Question about Audio Players & Recorders
Machine stays in try me mode. sound machine goes off after a few seconds. didn't have instruction with it.
Posted by Anonymous on
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Posted on Jan 02, 2017
This problem is very often caused by dry electrolytic capacitors on the inverter board. If you have some skill with soldering you could try to change them. When buying new ones ask for LOW-ESR capacitors for switching mode power supplies (SMPS) and 105°C, they are a little bit more expensive than normal electrolytic capacitors, but are designed for this aplications so they lasts more. Normal el. caps will also works fine so when you cannot buy LOW-ESR for SMPS use normal ones.
This is a FIX ONLY for Rosewill R710E 17 inch Flat Panel LCD Monitor!
Symptoms: The LCD screes shows up for half second or more and turns black, but the LED light remains green and reflecting the light to the screen can be seen the screen working.
Changing the 1000uF condensator at 16V should make work your back lights like new. Usually when this problem occur you will see malformed (has to be flat at the top) at the top that peace of bad condensator. The board on work for this issue is the inverter located at the left side looking from the back. NOTE*** To prevent any accidental damage of other boards unscrew the inverter and work independently with it, specially the part with the soldering.
had same problem with my Sceptre X9S-Naga II 19", which I'd had to replace within a week of original purchase because of an apparently-identical problem at that time. Pissed me off that this second monitor had just 2 years' worth of use on it...I paid $500 in the day, now worth about $200 if new. I wonder if this lack of longevity is to be expected from LCDs, esp. considering the CRT I finally offed was 9 years old with never a problem.
In the end, it breaks out like this:
470uF/35VDC electrolytic capacitor from Radio Shack: $1.66
Hours here and there over the course of a week spent dissassembling, poking, prodding, and googling: incalculable
Satisfaction of resurrecting monitor: $200 plus landfill karma-credit
I had some assistance from a very public-spirited electronics repair website put up by a guy in Malaysia, without which I probably would have run the thing over with a truck by now. His pertinent web page is http://www.electronicrepairguide.com/lcd...
There is a /lot/ of info there--sift through the maze of pages and see what he's got to share from his tech experience.
Details: In my case, I had no fancy meter to check almost anything while in place, just an aging DVM. There was a chance that one of the lamps was bad (an easy but possbily expensive replacement) so I decided to pull them out of the pockets they slide into (like...fission control rods at your nearby nuke plant) so that I could directly see what they were doing during the brief power-on time. These are amazing ultramini fluorescent tubes, or at least closely resemble them in color, proportions, and wiring. They're powered by an inverter circuit that feeds them chopped high-voltage, I believe. When I reconnected them, now out of their wells, and powered up, they ALL came just partway on--not the full length of each tube, much like a fluorescent tube does when it is struggling to start--and just before my power-indicator would quit. I swapped around the lamp connectors to see if the performance would change, and it remained the same...so I knew it wasn't likely to be any lamp that was the problem.
The power supply was producing SOMETHING at some points on the board, but I had no idea what to expect or where. 80VDC at one point seemed wildly high, but turned out to be OK in the end.
On about day 67, brute force triumphed over lack of training and service data: I found the guilty cap by desoldering four of the 14 electrolytic caps on the board. I chose the caps I did to start with only because they were 'paired,' so I knew I'd be able to do crude side-by-side comparisons of resistance on them, in order to maybe-kinda-check if one was totally shorted or likely out of spec. The first pair checked out as approximately matching each other. The next pair...DIDN'T. It was ONLY then that I noticed that the cap with the substantially lower resistance (but not a full short) was, actually, BULGING a bit, as I'd hoped to notice from the outset, but it was very subtle. The bulge in the top was less pronounced than at the bottom, so it would never have jumped out at me without having desoldered them, so as to reveal them top and bottom.
A trip to Radio Shack netted me the $1.66 replacement. By this time, I was quite used to plugging and unplugging the AC power cord from the guts that were sprawled across my table, and I had laid out the board on a piece of insulating newspaper with the "cold-cathode" lamps splayed out haphazardly around it. During all testing, on powering up, the power light would come on in a blinking mode, apparently indicating the problem status. I'd hit the button to see if by chance it was going to stay lit solid for more than a few seconds, but every time it would resume the blinking status after a few seconds.
But now maybe it would be different...at last. Beads of perspiration built up on my forehead as I completed the resoldering of the caps I'd pulled. I restored the minimal external connections to the power-board and hit the power button...and was sorely dissapointed to see that it did ALMOST what it had done before. Now it looked like the lamps lit fully--but still would quit after the same brief duration. WTF? How much MORE time could I possibly spend on this?!
It's impossible to make this a long-story-short at this point, but believe it or not, I'm editing a bit of the pain here. The next day, after several more hours of messing with it and hating that the dissassembled stuff had polluted my kitchen table to the point where I was forced to eat elsewhere, I decided I could at least put parts of it back together, even if I WOULD end up running it over with a truck or throwing it out on the freeway. Also, I wanted to see how the lamps looked now, during their brief "on" duration, but when back in place, shining through the actual screen. So I powered it up again after this partial reassembly, and saw...nothing. It was getting WORSE? Where was the lamp-light?
I began to reassess my technique. What connectors had I maybe been too willing to assume didn't matter for testing this power-supply? I reconnected the chassis-ground wire. No difference. WAIT A MINUTE. I had dislodged a wide, fine connector from the back of the screen when I had been taking the lamps out a few days prior. But that shouldn't matter--I'm not sending the thing any data. Still, I'll reconnect it since I have to anyway. The excitement built, but no, STILL no difference. So this was getting weirder--why no lamps NOW? OK, just to be thorough, I reinstalled the video connector cable, to my laptop as before, though I had not needed this during the testing of the lamps while they were out of their ports...so why should it matter now?
Well, it did, though I can't say why. The bright white lamp light, I was thrilled to notice, was peeking through two small holes in the back of the frame, and...it WASN'T GOING OUT this time! So...the $1.66 cap really HAD cured the whole problem; the rest of the issues were artificial problems caused by my ignorance in testing and reassembly laziness.
Back to the basic bad-cap failure: I have NO idea what percentage of similar symptoms would be explained by this silly cap failure, but if I have this happen again, the first thing I will do is gat a bright light and a magnifying glass to inspect the caps for bulging. Even seeing nothing, I think I would remove the caps methodically, and either half-ass test them (as I did with less-than-optimal equipment) or simply replace them all. I'd guesstimate that you could buy all caps for about $20...though it would be a painful thing to do this and still not have a working monitor, I admit.
Posted on Nov 22, 2007
SOURCE: Backlight wont stay on
The inverter board which provides the backlight power isn't working properly. This is a pretty common problem with LCD screens. The inverter is in the display, mounted under the display panel. It's a fairly simple job to replace the inverter. You have to remove the screws holding the front of the display to the back and separate the pieces. The inverter is held in place by a couple of screws and has a couple of cables connecting it to the main board and display panel. Unplug those, remove the inverter, mount the replacement and plug the cables back in. Then reassemble the display. A search on Google for "acer 5315 inverter" turned up several sources for the replacement part. Here is one. I don't know anything about this seller; I just picked it as an example.
Posted on May 19, 2009
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