Re: Lot of Viewsonic VA902 being recapped
Thanks, Rtech, for your assistance. Couple questions on it though:
1) How do I go about testing the ICs (it has been quite some time since my circuits class in college, and I'm a ChemE, so they went pretty light on the electronics courses)?
2) Are the inverter transformers the two high voltage ones near the backlight plugs?
Thanks in advance for your help.
EDIT: Nevermind, I think I found the information I needed by searching the forum. Thanks again.
KyleSTL
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Last Activity: 07-21-2013, 11:08 PM
Joined: 08-29-2011
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Re: Lot of Viewsonic VA902 being recapped
Update on my monitor project. I have successfully repaired 31 monitors for my company to date (including 23 of this exact model). However, there are 3 monitors [of this model] I have not been able to make fully functional (despite recapping with KZE on all 6 filter caps), and by constructing many permutations of known good parts, I have determined that all 3 have issues solely with the power board. Monitors A & B have the same problem, and Monitor C has a different problem - I'll explain them below:
Monitors A and B -...Leave a comment:
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Re: Westinghouse LCM-19W4
I have a couple DMMs, and I believe I was using my Sperry. I could check the model number when I get home. The other one is a tiny Radio Shack model I keep around because it is small and durable, and has the leads permanently attached.Leave a comment:
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Re: Lot of Viewsonic VA902 being recapped
Just to follow up, the United Chemi Con KZE caps have worked wonders since September. I have fixed (13) VA902B monitors, and six other makes/models since then. I have been credited with saving my company thousands of dollars. Thank you PlainBill, jsog and alexanna for your help.Leave a comment:
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Re: Westinghouse LCM-19W4
Thanks retiredcaps.
My MM reads x.xxx ohms in the continuity setting. They were all < 0.010 ohms.
I will order Part # IPS135N03LGIN-ND from digikey per the thread about 40T03GP. Thanks again for your help.Leave a comment:
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Re: Westinghouse LCM-19W4
OK, all the fuses (250V and the small surface mount ones on the back) have continuity.
I checked the leads on the two MOSFETs, and one of them had 0.6 Ohm across two of the leads. All the other permutations were discontinuous (all the MOSFET testing with my multimeter was performed with the board completely unplugged, but the MOSFETs still attached to the board).
I assume this means I will need to replace the MOSFETs to get it working again, correct?Leave a comment:
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Re: Westinghouse LCM-19W4
My apologies, first time I've sumbitted pictures. Please let me know if they are not focused enough. They were quick-and-dirty pictures in bad lighting.Leave a comment:
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Westinghouse LCM-19W4
I have a Westinghouse 19" widescreen monitor that I have recapped with United Chemi Con KZE series capacitors, and it is still only partially working. When I first opened it about half of the filter caps were bulged.
After putting the board back into the monitor and powering it up, I noticed the LCD was displaying the image, but there was no backlight. After that I used another board to power the backlights, and the monitor functioned perfectly (the display board was still being powered via the original board). All four CCFL's were tested individually, and they all lit....Last edited by KyleSTL; 02-06-2012, 08:32 PM. -
Re: Lot of Viewsonic VA902 being recapped
Thanks for the help guys. I have ordered new caps for all the monitors (United Chemi-Con KZE series). Should be in next week, I'll repost when I get them in and installed. Should have been more diligent before making the first order.
alexanna, the Cardinals are my second favorite team (behind the Reds, since I'm from south-west Ohio). I'm going to the game tonight against the Reds with my company's corporate tickets. Should be quite enjoyable.Leave a comment:
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Re: Lot of Viewsonic VA902 being recapped
Jsog,
What would be a good low ESR cap that goes up to 25V? I looked at the preferred caps thread (after I had already ordered them, of course - measure once, cut twice) and a lot of them only went up to 16V.
EDIT: Nevermind, clicked through them and figured out which were up to 25V.
Is there any way to tell if the non-low-ESR caps are my problem?Last edited by KyleSTL; 09-02-2011, 10:10 AM.Leave a comment:
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Re: Lot of Viewsonic VA902 being recapped
Ah, all my versions had removable external cables for the VGA to the computer. I just saw you're in St Louis. I am as well.Leave a comment:
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Re: Lot of Viewsonic VA902 being recapped
PlainBill,
The old caps were all Su'Scon brand (I'll have to check the series later) with the following ratings:
(1) 25V 1000uF
(3) 25V 220uF
(2) 10V 1000uF
I replaced all of them with Nichicon VZ series caps of the same capacity. All polarity is correct. I will take pictures sometime tonight, or early next week and upload them (front, back, and ribbon cable to the LCD). My power supply board looks considerably different than the one depicted in the old VA902 thread. Also, I realized this...Leave a comment:
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Lot of Viewsonic VA902 being recapped
I have 9 Viewsonic 19" VA902 monitors that I am recapping. I first disassembled them and found bad caps in all of them. I put in a Digikey order for enough to fix them all. I was very meticulous in keeping the LCD screens of each one with the original display controller board. Two nights ago I removed all the bad capacitors from the PSU board, but left one in-tact for an example to reference while I put on the new caps. Today I got the order in and started to recap. After 3 montiors back together, not a single one works properly (1 the backlight is not coming on [likely a loose connection... -
Re: Planar PL1700-BK - backlights go out
Very nice, I'll give that a try. Thanks for your help. I'll post how it goes.
If it is the CCFL's, how much do they usually go for, and how difficult (or risky) are they to replace? Any good websites to buy CCFLs?
EDIT: Nevermind, saw the links posted earlier in the thread.Leave a comment:
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Re: Planar PL1700-BK - backlights go out
This is my first post on Badcaps forums. I work for an industrial company we recently had a plague of monitors dying. They were about to hand them off to an E-waste company for free, and I offered to take a couple home and see if they just needed some caps replaced (I replaced caps on several motherboards before with a perfect record).
The (9) Viewsonic VA902s have the same symptoms so I went ahead and ordered enough to fix 10 of them after I got the first one opened and counted up the blown caps. There were a couple other...Leave a comment:
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