Re: Socket 775 pin repair
If you can get the pin standing proud (enough), then you can cut a strip of clear plastic about an inch long from a produce container and then kinda slot one edge of it along the pins and gently comb the pins, first in one direction and then 90 degrees to the first direction, gently and paying attention to what the pins are doing (easier to do with a magnifing glass).
xelectech
retired tech
Last Activity: 12-01-2021, 10:01 AM
Joined: 11-21-2014
Location: NC
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Re: No Picture or Audio on Insignia NS-LCD26A
Well, little progress to report, just note to self :
Amazon showed up with 20 35v470uF Nichicon caps for 8 bucks, so got enough to go back and remove the 25v rated ones I tried (didn't help)
The 'cap by the 7legged IC' on pwr bd is C519, 50v47uF was indeed bad, reads 2uF and several ohms esr, replaced it but set is still the same, power led blinks on momentarily and goes right out...tbcLeave a comment:
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Re: No Picture or Audio on Insignia NS-LCD26A
Hi,
I got one of these from a neighbor to repair and it looks like the first one in the thread that actually has bulged caps, 5 on the mainboard and 2 on the PSU board (see attached).
On both boards the caps have 'JH' in a rectangle, but I can't read the values on the psu board yet, the swollen caps on the main board are 470uF, 35 volts, 85 *C.
My question is could I get away with using 25 volt caps? the highest voltage listed for any of the incoming wires is 24 vdc, one of the caps has a...Leave a comment:
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Re: Say you got a free PSU from outside... and it was raining
That's interesting about the replacement of caps taking care of an intermittent memory problem, another clue to add to my collection. I almost always learn something new reading your posts 8-)
As to the replacement caps I used, they're used and tested ok on an esr tester, and, since the board then would start up I left it at that. After a few cycles of different diagnostics (and errors) on various memory-sticks I took a closer look at the memory slots and realized that on the bad slot one...Leave a comment:
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Re: Say you got a free PSU from outside... and it was raining
Very cool, thanks for the info! I owe many thanks to Badcaps.net in general for the numerous clues I've been able to accumulate since I started reading here of adventures in electronic repairs about 3 years ago; I had to replace 2 bulged 1000uF caps in the upper right quadrant of the board before it would start up, I think it was all OST to begin with.
I originally tried to get away with just propping the fan up (kind of haphazardly) but soon learned about random freezes when the fan moved...Leave a comment:
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Re: Thoughts on this ESR meter
Sorry, I meant a good quality like Kester 44 60/40 rosin core, it just usually seems to work ok and excess flux is easily removed 8-). Plus the smoke from it gives me a decent buzz (jk). Thanks!...Leave a comment:
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Re: Thoughts on this ESR meter
If I couldn't see the difference I guess I'd be happy. How 'bout a couple details on the 'good stuff' - how well does it perform and how does the cost compare to, say, 60/40 ?...Leave a comment:
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Re: Thoughts on this ESR meter
I'd recomend one of those 'AY-AT' kits, if you don't mind a bit of soldering.
That way you don't get something with that crappy lead-free solder and suspect looking solder joints all over the place. Have to admit I have no idea of the soldering quality on any of the ready-made testers, other than the $20-esr-tester variety from China (which really sucks, imo).Leave a comment:
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Re: Say you got a free PSU from outside... and it was raining
I acquired my present 'daily-driver' PC, a T5234 Emachine, from a (formerly) drug-scum residence, it had been sitting out with all covers off in the weather for several months, there was even pill-bugs and dirt heaped up along one section of motherboard - took it home, totally disassembled and cleaned it.
Turned out to have a bad memory stick, bad PSU, an over-heating southbridge (I think
that's what it is called) and a bad memory slot. It's been running more or less Ok for a bit over 7 months now...Last edited by xelectech; 11-14-2017, 08:10 AM.Leave a comment:
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Re: Bad Power & Effects Upon PSUs
Just visited that thread, that's an excellent description of a floating neutral in the second post, thanks!...Leave a comment:
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Re: Bad Power & Effects Upon PSUs
Capt Cap said:
"I've had the electric company come out and replace the connectors for the drops, and also took a day off work to meet with an electrician. I think the company that sent the "electrician" out forgot about the appointment, and scrambled some guy over at the end of the day (who turned out to not be a licensed electrician). He showed up at about 6 PM, poked around for about 15 minutes not really doing anything and said we should consider upgrading the service panel and rewire the house, which would cost...Leave a comment:
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Re: Bad Power & Effects Upon PSUs
Now I'm kinda wondering, would a ups maintain a correct output if it happens to be plugged into a 120vac line that has a floating-nuetral problem, or would its operation be somewhat flaky too - guess the quality of ups may be a variable, also....Leave a comment:
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Re: Bad Power & Effects Upon PSUs
Maybe a poor incoming neutral connection, not good for things hooked to it, especially electronics. If you can monitor the voltage both during the flickering and when not you might gather some more clues.
'Course, it might just be poor connections somewhere else, like in the piece of gear itself, or the power/wall switch, etc., but make sure you don't have a floating neutral problem that is progressing.
Good idea, putting the new TV on a UPS, along with any other electronic equipment you care about 8-)Leave a comment:
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Re: ESR meter upgrades
Oh, that the acronym came to me, 'And Yet - An other Tester;
I twisted a couple .1uF caps together to do the self test, then I set em down somewhere, only new ones in the house, grr......Leave a comment:
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Re: ESR meter upgrades
I'd only used 100nF before on the 2 previous testers I had and never had a problem with calibrating, thanks for the info - I'll just twist a couple together and try it with 200nF.
What's "AY-AT"? Gotta go read eevblog now for about 4372 posts......Leave a comment:
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Re: ESR meter upgrades
Thank you sir!Leave a comment:
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Re: ESR meter upgrades
Longtime lurker here checking in - I finally got cable internet a little while ago, never be able to go back now...
Anyway, got tired of not having a working esr meter so tried another one, this time from aliexpress, a supposedly pre-assembled- and working one - but it doesn't work; the problem is it won't measure the capacitor during self-test, just keeps flashing the '>100nF' and 0pF
till it times out and says 'end test' (or whatever). Over a period of 3 days I must have tried to
complete the self-test 2 or 3 dozen times,...Leave a comment:
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Re: High Voltage Probes
I was trying to recall exactly what is in my probe, it's just 2 resistors, I think the high voltage one must be 1000 megohms, its about 4 or 5 inches long and has a hole in either end where a screw goes for attaching a wire, the other resistor is just a normal 1/2 watt 1 megohm one, which the voltage is picked off of, so I guess that makes its input impedance 1 megohm. I wrote down a correction factor that accounts for different input impedances: if R=impedance of the meter, then (1.11 + R) divided by (1.11 X R) is the multiplier to correct...Leave a comment:
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Re: High Voltage Probes
I made a HV-probe back in the 80's, the local electronics store had some HV resistors for real reasonable (can't remember how much, but well under 10 bucks), the rest of the parts'
cost were neglible, scrounged out of junk. Don't need it for TVs anymore, but still have used it to check things like a microwave oven or an electrostatic paint system.
I once used a dmm to check the output of a HID lamp ballast, that was supposed to be
8 or 9 hundred volts, that was the end of that meter's useful life, even though it...Leave a comment:
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Re: Rework Station Pump - Can They Be Repaired ?
Maybe (probably) you could, my ckt drawing skills/understanding are pretty rusty/outdated,
lol!...Leave a comment:
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