Re: 7900GS card with bad polymer caps?
Not to discourage you too badly, but dots/lines are an indication of memory failure, at least when I've had it happen to me in the past. This happened to my Orchid Righteous 3D card when it was placed in a Cyrix PR200+ machine. Those machines overclocked the PCI bus to 43 MHz, frying the memory and possibly the chipset.
Before that I had a Diamond S3 ViRGE (3D decelerator) that had the memory upgrade put in (2MB to 4MB) - one of the 1MB chips was bad, and as luck would have it, the PC vendor was out of business...
PincushionMan
Member
Last Activity: 12-04-2023, 02:53 PM
Joined: 12-08-2009
Location:
-
Re: Blown (FZ78 1500 6.3v) on XFX 8600 GT. What to buy?
Yup. Got bit by this, too. So the lifetime might as well be 30 days. Go figure.
Looking to buy some caps on this one, any recommendations?...Leave a comment:
-
Re: Optiquest Q9 no power
Some tips don't tin very easily, and it may be time to replace yours, since you stated it was used. I've seen good tips average about $10.
I primarily use wicking - all the pumps I've ever used were continuously clogging and rather a bother to work with.
As for the wattage, 30W may be enough for GP soldering, but I'd recommend a 65W or better from a known reputable brand for desoldering, especially from circuit boards. I didn't catch your type of solder, I think 63/27 is preferred (63 Pb/27 Antimony?).
...Leave a comment:
-
Re: How to power up LG 23" L2320AL without media center console?
Hey, man, that's appears to be just a straight DVI connector. Hmm - I've heard that some Apple displays with the ADC (Apple Display Connector) had to have a special adapter from Dr Bott (the DVIator) that allowed the ADC Monitors to work with standard PCs. I believe think Apple 30" Cinema Display was one that required it. Hmm, I've found an image of the ADC plug, it had rounded edges, so that cannot be it. There must be a AC or DC plug jack hidden under a bezel somewhere. Have your friend look there. I also...Leave a comment:
-
Re: Viewsonic Q19WB
You probably shouldn't bother replacing the 100uF 450V. Senior members here (PCBONEZ et al) say that generally they aren't the ones that fail - even the CapXons are OK, because the conditions are less brutal. Plus it'll save about $6....Leave a comment:
-
Re: Another Westinghouse LCM-22w3
I repaired a monitor similar to this one last month. I haven't needed to use an antistatic strap, but I do keep my hand off conductive materials as much as possible. As for the glue, I carefully scraped it off with a screwdriver before trying to replace them.
As for PlainBill's advice - yes, replace all the caps on there that you can, I've seen 5 bad monitors, and 4 of the 5 were completely fixed simply by replacing all the CapXon and/or Elite caps on the Power/Inverter boards. I think the 5th one has a bad MOSFET...Leave a comment:
-
Re: Dell E171FP, GH15/17 Cap Values
Hmm, no pictures. Please try again. The pictures have a size limitation of 2000x2000px (I believe)....Leave a comment:
-
Envision EN7410
I've got a new broken one - 17" Envision EN7410. No camera today, so I'll describe everything. Pictures tomorrow.
Problem with this one is that it randomly powers down after 5-10 minutes of use. The panel wasn't too difficult to take apart, two screws in the bottom corners and 3 hidden latches per side. Easiest to start at the bottom. Opened with a letter opener and a small cross point screwdriver, but I think I'd recommend a pair of smallish flat screwdrivers. The panel itself says 'Quanta'. To get the power/inverter board out, 6 plugs, 4 under some shiny tape, and 4 screws... -
Re: Optiquest Q9 no power
Both Optiquests were brought back to life by changing out 4 caps closest the the transformer. I didn't replace the big cap (100uF/400V) because others said there wasn't a need, and I didn't replace the little cap (10uF/50V) because it was in a crowded neighborhood with lots of surface mounted caps on the underside where it lives, and I suspect I'll do more harm than good trying to take that bad boy out.
For the record, I used Panasonic FCs for most replacements, and a Nichicon HE for the 470uF part. The original part I ordered for the 470...Leave a comment:
-
Re: Westinghouse 19" Power/Inverter
Surprisingly, none of the fuses were blown, and with a bit of soldering some new Panasonic FM/FC series to replace the CapXon caps the monitor works again. Well, not exactly - I had to then fixing my poor cold solder joints - tin solder is no fun. I seem to remember getting tested in electronics class. If the teacher could pick the board up by the resistor after soldering with no joints snapping - pass. If either of the joints snapped (or worse, the board fell) - fail.
Thanks for the help everyone.Leave a comment:
-
Re: common notebook fixes/mods
Oh and another one (going back a bit - 13 years or so). The Apple PowerBook G3 Bronze Keyboard (Pismo), had a notoriously bad cold solder joint to the DC jack on a tiny power/sound board. The DC jack on a PowerBook resembles a Television A/V connector and frequently when plugging the thing in, you will hear sparking. If you try to avoid the sparking by plugging the DC jack in first, then plugging the AC part in, you will fry the PMU (Power Management Unit) circuitry. Frequently, the forces on the DC jack would snap the cold solder joint and leave the...Leave a comment:
-
Re: common notebook fixes/mods
I've got one: (no fix though)
Compaq Presario X1000 series - This computer was a Intel Pentium M with Intel wireless (Centrino brand) plus a video card ATi 7000/9200* on daughterboard. It seems that the video card would eventually start failing about 3 years into laptop ownership. The reason is heat, the question is what the heat affected. Usually pushing down hard on the spot right above the F6 key would temporarily cure the problem. Some said their cards warped, and needed to be pushed in harder, so they used rubber washers to exert...Leave a comment:
-
Re: Digital decade PSU
I'm curious, what kind of caps did you replace the CapXon (aka crapxon) with? Did you replace the big behemoth (400V) cap, or keep it? Just wondering, because the consensus here seems to be that the input filter caps (is that the right term?) don't take as much of a beating as the littler caps (pi filters? voltage regulators?). Pictures would be nice, too. I'm wondering if the voltages the earlier rev puts out differ from the later rev D board.
As for my soldering progress - I have none to report yet, as the iron just wasn't cutting it. I ordered...Leave a comment:
-
Re: Troubleshooting Mag LT865B
Nope, I don't see the PDF. Maybe it was too large to upload? Anyone know if there's a PDF size limit?
As for the 12V, that's good news. Now for the bad news: I've heard horrible things about Teapo caps, though, so you'll probably want to replace all of them, even the little beggars. Chances are (according to some other threads here) that caps below 470uF won't really show signs of failure, they'll just quietly drop their capacitance to near nothing. If there's one thing that the crapcap companies are getting better at, it's hiding their...Leave a comment:
-
Re: Troubleshooting Mag LT865B
Last thing:
Are there any fuses near the 12V input? If your 12V DC power is good, then check for open fuses on your power board, near the input jack. Usually, they have an F designator on the silkscreen. Some look like a small black button (radial type), others look like little green or purple resistors (axial type). I'm sure there's more types than I know about.
Hmm, I don't see any in your pictures, but I'm no expert. It's possible the fuse may be in the power brick. But, please, don't crack it open on my say so, and...Leave a comment:
-
Re: Troubleshooting Mag LT865B
We need some more information:
1) What kind of caps are on your board? If they fall into the bad cap list, you'll probably want to replace them all. Also, some may fail with no visible indicators, so keep that in mind.
2) You mentioned a 12V DC power supply. Have you tested the output with a Voltmeter? It is quite possible there are some bad caps in there as well - that's what I've heard anyway. But I wouldn't crack it open until a senior member tells you that you should, or the output is not 12V DC.
Post...Leave a comment:
-
Re: Westinghouse 19" Power/Inverter
Confirmed. Those are F200 and F201, respectively, they are 3A 125V fuses (according to silkscreen)
Good eye, Bobdee!...Leave a comment:
-
Re: Westinghouse 19" Power/Inverter
Here are the pics....Leave a comment:
-
Westinghouse 19" Power/Inverter
I believe this Westinghouse 19" widescreen is a rebranded Optiquest. Won't power up when plugged in. A lot of the parts inside say ViewSonic or OptiQuest. The Power/Inverter board is a DELTA, which outputs both 5Vdc, 3.0A and (inverter) 1250Vrms, 4.5 to 5.5 mA.
This unit has 5 bulging CapXon capacitors (hmm, beginning to see a pattern here), a likely blown fuse (3.15 A, 250 V radial button-type fuse), and a potentially blown resistor (and possibly the neighbouring inductor). A majority of the bulging CapXon capacitors have date code P608, so 8th week 2006. Here's the list of... -
Re: Optiquest Q9 no power
Here are the pics:...Leave a comment:
No activity results to display
Leave a comment: