HP 2007W LCD Monitor

[selldoor]

Re: HP 2007W LCD Monitor

One last thing, I have never successfully soldered an SMD component. From my understanding, I'm supposed to put resin on the contact I'm soldering the SMD component too. Then I'm supposed to put a little bit of solder on the iron instead of putting the iron to the component and the board. Is this correct? And does anyone have any good advice that could help me with replacing SMD components including desoldering and soldering them? Thanks for all the help guys!

Pleased the burnout wasnt as bad as you thought. Have we decided what value the fuse is before it is destroyed - does it have a letter on it N K ??

Re SMD Soldering there are a number of videos on youtube

Desoldering
http://www.youtube.com/watch?v=6XyrNjNXSo8
http://www.youtube.com/watch?v=ZJcvX8VXtos
Soldering
http://www.youtube.com/watch?v=EWeAOemTY_E

They make it look easy _ practice is the answer.

[retiredcaps]

Re: HP 2007W LCD Monitor

One last thing, I have never successfully soldered an SMD component.

Neither have I. There are videos like this one

http://www.youtube.com/watch?v=3NN7UGWYmBY

You can, however, and I have seen people here do it just install a picofuse on top of the existing fuse. Since the SMD fuse is open installing one "over top" is fine.

http://www.ebay.com/itm/180599519251

[retiredcaps]

Re: HP 2007W LCD Monitor

You are basically jumping the open fuse with the Meter (set to DC AMP mode, the Red probe on the meter will also have to plugged inot the AMP probe inlet if the meter has separate V/Ohm and AMP input, the meter will show how much current the T-CON board is flowing, or you can use 1 Ohm instead of using the AMp meter.

Multimeter tutorial (less than 5 minutes). It covers how to measure amps.

http://www.youtube.com/watch?v=bF3OyQ3HwfU

[Spork Schivago]

Re: HP 2007W LCD Monitor

Okay. That makes sense. I did have the probe plugged into the 20A input. I know where to put the red probe, right after the fuse, right? Where should I put the black (common) probe? On a ground some where or close to where the red probe goes? Here's two pictures of my multimeter. It's an old Craftsman 82357 but it still works fine.

[budm]

Re: HP 2007W LCD Monitor

Red probe on one end of the fuse, black probe on another end of the fuse, DO NOT LET THE PROBE TOUCH THE CHASSIS, or you will blow the fuse for current measurement section of the meter. You will have to at the screen while doing this to see if you will get the image on the screen. See what the current reading is also on the meter, make sure to put it into DC AMP mode.

[Spork Schivago]

Re: HP 2007W LCD Monitor

Multimeter tutorial (less than 5 minutes). It covers how to measure amps.

http://www.youtube.com/watch?v=bF3OyQ3HwfU

Wow, that was cool. I knew about all the other functions, however, the AMP stuff I didn't know about. I have been using it to test batteries but nothing else. I tried unsuccessfully to measure it. I set it to 20A, put the common before the fuse and the red probe after the fuse. Turned on the monitor while it was hooked to a PC and couldn't get a measurement at all.

Is it possible that I damaged something from shorting it out last night to the point where the T-CON board isn't getting what it needs? I measure the voltage coming into the logic board and it all seems to check out. 5V is 5V, VCC is 5V, etc.

Sorry for posting questions about how to do this after you write a message like the one with the link. I start writing my question before you write the message and by the time I ask it, it seems you have sent me something that answers my question.

[Spork Schivago]

Re: HP 2007W LCD Monitor

Okay, so I measured those voltage regulators to see if they where getting anything. I don't think they're the problem. The measurements are for the first pin (closest to VGA port) 3.3vdc, the middle pin 1.8vdc and the last pin was really low, 1.x m. The second voltage regulator (the big one), the first pin registered 5.24vdc, the middle one 3.3vdc and the last one was like the third pin on the first regulator. Is this right?

[budm]

Re: HP 2007W LCD Monitor

OK, the T-CON is getting 5vdc feeding it, and we bypass the fuse using an AMP meter, and the meter did not show anything, I expect at least 1/2A. At this point youihave dead T-CON board with blown fuse, so what ever shorted out and took out the fuse with it, it is no longer work. Not worth getting new LCD panel, unless any one els here has better suggestion. You backlights are fine, its job is to provide light source and that is, nothing else.

[Spork Schivago]

Re: HP 2007W LCD Monitor

Damn, that sucks. Was really hoping I could fix this. No chance that the capacitor I was talking about has anything to do with this, huh?

I might of made a mistake here. I just noticed that it's going into stand by as soon as I turn it on. I'm going to try reboot the PC I have it hooked up to. Maybe that'll fix it. I'll let you know what I find out.

[Spork Schivago]

Re: HP 2007W LCD Monitor

So rebooting fixed that problem. It has to be something with the logic board. There's test points before the ribbon cable that goes to the T-CON board and all of those test points are reading 0vdc.

[Spork Schivago]

Re: HP 2007W LCD Monitor

Never mind that previous post, I had the DMM on the 20A. I had the probes in the V spot so I didn't do any damage. Most of the points are reading some where between 1.5 volts.

[Spork Schivago]

Re: HP 2007W LCD Monitor

I have to be doing something wrong here. When the monitor is on, the fuse registers 0 resistance and -5vdc. When it's off, it shows OL.

[budm]

Re: HP 2007W LCD Monitor

It is because the Ohm meter circuits of the meter is being fed with the 5vdc form the logic board cause the meter to show some number on the meter, I would not do that for too long, it may damage the input circuits of the meter. The board has blown fuse, something caused it to blow.

[Spork Schivago]

Re: HP 2007W LCD Monitor

Okay, I have some broken LCD screens from old laptops I fixed. I'm going to take the fuse off of one of them and try it. The board is made by the same manufacturer but it is a smaller screen. Worse case is it'd blow I guess. Wish me luck.

[Spork Schivago]

Re: HP 2007W LCD Monitor

I replaced the fuse. Like we thought, there was still no picture. I did get a reading with the DMM set to Amps. Nothing for the 20A setting but on mA's, I get 330mA give or take a few.

[budm]

Re: HP 2007W LCD Monitor

This 5Vdc may be feeding another regulator on the T-CON board, from your picture, I can see U1 3.3V Regulator, there may be more on the board. So check and see if you do have 3.3v at the output pin (center pin) of U1.
Another possibility is that, what ever shorted out may have blown itself open circuits.

[Spork Schivago]

Re: HP 2007W LCD Monitor

This 5Vdc may be feeding another regulator on the T-CON board, from your picture, I can see U1 3.3V Regulator, there may be more on the board. So check and see if you do have 3.3v at the output pin (center pin) of U1.
Another possibility is that, what ever shorted out may have blown itself open circuits.

In your picture, the one labeled 3.3VDC Output is reading .25VDC (25mVDC), the middle pin on the other side is reading the same, .25VDC (25mVDC). The one pin that says 5VDC Input is reading 0. Because there's no input but there's a small reading on the other pins, is it because of the surrounding circuitry feeding back into the regulator?

[Spork Schivago]

Re: HP 2007W LCD Monitor

The reason I'm getting nothing on the regulator is because the fuse blew again. On the logic board there's test points below the connector. I measured them and they range any where between .77VDC and 1.5VDC. I can't find a pin-out for the Genesis chip but I don't think the voltages are correct. I'm gonna start checking the components on the logic board I guess. If I can track it down the problem, it should prevent the fuse from blowing. If anyone can give me a good starting point, I'd appreciate it.

[budm]

Re: HP 2007W LCD Monitor

The 5VDC is from switched transistor on the Logic board where you plug in the DVI/VGA cable into, so right now you read real low voltage on either side of the fuse?
If that is the case, the switched transistor may be damaged.

[budm]

Re: HP 2007W LCD Monitor

Please look at the PDF attached on the reply #8 to see if you have voltage or not.
"Logic bd redlined BM.pdf "