I have a Viewsonic VE710B that slowy started to turn off by it self/wouldn't wake up from screen saver mode. The screen would stay black but would have the green light blinking. Now it's nothing, sometimes It will breifly turn on then off.
Heard the Caps were a prime suspect so I dug in.
Caps look okay too me all flat at the top.
How can I test the fuse and caps with a multimeter?
Heres some pics of what I working with...
What are my options on trouble shooting/fixing this LCD?
Iv'e seen a page with someone attaching a old cheap PSU from a computer to on the back of the LCD.
Wires from PSU to small board in LCD (analog board?)
More about :viewsonic open
December 22, 2009 4:32:44 PM
I'd replace the two Caps by the heatsink by the yellow coloured component. The PSU board on yours is slightly different from the Viewsonics I fixed recently but that'd be my guess.
To be safe you might replace the other two of the same size (they are probably the same spec). Capacitors are cheap.
Check the specs (printed on the plastic wrap) or take one of each type to a decent electronics hobby store, they'll guide you -- I bought ones of a slightly higher voltage.
The most useful tool (aside from a soldering iron) is a simple desolder pump. You don't need a meter.
Bulging is usually at the aluminium cap end -- but on the two Viewsonics I fixed a cap was bulging on one but the other monitor's board appeared perfect. Replaced the two caps as described, both monitors worked immediately.
The symptoms on these were that the screen would come on normally at boot up but within a minute went dark -- perhaps the screen illumination, perhaps went into stand-by.
As I said caps are cheap, to save making another journey I bought more than I thought I needed.
Solder pump is the only sensible way to remove components -- saves damage to the board. Basically, draw out the hot solder. Wait while the board cools and then waggle the component -- will usually break any remaining connection.