Problem with the logic board marked as 0171-2242-0153 and
I have Viewsonic VG150,
Problem with the logic board marked as 0171-2242-0153 and 3150-0122-0150 by means of silk screen on green PCB, looks original by the fab house. Also E11131070 is printed on a white sticky label, affixed at a later time.
The issue is that my VGA image is fuzzy, with white horizontal lines from top to bottom. You can still see the payload image behind the white horizontal lines. The lines seem pretty stable with just slight flicker.
Using deductive logic, I condicted more tests and observed that the built-in menus (generated internally) for contrast, monitor info, etc are perfect. No lines at all. The lines show up only when VGA signal is present.
So I deduced the issue is on the analog part, close to the signal connector - bad pre-amp, bad gate, etc.
Not having schematic I figured the first hit is the Mitsubishi M52743BSP chip. Ok swapped it out (yay $5 at Newark) but my lines are still there and my built-in menus are clear and stable.
I see few AmTran ICs, some a good suspect but I though I should increase my IQ approach in troubleshooting this issue.
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There is something wrong with the main logic board. The firmware thinks that there is a DVI connector installed. Such problems with other devices are fixed by reflashing the firmware. But I don't see any connector on the board for that purpose.The faulty flash memory chip is marked with "A", meaning there is flashed the "A" firmwre version of all possible versions - probably this with only VGA connector. My suggestions are: try to find similar working logic board. I didn't find any on ebay, but you may find somewhere else. The other option is hard one - to try installing DVI connector on this board. Unfortunatelly we don't know the parameters of the parts needed. There have to be several diods, some capacitors and a transistor, all SMD. There is also a missing 8-legged IC probably connected somehow with the DVI. :( Just for case carefully inspect the cpu legs for bad solder.
The sreen gives out grey glowing screen only means that the T-CON board is not getting the 5 or 12vdc feeding it from the logic board, or blown fuse due to short circuits in the T-CON board, you need to troubleshoot it.
IF the backlights are on but you just get dim glowing on the screen when look at the screen in darkened room then the T-CON board is bad or it is not getting the 12vdc from the main logic board. Need to use logical troubleshooting before buying the wrong parts. Hope this works.....
The white glow with no picture means that either the ribbon cable connection between the logic board and the monitor has come lose or dirty contacts, or the LCD Controller (T-CON) board (part of the LCD panel is not getting 5v or 12v depend on LCD panel from the logic board or the LCD controller board has blown fuse, see pictures here for guide (note pin on the LCD board with arrow mark is pin 1 and is the incoming DC power supply line): http://s807.photobucket.com/albums/yy352/budm/LCD%20panel/?action=view¤t=DSCF0881.jpg
You may also want to look for bad caps (bulging top) on the logic board. There should be 5vdc feeding the logic board also.
If you have white glow on thescreen with no pictures, the problem can be the LCD panel controller board (part of the LCD screen) is not getting the 5v from the logic board. See pictures of failed VX2235W for guide as to what to look for first, otherwise you will need new LCD panel. http://s807.photobucket.com/albums/yy352/budm/Viewsonic%20VX2235W/
Buy a new monitor!! Seriously, unless you're the techie type that likes to tear open electronic equipment to see how it works and/or fix it, you're better off buying a new monitor especially if this old monitor of your's is a LCD.