VII

One the main board, there are two voltage regulators: U1 and U2.

1) Set your multimeter (if manual range) to 20V DC.

2) Put your black probe on a ground screw. Leave it there the entire time. This is your ground.

3) Put your red probe on each of the pins, but ignore the "fat" tab. The fat tab is "up" or "north". Number the pins left to right.

4) You should have 3 readings per regulator.

5) Report them like so along with the part number (include all lines on the IC) of the IC.

U1
AS1117-33
pin 1 = 0.0
pin 2 = 3.3
pin 3 = 5.0

Also try reseating and cleaning every internal cable.

[ratdude747]

Re: HELP - Sceptre Monitor X9G-Komodo VII

Moved from General Computer Discussion. Also revised title to remove clutter.

[ben7]

Re: Sceptre Monitor X9G-Komodo VII

Have you tried hooking it up to another video source?

If the problem still persists, Im guessing that there is an issue with the main processing chip, which appears to be connected to the VGA port directly.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Selldoor, Thanks, but I have another monitor hooked up to my computer at the present time and it is working fine, so that eliminates the computer and video card (I think).

[jetadm123]

Re: Sceptre Monitor X9G-Komodo VII

In your third photo of your logic board, there are 2 Novatek chips on it. The one of interest is the Novatek controller that's in the brown socket with a paper label over it. Carefully, pull the label back to expose the part number. Is the part number NT68521?

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Ok, I have your voltages Retired: U1 Part #ATC 3HD
17-33
Pin #1 = 0.0
Pin #2 = 3.34
Pin #3 = 5.05

U2 Part #4CD
17-25 It also has a "Large capital C", with
a "smaller capital AC" inside the
the Large C, in the upper left side.
Pin #1 = 0.0
Pin #2 = 2.52
Pin #3 = 4.76

Jet,,,,,,,No. The numbers on the NOVATEK chip are: NT68F633L
0445-CO
MJR9A

[retiredcaps]

Re: Sceptre Monitor X9G-Komodo VII

The regulators are good.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

OK,,,,,,,,,,Does that mean that my "power supply" is working they way it should?

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

Not necessarily, can you post pictures of any connectors if possible showing the legend - 12v, 5v. gnd. pwr. and so on.
Can you also update your profile with country and mains voltage.

Also Im not certain but think the chip jetadmin refers to will lift out of the socket. If it does clean the contacts carefully with isopropyl alcohol
and re insert.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Sell,,,,,,,,,I updated the profile,,,,,looked at that chip (and it does look like it might just pull out of the socket), but I haven't tried to pull it yet. I don't quite understand what you are asking about the connectors..........I can take closer pictures of where the various "cables" plug into the boards (is this what you mean). When I looked at the plug-ins,,,I didn't see any notations (or legend) of voltages, grounds, etc. written on the board or by the various pins of the plug-ins, unless I was overlooking something. Is this what you were asking?

[t.j.]

Re: Sceptre Monitor X9G-Komodo VII

When I looked at the plug-ins,,,I didn't see any notations (or legend) of voltages, grounds, etc. written on the board or by the various pins of the plug-ins, unless I was overlooking something. Is this what you were asking?

yup spots ya can test!

picture 1 bottom right corner of pic, there is a connector ! take a good picture of it!

[tom66]

Re: Sceptre Monitor X9G-Komodo VII

I wouldn't entirely rule out your video card, have you tried swapping monitors around? It sure sounds like a video card failure.

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

No dont bother with pics if there is no indication of what the pins are.
Did you unplug clean and replug ALL cables as retired caps suggested earlier.

Next connect it all up and plug in with your meter on 200vDC put the black pin on an ground point - there is one just at the end of the long connector - it shows clearly on the back of the board then with the red probe test the voltage at each pin. If they all read less than 20vdc put you meter on 20vdc
and do it again for a more accurate result.

Whilst these are low voltages take care not to touch any of the "Hot" Parts

Work on a non conductive surface and keep boards apart with sheets of card
if thre is any chance of them touching.

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

@Tom66 did you see this? Looked to me as though we were ok on video card and lead? unless you have another view on it.

Selldoor, Thanks, but I have another monitor hooked up to my computer at the present time and it is working fine, so that eliminates the computer and video card (I think).

[tom66]

Re: Sceptre Monitor X9G-Komodo VII

@Tom66 did you see this? Looked to me as though we were ok on video card and lead? unless you have another view on it.

I thought that - but what if just one output on the video card has failed, and the other is okay?