11.5 volts on the 12 volt rail is probably ok. Is there anything else hanging off the 24 volt rail on the PSU end? Did you check the 24 volt output at the power supply? If the power supply isnt putting out 24 volts, I'd be looking for a fuse, it might not look 'fuse' like, but will probably be marked F1 or F2 etc on the board. Next up, check the diode on the 24 volt rail on the psu see if its shorted or open. Cant think of anything else atm, but if ya dont get it going in the next coupla days, Ill bring over some special goodies to test it with.
I have some spare inverters as well.
"If a clutered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign." Albert Einstein
Well, I have the cluttered desk, I guess that's a start!
05-11-2012, 08:38 PM (This post was last modified: 05-11-2012, 08:42 PM by cOOter.)
(05-11-2012, 08:28 PM)Thunderbird link Wrote: 11.5 volts on the 12 volt rail is probably ok. Is there anything else hanging off the 24 volt rail on the PSU end? Did you check the 24 volt output at the power supply? If the power supply isnt putting out 24 volts, I'd be looking for a fuse, it might not look 'fuse' like, but will probably be marked F1 or F2 etc on the board. Next up, check the diode on the 24 volt rail on the psu see if its shorted or open. Cant think of anything else atm, but if ya dont get it going in the next coupla days, Ill bring over some special goodies to test it with.
I have some spare inverters as well.
Special goodies are good
The fuse at the 240v in is good.
The second fuse in the center of the board is good. TV wont start without it.
All cables have been unplugged and replugged to make sure connections are jiggy.
I'm out of the shed now (bloody mozzies) otherwise I'd pull the power board back off and have another look at the solder joints on the boards under side.
19-11-2012, 04:12 PM (This post was last modified: 22-11-2012, 03:24 PM by cOOter.)
UPDATE: The thing has been sitting in the shed pulled apart all week.
I was about to order a new back light inverter for $55 delivered from the US, but I thought, have one more looksie cOOter.
It helps to make sure all 16x back light CCLF tubes are in their socket holders.
If only one is disconnected, none will fire up.
Tube #5 wasn't in it's holder, thus the high reading on #5 the other day.
Yeap, so I pulled transformers off the back light inventor board for no reason.
OK, it's working now - I guess my re-soldering passed.
Chopper was a great help as well going over everything with his yoyo. No broken strings
It still might be a bit dicky on cold starts with a slight blink.
Brother Darren was using a power drill in the shed behind me today, and the 200 watt TV would go blank as if the PCB wasn't getting enough power. (we share the same 240v 10amp extension lead from the house 20 meters away)
Not sure about that yet.
Now it's back down stairs on the test bed. (oldies living room TV stand)
Good to hear that its working once again. I have no luck finding a service manual or circuit. Only other thing I can think of is to try each tube out with a CCFL tester, an old laptop inverter might do the trick, and I have seen someone use the base of one of those compact flouros as a tester, pretty dangerous though, just how we like it
"If a clutered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign." Albert Einstein
Well, I have the cluttered desk, I guess that's a start!
Cool, yep Ive swapped the tubes out from one to another, they seem much the same as long as they physically fit, in fact Ive grafted a 17 inch one into a little 15 inch hd tellie in the skunkworks, it pokes out the sides a bit...
"If a clutered desk is a sign of a cluttered mind, of what, then, is an empty desk a sign." Albert Einstein
Well, I have the cluttered desk, I guess that's a start!
22-11-2012, 10:43 AM (This post was last modified: 22-11-2012, 03:27 PM by cOOter.)
(19-11-2012, 07:52 PM)Thunderbird link Wrote: Cool, yep Ive swapped the tubes out from one to another, they seem much the same as long as they physically fit, in fact Ive grafted a 17 inch one into a little 15 inch hd tellie in the skunkworks, it pokes out the sides a bit...
Marget that The color produced varies in some as well.
The other TV is still working now after a few days of use. I must'a fucked up somewhere for it to be working
The color produced varies in some as well.
