Starlogic HD20W

[PlainBill]

Re: Starlogic HD20W

Got my new CCFL today. Replaced the center CCFL, and its the same symtoms....2 seconds to black....and after a few times of off and on with the power supply now its about 1/2 second to black. Maybe both lamps on that section of the inverter?

D122 which is the section where the replacement lamp is, is still measuring 1.3-1.6 volts during the brief flash of the lamps.....

Plainbill, you have any more insights? This is driving me nuts!! If I get this fixed I'm going to throw a celebration party to regrow some of my hair!!!

The only insights I can come up with is an open somewhere between D122 and the point the return line is connected to ground.

PlainBill

[bsweasel]

Re: Starlogic HD20W

But what is the chance of that open being on both sides of the board? when I move those lamps to the other side of the inverter to the D120 section, the higher voltage problem stays with the lamps. Wouldn't that tell us its both the lamps? Or is it possible we are barking up the entire wrong tree?

[PlainBill]

Re: Starlogic HD20W

But what is the chance of that open being on both sides of the board? when I move those lamps to the other side of the inverter to the D120 section, the higher voltage problem stays with the lamps. Wouldn't that tell us its both the lamps? Or is it possible we are barking up the entire wrong tree?

There are several possibilities.

1. Either the new lamp is defective, or a mistake was made while installing it.

2. There is a problem on the board. You have three transformers driving 6 lamps. At least one of them must drive lamps at both ends of the board.

I'd rather suggest that there is a bad solder joint on the board than that you somehow failed to connect the new lamp properly. With all the hard work you've put in on this saying "Hey, you must not know how to solder, or are so clumsy you broke the lamp" sounds very harsh. I'd rather reserve my rudeness for people who deserve it.

PlainBill

[bsweasel]

Re: Starlogic HD20W

There are several possibilities.

1. Either the new lamp is defective, or a mistake was made while installing it.

2. There is a problem on the board. You have three transformers driving 6 lamps. At least one of them must drive lamps at both ends of the board.

I'd rather suggest that there is a bad solder joint on the board than that you somehow failed to connect the new lamp properly. With all the hard work you've put in on this saying "Hey, you must not know how to solder, or are so clumsy you broke the lamp" sounds very harsh. I'd rather reserve my rudeness for people who deserve it.

PlainBill

My soldering is not all the great, that is for sure....but I'm thinking I didn't break it....

You are right...the one transformer drives 2 lamps that have white wires and are in circuit with the D121... Since it has different connectors I wasn't able to easily swap lamps around to see if the voltage changed on that part of the board, but it was similar to the other voltage so I ignored.

So I'm back to my original idea. There are 2 lamp powered by D122 and related inverter. I replaced the one lamp with the blue wire because it appeared to not light so well during the 2seconds to black. Now when it lights it looks MUCH brighter than its brother that is also powered by the same inverter. Swapping these 2 lamps, the one new and the one old, to the other side of the board yeilds similar results when measuring D120. I think I either had 2 bad lamps. (now down to one bad lamp since I replaced one) or both sides of the board have the same bad solder joint problem. But that doesn't seem logical when swapping sides put the voltage readings similar to the 3rd set of lamps. Make sense???

[PlainBill]

Re: Starlogic HD20W

My soldering is not all the great, that is for sure....but I'm thinking I didn't break it....

You are right...the one transformer drives 2 lamps that have white wires and are in circuit with the D121... Since it has different connectors I wasn't able to easily swap lamps around to see if the voltage changed on that part of the board, but it was similar to the other voltage so I ignored.

So I'm back to my original idea. There are 2 lamp powered by D122 and related inverter. I replaced the one lamp with the blue wire because it appeared to not light so well during the 2seconds to black. Now when it lights it looks MUCH brighter than its brother that is also powered by the same inverter. Swapping these 2 lamps, the one new and the one old, to the other side of the board yeilds similar results when measuring D120. I think I either had 2 bad lamps. (now down to one bad lamp since I replaced one) or both sides of the board have the same bad solder joint problem. But that doesn't seem logical when swapping sides put the voltage readings similar to the 3rd set of lamps. Make sense???

Sort of. But my brain isn't working well today.

PlainBill

[bsweasel]

Re: Starlogic HD20W

Well.....2nd lamp soldered in and still not lighting up. What to do now......I'm thinking 12 gauge.....shotgun!!!

[bsweasel]

Re: Starlogic HD20W

I'm about ready to pull all the new lamps, and throw it in the dumpster. Its been weeks since I looked at it and its bumming be out. I'm lost.... logic says its the lamps, but I obviously I'm wrong......

[retiredcaps]

Re: Starlogic HD20W

[QUOTE=bsweasel;118900throw it in the dumpster.[/QUOTE]

May I suggest you post it on your local kijiji or craigslist. Someone else might be able to use your parts.

[hoadle]

Re: Starlogic HD20W

I work some old 20 inch Dell & Nec + gateway LCD monitor, inverter board had 3 set quickdisconnect for 6 CCFl backlight, on normal condition 2 CCFL outside on top & bottom will on & one on mid is backup (that mean one CCFL backlight out both mid backlight on top & bottom will turn on)
I think you problem is inverter board had:
1/ bad cap (most time small cap will blow at bottom) replace all cap
2/ make sure check fuse F101 & F102 if one blowed will not turn on top or bottom backlight & will auto shut off
3/ bad transformer take close look see some burned
If you want quick fix google inverter # or LCd monitor model# & parts or ebay or
http://www.shopjimmy.com/
good luck