Re: Dell UltraSharp 2000FP Bad Inverter Board - Bad DT Transistors?
Sorry, I don't know. I sold it. That's the problem with this business. Once it works, it leaves my shop. I hadn't heard of any complaints though, so no news is good news!
maverick530
Senior Member
Last Activity: 07-03-2010, 09:37 PM
Joined: 12-19-2008
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Re: 500W ATX PSU that won't power on at all
Here's a pic of the top side....Leave a comment:
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Re: 500W ATX PSU that won't power on at all
It is an ULTRA XU-ULT500P, sorry I don't have pics of the top-side yet.Leave a comment:
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500W ATX PSU that won't power on at all
I have a 500W modular ATX power supply that all of a sudden one day did not turn on.
When I ripped it open since I saw some bulging caps, I also noticed this burn mark on the underside of the board.
It looks like a fried CR211 chip with a 152 on the chip itself. Does anyone know what this chip is and whether or not I need to buy a new one?
This is my first PSU fix, but I've been fixing LCDs for the past year. I'd love to save this PSU from the dumpster since it's a nice modular one. Any help would be greatly appreciated. Thanks!... -
Re: HP w2007 PTB-1773 - Where to start?
First time I tried to open this monitor it took me 2 hours, for the very same reason. So to save you some time, I'll tell you how to do it:
Once the base is unscrewed and all visible screws from the back are removed, start with the monitor facing you-- so you're looking right at the screen. Then pry away the the backing (it snaps off). Start with the top left corner, so you don't have to mess with the power button or the controls on the bottom right. Don't be afraid to use a bit of force, that was my problem,...Leave a comment:
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Re: Another bad HP 1955 Inverter... probably
Correct, PF701 is a 5A pico fuse. I've fixed about 10 of these boards already with this one:
[URL=http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=F2317-ND&x=13&y=2]F2317-ND[/URL]
Best of luck!Re: Another bad HP 1955 Inverter... probably
Correct, PF701 is a 5A pico fuse. I've fixed about 10 of these boards already with this one:
[URL=http://search.digikey.com/scripts/DkSearch/dksus.dll?lang=en&site=US&WT.z_homepage_link=hp_go_button&KeyWords=F2317-ND&x=13&y=2]F2317-ND[/URL]Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok, I resoldered CVcc (C807) and it looks better, and also one of the legs of the IC that looked like it needed more solder, but it hasn't changed anything. I still get oscillation on pin 1 from 9.4v to 10.5v.
At what point should I desolder the joint between the power side of the board and the inverter side again? Is that worth trying again?
I'm at a loss as to what else to try. If anybody is willing to look at it, I'll send it to them free of charge.Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Your requirement of placing the board under "load" to test it is intriguing to me and I want to learn. What is the advantage of doing so? Is it bad if I don't? Because I didn't place the board under load when I first tested it after I soldered in the new IC--and it registered good/working, but then failed when I put it all together. Did this action cause something to fail?Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Please bear with me as you lost me completely on testing with a load. I have no idea how to place a resistor across a 5 volt output. How is this done? What kind of resistor do you recommend? Can you link me to one I can purchase? Also, which 5V output should I place it across? And define 'across': where do I place the negative end?
Which Capacitor is Cvcc? C807 (82uF 50v) or C829 (1uF 50v)? How can I tell? My guess is it's C807, as it is most closely aligns position-wise on the PCB with pins 1 & 2 of the...Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok I checked the bridge rectifier. Let me know if this is wrong, but to check it, I checked pins + with one of the center pins, then reversed the probes. It read about .6 (on Diode test) in one direction, then infinity (1) in the other. Tested with the other center pin, and it was the same. Tested pins - with one of the center pins, and then the other, all with the same result. I believe this means it checks out, unless I didn't do it right.
Nevertheless, I resoldered the 4 leads on the Bridge Rectifier by completely removing...Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
BTW the solder joint mentioned in the picture does look weird. I resoldered a capacitor there, and probably didn't do the best job, but looking at it closely--it looks to me like a solid solder, it's just a little ugly, like I got the PCB too hot with too little flux.
Can you please point me to the Bridge Rectifier? I'm not sure what part/where that is.
Remember how I thought the reading on the IC (I801) was: 'CA1530A'? Well upon looking at the replacement TEA1530AT-- these replacements actually have 'EA1530A'...Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok, I got the new TEA1530AT part in and replaced it (See pic). I think I did a great job soldering it in. It looks clean for such a tiny part. I plugged it in and did an initial test, and got 11v solid across pins 1 (VCC) & 2 (GND)! Between pins 8 (Drain) & 2 (GND) showed a nice solid 160v, so I was ecstatic. Also checked some of the output voltages, and saw some at 5v!
So I plugged in the power board to the monitor, and the power light to the monitor flashes for a quick millisecond (should stay on) and no joy.
...Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok, I will order the TEA1530AT; Anybody know where I can purchase this or do I have to do the month-long HKin.com process (too expensive to pay for tracked 3 day shipping)?Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
How do you know what polarity to test Resistors? I've marked up the diagram with both values (if different).
Not sure how to read what R814's value should be. It's markings are (from left to right): Gold Black Orange Orange. It reads 21.8 ohms in either direction.
R803 reads .6 ohms (rated for .51 ohms)
R805 reads 100.6K ohms (rated for 100k ohms)
R811 reads .5 ohms (rated for .27 ohms)
R814 reads 21.8 ohms (rated for ??)
See anything wrong with these values?...Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok, I checked the Semiconductors. I've labeled the values and polarities on the attached diagram.
The only one that seems odd is D806, that reads .080 in both directions!
Q803 looks ok, even though I don't get any reading in any direction from G to D.
Will check the resistors shortly....Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Does this mean IC801 is bad? Should I go ahead and order one? If so, I'll get the order in immediately as HKin takes weeks.Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Voltages from pin 2 (negative black) to pin:
1 - -15.7mV
3 - -.1mV
4 - 0
5 - 0
6 - .051v
7 - .007v
8 - 159.5v
So I do get the 160v between 2 & 8 you expected, but no real signs of voltage fluctuation. The only fluctuation I saw was a steadily increasing voltage on pins 6 & 7 probably due to my "Auto" sensing scale DMM. When I set it to V (not auto scale) it gave those solid readings above.Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
Ok,
I probed the board via continuity test, and found that:
A maps to pin 6
B maps to C (otherwise couldn't find pin mappings for these B or C)
D maps to pin 2
Is there any other test I can do to better map B and C or is this enough to go off of? What does this tell us?
BTW, here's a [URL=http://www.multimeterwarehouse.com/my69.htm]link to my new MY-69 DMM![/URL] ! So far, it's been great!Re: HP w2007 PTB-1773 - Where to start?
Ok,
I probedLeave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
I got a 10x Loupe and my close up lense and I'm fairly certain about the top right number being 1530A (see pic), which is the most important, right?
My best deciphering says IC801 is:
CA1530A
6S1DZ02
HnG7311
Line 1 didn't change. Line 2 changed most with more confidence. The first character on the 3rd line is a bit fuzzy, it could even read WnG7311....Leave a comment:
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Re: HP w2007 PTB-1773 - Where to start?
The bands on R804 (from left to right) are Gold?, Orange, Green and Brown.Leave a comment:
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