Gaurdall G-LCD19B

[sabre504]

Re: Gaurdall G-LCD19B

Well the parts arrived fitted and still showing 1.95v.

Just debating with myself whether the caps could be doing this as i seem to be getting voltage readings off the top of the caps (not sure if this is usual never done it before ).

[seanc]

Re: Gaurdall G-LCD19B

Ahah, you now have a location showing - you're somewhere near me

So yes, the caps could be causing this problem.
I had a 17" monitor with external 12v PSU, the monitor had gradually taken longer and longer to turn on, then wouldn't turn on at all.

Investigated the PSU - putting out 12v as expected, tested with another just in case - still dead.

Tested ESR of the small 100uf 16v caps, starting nearest the power jack - very high ESR.
There were about 3 caps in parallel there, I changed those 3.
Worked fine afterward

[sabre504]

Re: Gaurdall G-LCD19B

Hi see you were near

well think i might change them all got nothing to lose, but will hold off till tomorrow see if can find anything else with a bit of prodding about.
Not holding out much hope as i think apart from caps have been thro everything apart from the chips

[seanc]

Re: Gaurdall G-LCD19B

Measure the voltage going across the cap above the VGA connector.

[sabre504]

Re: Gaurdall G-LCD19B

Volts across legs 12.23

[sabre504]

Re: Gaurdall G-LCD19B

Should have said
all bigger caps are 16v 100uf
3 small caps 16v 10uf

[seanc]

Re: Gaurdall G-LCD19B

Tried the caps above that, to the left and right of some sort of black component?

[sabre504]

Re: Gaurdall G-LCD19B

Thats a volt reg getting 4.99 on the 5v side and 3.3 on the other

[seanc]

Re: Gaurdall G-LCD19B

All sounds OK to me!

[sabre504]

Re: Gaurdall G-LCD19B

Yes all the volts appear right until you get to 1.8 regs.
So as i say try a change of caps start with the 16v 10uf.
Mind you am eyeing up the guts of my Xerox 19" wondering if i could rig them up in the casing if all else fails