Viewsonic Q19WB

[justintempler]

My monitor finally died today after it started having problems staying powered up a little over a month ago. No big deal, I used the advance warning to replace it before it died. I do want to repair it though to keep as a backup.

Inverter ILPI-025 REV:E 2007.01.15 79069140

I have fixed numerous electronic items but never an inverter module.

I have the unit disassemled.
C815 1000mf 25v (bulging)
C818 1000mf 10v
These seem to be the two most important parts to replace as they are directly connected to the switching transistors D803 & D805

I also plan on replacing:
C820 47mf 25v
C501 470mf 25v
C817 470mf 25v

I was open to suggestions from people with more experience as to what other parts you would replace, if any? It seems silly to me to just go ahead and replace every single cap on the board and totally ignore switching transistors and various diodes and what about the ceramic disc caps?

Anybody know the part numbers/values of D803, D805, C813, C814 ?

Thanks

[PlainBill]

Re: Viewsonic Q19WB

My monitor finally died today after it started having problems staying powered up a little over a month ago. No big deal, I used the advance warning to replace it before it died. I do want to repair it though to keep as a backup.

Inverter ILPI-025 REV:E 2007.01.15 79069140

I have fixed numerous electronic items but never an inverter module.

I have the unit disassemled.
C815 1000mf 25v (bulging)
C818 1000mf 10v
These seem to be the two most important parts to replace as they are directly connected to the switching transistors D803 & D805

I also plan on replacing:
C820 47mf 25v
C501 470mf 25v
C817 470mf 25v

I was open to suggestions from people with more experience as to what other parts you would replace, if any? It seems silly to me to just go ahead and replace every single cap on the board and totally ignore switching transistors and various diodes and what about the ceramic disc caps?

Anybody know the part numbers/values of D803, D805, C813, C814 ?

Thanks

See my response in the other forum.

PlainBill

[justintempler]

Re: Viewsonic Q19WB

The Viewsonic Q19WB looks almost identical to the Acer AL1916W found here:
https://www.badcaps.net/forum/showthread.php?t=7777

The only difference I can tell is the Viewsonic has an additional audio circuit which is missing on the Acer AL1916W

This is the attachement with the 5 caps I had planned on replacing:
https://www.badcaps.net/forum/attach...chmentid=11474

The audio section of the board has 5 caps which I can safely ignore replacing.

so that leaves
C807 47mf 25v
C827 47mf 25v
and the monster C804 100mf 450v
That brings the total to 8 caps for replacement.

D803 (SP10100c) D805 (SP1040c) are Schottky Barrier Rectifiers, I'll ignore replacing those unless someone thinks otherwise.

[PincushionMan]

Re: Viewsonic Q19WB

The Viewsonic Q19WB looks almost identical to the Acer AL1916W found here:
https://www.badcaps.net/forum/showthread.php?t=7777

The only difference I can tell is the Viewsonic has an additional audio circuit which is missing on the Acer AL1916W

This is the attachement with the 5 caps I had planned on replacing:
https://www.badcaps.net/forum/attach...chmentid=11474

The audio section of the board has 5 caps which I can safely ignore replacing.

so that leaves
C807 47mf 25v
C827 47mf 25v
and the monster C804 100mf 450v
That brings the total to 8 caps for replacement.

D803 (SP10100c) D805 (SP1040c) are Schottky Barrier Rectifiers, I'll ignore replacing those unless someone thinks otherwise.

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.

[akmo512]

Re: Viewsonic Q19WB

The Problem was the power shut off after 1 sec

The fix I only had to replace 1 CAP , I have Been replacing with similar farads MORE voltage to insure LIFE

Look at the middle of the board closest to the inverter ...That was the cap for me

Many problems result in power failure, I was lucky to spend 20$ on this monitor spent 30- min to an hour to fix great deal.

[Mouse]

Re: Viewsonic Q19WB

I'm having a similar problem with a q19wb.
Opened it up and found no evidence of any sort of internal damage, or bad caps.
I read all the related threads and decided to change the same 5 caps anyways...
https://www.badcaps.net/forum/attach...chmentid=11474

Put it back together, no change.

It turns on, receives signal albeit low light, grainy and flickery.
After 2-3 seconds the display shuts down.
I'm testing it as the second monitor on a dual display, so i can change the resolution while it's running.
Upon the change, signal is received, display is dark, grainy and shakey, then off again.
The dual monitor setup works fine with another monitor.

[retiredcaps]

Re: Viewsonic Q19WB

After 2-3 seconds the display shuts down.

If this is "2 seconds to black", then see (starting with post #13 and #14)

https://www.badcaps.net/forum/showthread.php?t=10419

Start with that and ask questions. Concentrate on

a) bad caps
b) bad secondary inverter transformer
c) bad ccfl
d) bad ccfl wiring