ViewSonic VX2235wm...

[r3m1x]

hello ladies and gentleman,

So i have a ViewSonic VX2235wm LCD display. The problem with my monitor is that whenever i power it on, the blue light comes on, but with a black screen. I have to disconnect and reconnect the VGA connector a couple of times on the monitor in order for the screen to show up. I'm not a technical person when it comes to LCD monitors and i did try to open it up to see if i could solve the problem, but i had no luck, however, i think the problem has to do with the VGA connector. After i finish using the monitor and turn it off for about an hour, then try to turn it back on, i have to go through the same process again of disconnecting and reconnecting for the screen to show up. i have googled for an answer, but i can't seem to find something similar. if anybody can help me out i'd appreciate it so much!


Thanks everyone!!

[PlainBill]

Originally Posted by r3m1x

hello ladies and gentleman,

So i have a ViewSonic VX2235wm LCD display. The problem with my monitor is that whenever i power it on, the blue light comes on, but with a black screen. I have to disconnect and reconnect the VGA connector a couple of times on the monitor in order for the screen to show up. I'm not a technical person when it comes to LCD monitors and i did try to open it up to see if i could solve the problem, but i had no luck, however, i think the problem has to do with the VGA connector. After i finish using the monitor and turn it off for about an hour, then try to turn it back on, i have to go through the same process again of disconnecting and reconnecting for the screen to show up. i have googled for an answer, but i can't seem to find something similar. if anybody can help me out i'd appreciate it so much!


Thanks everyone!!

That's an interesting story, but it doesn't tell us much. I'd suggest you open the monitor up, and take pictures of the top and bottom of the power supply. For best results, the pictures should be at least 1000 pixels but less than 2000 pixels on a side. Attach them to your next post. using 'Manage Attachments' - below the text entry area.

PlainBill

[r3m1x]

attached are the screenshots of the full monitor, top and bottom, plus the circuit board/power supply. thank you!

[retiredcaps]

Even with the flash, I can see at LEAST 4 bulged/domed caps. Since 4/9 failed (or almost 50% failure rate), we recommend replacing ALL the electrolytic capacitors except the largest one which rarely, but not never, fails.

PCBONEZ will if I don't explain that when replacing caps, you want the same or more ripple and the same or less ESR (ohms) as per

http://www.badcaps.net/forum/showpos...47&postcount=3

Members here like Panasonic FR, FM, and FC in that order. You can follow PlainBill's instructions at

http://www.badcaps.net/forum/showpos...33&postcount=2

[PlainBill]

Originally Posted by r3m1x

attached are the screenshots of the full monitor, top and bottom, plus the circuit board/power supply. thank you!

Not exactly what I asked for, but good enough that some problems are obvious.

Caps circled in red. Definitely bad, replace.

Caps circled in orange. Could be bad, replace.

Caps circled in yellow. Not visibly bad, but it would be a very good idea to replace them.

PlainBill

[r3m1x]

thanks for all the help guys! i appreciate it! i will try to replace these bad caps.

[r3m1x]

hey guys, i have another different question. would the caps have anything to do with how the screen doesn't show, but only the blue light powers on, and if so, how can i safely change these bad caps. will the caps be safe to touch once i disconnect the power and give it a few minutes. also, can you guys recommend places where i could get these replacements on the attachments. thanks for your patience. i know i'm a noob, but with you guys help i can learn.

[PlainBill]

Originally Posted by r3m1x

hey guys, i have another different question. would the caps have anything to do with how the screen doesn't show, but only the blue light powers on, and if so, how can i safely change these bad caps. will the caps be safe to touch once i disconnect the power and give it a few minutes. also, can you guys recommend places where i could get these replacements on the attachments. thanks for your patience. i know i'm a noob, but with you guys help i can learn.

The faq has information on removing caps; there also are videos on youtube.

This procedure will walk you through the process of selecting replacement caps.

PlainBill

[r3m1x]

LCD screen question: so i recently noticed a green spec on my monitor screen whenever it goes to a black image/background. is there a way to fix this? is there maybe dust inside?

[shovenose]

See if it goes away with the capacitor replacement. Let's tackle one thing at a time here.
If it doesn't go away after the capacitors have been replaced, then we can advise further.

[PlainBill]

Originally Posted by r3m1x

LCD screen question: so i recently noticed a green spec on my monitor screen whenever it goes to a black image/background. is there a way to fix this? is there maybe dust inside?

Stuck pixel. Unrepairable, unless you want to replace the panel.

PlainBill

[r3m1x]

hey everyone!

i've replaced 3 small capacitors successfully and the screen doesn't give me problems anymore. i still have 2 more to replace of which i couldn't find at the store and need to be ordered, but i want to thank everyone who helped me resolve this issue. you guys are the best!


Thanks

[pedro]

Originally Posted by r3m1x

i've replaced 3 small capacitors successfully and the screen doesn't give me problems anymore.

That's good news, BUT ...

i still have 2 more to replace of which i couldn't find at the store

every time I see that sort of statement I tremble. What store? What brand/series of caps did you use?

[r3m1x]

Originally Posted by pedro

That's good news, BUT ...

every time I see that sort of statement I tremble. What store? What brand/series of caps did you use?

i went to an electronic store like Frys Electronics.

[jetadm123]

Originally Posted by r3m1x

i went to an electronic store like Frys Electronics.

Fry's does not sell low-esr caps. Most stores only stock general purpose caps. You should replace the existing caps (with the exception the large 450V, which rarely fails) with low-esr ones like the Panasonic FR, FM or FC series, or you'll likely be opening your monitor again in the near future.

[r3m1x]

Originally Posted by jetadm123

Fry's does not sell low-esr caps. Most stores only stock general purpose caps. You should replace the existing caps (with the exception the large 450V, which rarely fails) with low-esr ones like the Panasonic FR, FM or FC series, or you'll likely be opening your monitor again in the near future.

well, so far the monitor is working just fine, but if otherwise i will look into different places to purchase.

[PCBONEZ]

GP caps typically have lower Ripple Current ratings and won't last as long as the proper caps.

Interestingly I just got one of these as a freebie, but I won't have time to look at it until late next week.
.

[retiredcaps]

Originally Posted by PCBONEZ

GP caps typically have lower Ripple Current ratings and won't last as long as the proper caps.

Well at least 5 people have mentioned using low ESR caps in this thread alone.

You can lead a horse to water ...

[PCBONEZ]

Here is the original caps list for this one.
It has Power Board: Delta: DAC-19M009-AF, REV: 01A
.

[shadowcruise]

Thanks PlainBill & PCBONEZ for the information you provided in this thread. I have three monitors with the same power boards with similar issues. Your posts enabled me to place an appropriate order @ Digikeys.