Whoa didn't know that, thanks a lot for the info!
Yes I've been reading that forum also
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Neobyte
Learning..
Last Activity: 03-26-2023, 06:52 AM
Joined: 01-14-2011
Location: Finland, Tampere
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Re: 2 Viewsonic VX1940W buzzing and no signal
Whoa didn't know that, thanks a lot for the info!
Yes I've been reading that forum also...
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Re: 2 Viewsonic VX1940W buzzing and no signal
I understand. It seems that the small cap was united chemi-con and the series is SME. I found this datasheet. There's some max 22uF (50V) ESR values measured in 120Hz. So if the ESR is too high it causes the low voltage?
I got the same steady 10,03V from that measurement also. So it is below 10,3V. I may try to change that cap someday, if I just could find better ones somewhere. Thanks also for the soldering feedback, appreciated!...Leave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
Ok I got a pic of the right controller. In the same pic you can see the soldering of that small cap. It was difficult place and I have suspicions. Maybe I should try to resolder that one. Closest datasheet I could find was this:
[url]http://pdf1.alldatasheet.com/datasheet-pdf/view/394433/NXP/TEA1530AP.html[/url]
I didn't reuse any caps, but my supplier had wide variety of brands. So the small cap is SME(?) and there are also two other SMEs. One rubycon and one unknown. I'm not sure which series....Leave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
The IC on the back is BIT3715 and the datasheet is here:
[HTML]http://monitor.espec.ws//files/bit3715_633.pdf[/HTML]
b 800 c I d 800 (is it 800mV or what?)
Test #3 was 0V as you guessed.Re: 2 Viewsonic...HTML Code:Re: 2 Viewsonic VX1940W buzzing and no signal The IC on the back is BIT3715 and the datasheet is here: [HTML]http://monitor.espec.ws//files/bit3715_633.pdf[/HTML] b 800 c I d 800 (is it 800mV or what?) Test #3 was 0V as you guessed.
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Re: 2 Viewsonic VX1940W buzzing and no signal
Yes I was aware of that cap's role and I also changed that one. It was 22uF (50V). I measured that one also and got steady 10 V (DC). What's next?
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Re: 2 Viewsonic VX1940W buzzing and no signal
Yes it should be 5V. Every pin shows close to zero voltage (maybe it's zero then). <0,1V anyways.Leave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
Ok, I got 321V from there
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Re: 2 Viewsonic VX1940W buzzing and no signal
Black, ground from the corner screw area and red to the positive leg of the cap. My meter was at 600V (DC).. I don't have too much experience measuring these things....Leave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
PlainBill, I tried to measure the voltages. I suppose the output is the connector going to the logic board? There wasn't much voltage present. Then I checked the large cap, the voltage was ~105V. Is that toasted too? (I did not change that during my recap operation)
edit: Btw I have 230V mains.Last edited by Neobyte; 01-17-2011, 11:20 AM.Leave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
No power at all. Power led doesn't go on. Ermm, I found 3 fuses total, F1 (surface mount) on the 'long board', and psu-board F101 and F301. They all measured close to 0 ohms. Dunno if there's more of them? :PLeave a comment:
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Re: 2 Viewsonic VX1940W buzzing and no signal
Recapped the monitor now. Didn't help anymore. Must be some other component failing? Don't know what. Here's image of the smps-board..
It's trash unless someone figures any tricks
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Re: 2 Viewsonic VX1940W buzzing and no signal
first msg on this great forum. Finally found this thread I was looking for. My monitor is model VX1940wm to be exact.
I have _exactly_ the same story as briand. Had VX922 and it was replaced to this monitor and it failed too. First time I changed only the 2 bulged caps, and the monitor worked like 1-2 month(s). After the first repair, one vertical cyan line appeared on the screen after heating up. By pressing the screen the line disappeared. Don't know it this is due some bad connection or connector.
Anyways,...Leave a comment:
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