Sceptre Monitor X9G-Komodo VII

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Hey there Selldoor,,,,,,,,,,,,,,,,,,,,,,seems like I took more than a couple days off to me . Things sort of "got away from me" and I couldn't get back on the monitor until yesterday. The last thing I'd been advised to try was "checking for cold solder joints". I think selldoor told me to check the joints on the transformer especially close. Well,,,,,I got it fixed and running again. I put my new monitor back in the box, and stored it away in the closet for "future use". I really hate to say this,,,,,but I'm not sure what did it. I suspect a solder joint, but don't know for sure which one because I couldn't tell by just looking. I turned the board over and heated up all of the points with the "larger solder joints" (these were also the larger components on the top side of the board) hooked it back together,,,,,and it works like a new one!! Sorry it took so long for me to get "moving" again! I want to thank retiredcaps, ratdude, ben7, jetadm123, t.j., tom66, and especially selldoor, who wouldn't let me give up on this project!!!! Thanks again to all!!!

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

ok thanks for letting us know.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Selldoor,,,,I'm going to "take a break" on the monitor for a couple days. We had a big storm go through a couple weeks ago and I had two huge trees come down. Have to get them cut up into firewood. Thanks for everything so far,,,,and I'll be back later.

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

Yes, I had read over this post in the beginning, but didn't know what to "make of it". This is from that other post, I wonder, between which points he was checking when he measured the 13 volts? (Power is steady though high [5.5VDC and 13VDC] when the power board is unplugged from the processing board, so I guess that the problem might be coming from that processing board).

No Idea - could have been on the pins.
There is a fuse F1 - you could measure across that if it is the inverter feed may be 13vdc

I also looked at the bottom of the board to see if I could detect any "cold solder joints",,,,,,which I couldn't (they would have a dull, flat look, wouldn't they?) everything looked "shinny" on my board. But maybe you can't tell by looking?

You cant always tell - it crops up often in that thread so re flowing the transformer pins might help

Another post mention the video card connection,,,,where would that be on my board? (Finally find cold solder at 2 pins on quickdiconnection to VGA card, resolder is working final
Thanks for all you help me out)

He may have the other board - we never found out- so I have no idea
what he refers to - check with a magnifier the soldering on the vga connector. Post a close up and I ill have a look tomorrow.

He mentions that the transistors might be shorted,,,can I tell that by checking with my voltmeter and what type of readings should I get?

That test is covered in this guide start at post19
https://www.badcaps.net/forum/showthread.php?t=10419


Busy day tomorrow so off to bed.

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

While its fresh in your mind can you flick through the thread and list the post numbers you mention and I i'll go back and read them
Its ok - skimmed /searched

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

Yes, I had read over this post in the beginning, but didn't know what to "make of it". This is from that other post, I wonder, between which points he was checking when he measured the 13 volts? (Power is steady though high [5.5VDC and 13VDC] when the power board is unplugged from the processing board, so I guess that the problem might be coming from that processing board).

I also looked at the bottom of the board to see if I could detect any "cold solder joints",,,,,,which I couldn't (they would have a dull, flat look, wouldn't they?) everything looked "shinny" on my board. But maybe you can't tell by looking?

Another post mention the video card connection,,,,where would that be on my board? (Finally find cold solder at 2 pins on quickdiconnection to VGA card, resolder is working final
Thanks for all you help me out)

He mentions that the transistors might be shorted,,,can I tell that by checking with my voltmeter and what type of readings should I get?

I don't know much about electronics, but I sure know how to "throw" the questions at you!

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

Not a dumb question at all - I did say it was a puzzle.
Have you read this:
https://www.badcaps.net/forum/showthread.php?t=5218

I am just about to - skimmed it a bit and it seems q6 q7 q11 &q12 may be a problem.
I dont know of the answer is there we shall see.

P.S. I dont know the answer to your question

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

OK,,,,,,,,,,now a dumb question..............I can understand having a "black screen" if it's not getting a video signal from the computer because of a bad video card or video cable,,,,,,,,,,,,,,,,,,(which apparently isn't the problem because everything looks fine when I used a different monitor) But why would the power button be flashing off and on when it seems I have the proper voltage?

[selldoor]

Re: Sceptre Monitor X9G-Komodo VII

Ok - that may be all there are, near enough 5 and 3.3 as on the regulators, the usual 12v probably just feeds direct to the inverter circuit. The other pins may be for signals. Does pin15 change when you press the on off button?
I attach a bit of a guide for removing the Novatek chip

http://www.piclist.com/images/www/ho.../e_cpld2_4.htm

You can but a proper tool but just slowly levering each corner where the grooves are should work

This is a bit of a puzzle it is usually just the vga lead or video card that gives these symptoms. Can you get a vga cable and put isopropyl alcohol on the pins and plug and unplug several times into the socket to try and clean it.
Leave it to dry off then try it again.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

selldoor.........looking at my picture (#1) of the large connector at the right bottom. I numbered the pins from left to right (#1 thru #15). All the pins have wires running to them from the other side of the connector,,,,,,but not all pins show voltage. Number 1 pin thru number 6 pin show no voltage. Pin #7 shows 3.43 volts, #8 - 0 voltage, #9, #10 and #11 all show 5.05 volts. #12 thru #14 show 0 volts and pin #15 showed 0.07 volts.

[Tayninh55]

Re: Sceptre Monitor X9G-Komodo VII

I didn't change anything at the computer,,,,,,,,,,just unplugged the power cord at the monitor, and unplugged the other cable coming from the computer, at the monitor,,,,,,,,,,,,,,,,,,then just re-hooked the cables to the second monitor, and everything works fine with that monitor. just saying????

[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?

[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).

[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.

[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.

[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!

[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?

[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

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

[retiredcaps]

Re: Sceptre Monitor X9G-Komodo VII

The regulators are good.