Home |
Search |
Today's Posts |
|
Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
Reply |
|
LinkBack | Thread Tools | Display Modes |
#1
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
Hi,
Working without a service manual on this one and have 2 more just like it. Plug power in and it sorta flickers on and off, power/status LED flickers different colors several times and finally stabilizes at a stedy flashing green about once per second and the backlight pulses about the same frequency. I noticed a myriad of SMD caps and checked most of them for high ESR, most are pretty decent, a couple are marginal but seem to be alright. uPC supply voltages seem pretty solid so I'm kinda stumped. Anybody seen this problem before, being as I have 3 of these all failed near the same time I'd suspect it's a common problem or soon will be. Thanks, Benjamin Jennings, MCP |
#2
|
|||
|
|||
Two things:
One: do they all have the same symptom ? If so have you plugged in a valid input ?? (to EACH) Two: if they do not have the same symptom, what are the other symptoms ? Thinking of it this way can get you down to board level real fast, but don't rush to sell anything that works, use it as a reference to fix another. Happens all the time. JURB |
#3
Posted to sci.electronics.repair
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
responding to
http://www.electrondepot.com/repair/...lem-44095-.htm , SolarAngel wrote: icesoft wrote: Hi, Working without a service manual on this one and have 2 more just like it. Plug power in and it sorta flickers on and off, power/status LED flickers different colors several times and finally stabilizes at a stedy flashing green about once per second and the backlight pulses about the same frequency. I noticed a myriad of SMD caps and checked most of them for high ESR, most are pretty decent, a couple are marginal but seem to be alright. uPC supply voltages seem pretty solid so I'm kinda stumped. Anybody seen this problem before, being as I have 3 of these all failed near the same time I'd suspect it's a common problem or soon will be. Thanks, Benjamin Jennings, MCP I have similar behavior but monitor shows screen after several minutes. Do you by any chance remember what was the problem with this monitors ??? |
#4
Posted to sci.electronics.repair
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
On Mon, 03 Dec 2012 15:18:02 +0000, SolarAngel
m wrote: responding to http://www.electrondepot.com/repair/...lem-44095-.htm , SolarAngel wrote: icesoft wrote: Hi, Working without a service manual on this one and have 2 more just like it. Plug power in and it sorta flickers on and off, power/status LED flickers different colors several times and finally stabilizes at a stedy flashing green about once per second and the backlight pulses about the same frequency. I noticed a myriad of SMD caps and checked most of them for high ESR, most are pretty decent, a couple are marginal but seem to be alright. uPC supply voltages seem pretty solid so I'm kinda stumped. Anybody seen this problem before, being as I have 3 of these all failed near the same time I'd suspect it's a common problem or soon will be. Thanks, Benjamin Jennings, MCP I have similar behavior but monitor shows screen after several minutes. Do you by any chance remember what was the problem with this monitors ??? Check with the folks at www.badcaps.net/forum PlainBill |
#5
Posted to sci.electronics.repair
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
wrote in message
... On Mon, 03 Dec 2012 15:18:02 +0000, SolarAngel m wrote: responding to http://www.electrondepot.com/repair/...lem-44095-.htm , SolarAngel wrote: icesoft wrote: Hi, Working without a service manual on this one and have 2 more just like it. Plug power in and it sorta flickers on and off, power/status LED flickers different colors several times and finally stabilizes at a stedy flashing green about once per second and the backlight pulses about the same frequency. I noticed a myriad of SMD caps and checked most of them for high ESR, most are pretty decent, a couple are marginal but seem to be alright. uPC supply voltages seem pretty solid so I'm kinda stumped. Anybody seen this problem before, being as I have 3 of these all failed near the same time I'd suspect it's a common problem or soon will be. Thanks, Benjamin Jennings, MCP I have similar behavior but monitor shows screen after several minutes. Do you by any chance remember what was the problem with this monitors ??? Check with the folks at www.badcaps.net/forum PlainBill Replacing caps fixed my Viewsonic - watching it right now. Mark Z. |
#6
Posted to sci.electronics.repair
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
On Tue, 4 Dec 2012 07:22:40 -0600, "Mark Zacharias"
wrote: wrote in message .. . On Mon, 03 Dec 2012 15:18:02 +0000, SolarAngel m wrote: responding to http://www.electrondepot.com/repair/...lem-44095-.htm , SolarAngel wrote: icesoft wrote: Hi, Working without a service manual on this one and have 2 more just like it. Plug power in and it sorta flickers on and off, power/status LED flickers different colors several times and finally stabilizes at a stedy flashing green about once per second and the backlight pulses about the same frequency. I noticed a myriad of SMD caps and checked most of them for high ESR, most are pretty decent, a couple are marginal but seem to be alright. uPC supply voltages seem pretty solid so I'm kinda stumped. Anybody seen this problem before, being as I have 3 of these all failed near the same time I'd suspect it's a common problem or soon will be. Thanks, Benjamin Jennings, MCP I have similar behavior but monitor shows screen after several minutes. Do you by any chance remember what was the problem with this monitors ??? Check with the folks at www.badcaps.net/forum PlainBill Replacing caps fixed my Viewsonic - watching it right now. Mark Z. Thaat is a common problem. However I didn't feel like explaining ESR, explaining why the caps he could buy in a $5.00 bag at Radio Shack weren't good enough, why spending a few bucks less and waiting a couple of days for delivery was a good idea, and above all trying to troubleshoot without pictures. PlainBill |
#7
Posted to sci.electronics.repair
|
|||
|
|||
Viewsonic VG800 LCD monitor power problem
responding to
http://www.electrondepot.com/repair/...lem-44095-.htm , SolarAngel wrote: I know about bad capacitors, but wanted to know for sure is this common problem with all ViewSonic models, and does it result in this kind of problem - waiting for several minutes for screen to light up. have found service manual for my model on net, and wondering to replace bad caps my self. but also was wondering to replace bad caps with little higher voltage capacitors. for example 50uF 20V to replace with 50uF 40V. could this produce some problems or to go with this plan!? but first need new monitor (how else to read service manual), and funny thing I have found exactly same model for free, only difference second one was sitting 5 years in box LOL need only to drive to uncle to get it |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Marantz sr-63 problem | Electronics Repair | |||
Icemaker problem | Home Repair | |||
Viewsonic 19" monitor color problem | Electronics Repair | |||
Wiring problem | Home Repair | |||
viewsonic problem | Electronics Repair |