Samsung 215tw display cuts out

[romansroad]

Re: Samsung 215tw display cuts out

arggghhhhhh.

wrong part sent AND worried that the primary gauge is too small. I'll keep trying....

[romansroad]

Re: Samsung 215tw display cuts out

LCDparts.net says they have the transformer. I've ordered it and will post results. If this works, many of the Samsung 215TW's will be revived!

[romansroad]

Re: Samsung 215tw display cuts out

I forgot.

The return wire on our SAmsung only carries about 4 volts, so I bet you can scavange some wire from another power supply that would work. I suspect the issue here is poor durability of the vinyl insulation....that's why I'm using the teflon/silver wire.

[romansroad]

Re: Samsung 215tw display cuts out

it was ccflwarehouse.com . They shipped USPS for $5 and it arrived in 3 days!

Problem is, with the inverter xformer secondary short, it doesn't generate enough voltage to light the 6th lamp, AND the xformer is getting too hot. I too can run it for a while and it stays stable, but suspect the heat will kill the drivers and zot the remainder of the power supply.

Found some inverters on lcdparts.net, but am not sure that merely matching the primary/secondary resistance that I'll get a good match. Worried about impeadance and the feedback loop to the logic board.

No where can i find the "SPI 8T00010" transformer!

[almoodie]

Re: Samsung 215tw display cuts out

[QUOTE=romansroad]New info....

My unit proved to have a bad inverter xformer....after I bought a new CCFL. The secondary resistance was just a tiny bit less than the others (didn't measure impeadance) and it appears the CCFL shorted to the case and I assume, fused a section of the secondary. This xformer runs hot and the tube won't light. Finnally found it with tube/tansformer swaps.

I jury rigged the CCFL wiring using spare wire and laid the whole assembly out on the floor. Plugged together the two boards and connected them to the two banks of CCFLs, and turned it on. Couple of seconds delay and then on came the lamps, and they have stayed on for 15 minutes now. I need sunglasses.
One of the tubes has failed to come on so it will have to be replaced, plus I as I said before I need CCFL return wire to complete the rebuild.

I thought the power supply/inverter would not stay on if a CCFL was not working, but mine is running with one lamp (of three in a bank) out, go figure. Romansroad where did you buy your CCFL?

Al.

[romansroad]

Re: Samsung 215tw display cuts out

New info....

My unit proved to have a bad inverter xformer....after I bought a new CCFL. The secondary resistance was just a tiny bit less than the others (didn't measure impeadance) and it appears the CCFL shorted to the case and I assume, fused a section of the secondary. This xformer runs hot and the tube won't light. Finnally found it with tube/tansformer swaps.

Now.

Where can I find the SPI 8TP00010 xformer???

Does anyone know other poer boards common to this one?

Thanks!

[romansroad]

Re: Samsung 215tw display cuts out

Great pics and timely item. I too have been tracking this identical issue down on the same 215tw. Just installed a factory new CCFL and STILL no go. My symptoms are: normal backlight for <2 secs then all off. Found arcing of one of the CCFL return wires, and disconnected that tube. Then, 5/6 tubes lit fine, but HV xformer to the defective tube ran HOT. Have remove 2 xformers from the circuit to test primary/secondary and all resistances are the same. The HV blue disc caps are OK, and have already replaced the 1000uf filter caps with mil spec units. No shorts/open in return wire, and am wondering if my new CCFL is bad?

I'm actually starting to get tired of this....

As to the wire for your return leads, RadioShack won't have what you need, and there's not much space betwwen the tube holder and the case. I plan on using some mil spec teflon coated silver wire as it has a higher insulation factor but isn't too thick. You could scavange some from dead CRT unit, but I bought my supply on Ebay.

My problem is I don't think it's the tube.... any ideas would be appreciated. I also can't find the power supply schematic for this unit anywhere....anyone have one?

[PlainBill]

Re: Samsung 215tw display cuts out

I need to rewire the return leads to the CCFLs, shown in attached image. I've tried Radio Shack my only local retailer but can find anything of suitable gauge. Can anyone tell me what gauge wire I need and where I might order it, a part number would be of great help.

Al.

Try the places that sell CCFLs. These guys have it, but at outrageous prices. http://www.ccflsurplus.com/hivowiandha.html

PlainBill

[almoodie]

Re: Samsung 215tw display cuts out

I need to rewire the return leads to the CCFLs, shown in attached image. I've tried Radio Shack my only local retailer but can find anything of suitable gauge. Can anyone tell me what gauge wire I need and where I might order it, a part number would be of great help.

Al.

[freelander]

Re: Samsung 215tw display cuts out

Glad to see that you found it. Since you are about to move this to the bone pile, you should consider trimming the end of the lead and re-solder to the tube bank. It certainly isn't an ideal solution but I brought one back to life this way and it's still running.

[almoodie]

Re: Samsung 215tw display cuts out

The Samsung 215TW shares the same Samsung LTM210M2 panel as Gateway FPD2185W and HP F2105 monitors that I have worked on. Based on your problem description, you almost definitely have one or more dead bulbs in your panel. I'm not sure if this model has the -01 or the -02 variation but the only difference is the connector style. Do you have three individual connectors for each bulb bank? I had a troublesome monitor like this that didn't have any obvious signs of blackening etc but when I individually tested the bulbs, one was indeed dead and causing the shutdown. Upon disassembly, I discovered that the reason I couldn't see any obvious issues is because the solder joint on the bulb failed within the rubber sleeve on the end. Quite unusual failure mode but it happened to me with this panel.

By the way, I have never been able to see an image with a functioning power board and dead bulbs with this panel. I'm not sure if there is some kind of film but just an observation.

I didn't notice if you said that you took the known-to-be-working panel and tried it in the recently repaired monitor. Confirm that your repair is good and you know that you have isolated it.

Sorry I posted this mesage to the wrong thread last night!!!!!!!!!!!!
Freelander, you are correct, exactly as you said, one of the solder joints at the end of one of the CCFL tubes had failed, presumably leading to arcing. Images are attached.

For those who have never seen the guts of a panel here goes:

Image 1: Essentially a metal tray with a sheet of white glossy plastic in the bottom. The angled pieces (wires attached) lying to the side each carry 3 CCFL tubes. These angled pieces slot in top and bottom in the tray creating a wall of light

Image 2: One of the two angle pieces which carry the CCFLs

Image 3: A 3/8 inch slab of clear plastic which sits in the main panel tray. On top of this sit 3 layers of plastic sheet (not shown). I guess they are polarizers, diffusers, or the like.

Image 4: The failed CCFL return wiring

Image 5: A bank of 3 CCFL tubes with wiring

Image: 6 Closeup of CCFL ends with charring. White end piece is rubber and broken up somewhat with the charring.

All the pieces are quite robust but I had to get my 17 year old daughter with her small hands to disassemble to CCFLs from the angle pieces. Have to go get some wire fine enough to rewire the CCFLs tomorrow, together with a can of compressed air and a microfiber cloth, the poor man's answer to a clean room.

This is all very interesting but probably an uneconomic exercise. Plus the big question is whether I can put this thing back together in an acceptable state of cleanliness such that I get a usable monitor.

[freelander]

Re: Samsung 215tw display cuts out

The small connector makes it easy to test one connector at a time but you may need to become a little creative with the big one. I have used little pins to make it easy to use aligator clip leads to connect the panel when it is not in place. To verify that you have one or more failed bulbs, you will need to take advantage of your second panel. you can connect disconnect one connector at a time and connect with the similar (known good) connector for a bulb bank in your good monitor. There is a methodical approach here and all that it will do is narrow down your bulbs without removing them yet. Make sure that you power down in between re-arranging your connections and be sure not to short anything out.

You can also remove the larger connector if need be to bare the wire ends. You will notice little tabs that you can push in and very carefully pull the wire out of the connector. Of course, if you can rig something up with what you have on hand without doing that, that works too.

[almoodie]

Re: Samsung 215tw display cuts out

The Samsung 215TW shares the same Samsung LTM210M2 panel as Gateway FPD2185W and HP F2105 monitors that I have worked on. Based on your problem description, you almost definitely have one or more dead bulbs in your panel. I'm not sure if this model has the -01 or the -02 variation but the only difference is the connector style. Do you have three individual connectors for each bulb bank? I had a troublesome monitor like this that didn't have any obvious signs of blackening etc but when I individually tested the bulbs, one was indeed dead and causing the shutdown. Upon disassembly, I discovered that the reason I couldn't see any obvious issues is because the solder joint on the bulb failed within the rubber sleeve on the end. Quite unusual failure mode but it happened to me with this panel.

By the way, I have never been able to see an image with a functioning power board and dead bulbs with this panel. I'm not sure if there is some kind of film but just an observation.

I didn't notice if you said that you took the known-to-be-working panel and tried it in the recently repaired monitor. Confirm that your repair is good and you know that you have isolated it.

The panel is indeed LTM210M2 L02. Only 2 individual connectors per bank, image attached. I will examine the bulbs carefully tomorrow and report back.

[freelander]

Re: Samsung 215tw display cuts out

The Samsung 215TW shares the same Samsung LTM210M2 panel as Gateway FPD2185W and HP F2105 monitors that I have worked on. Based on your problem description, you almost definitely have one or more dead bulbs in your panel. I'm not sure if this model has the -01 or the -02 variation but the only difference is the connector style. Do you have three individual connectors for each bulb bank? I had a troublesome monitor like this that didn't have any obvious signs of blackening etc but when I individually tested the bulbs, one was indeed dead and causing the shutdown. Upon disassembly, I discovered that the reason I couldn't see any obvious issues is because the solder joint on the bulb failed within the rubber sleeve on the end. Quite unusual failure mode but it happened to me with this panel.

By the way, I have never been able to see an image with a functioning power board and dead bulbs with this panel. I'm not sure if there is some kind of film but just an observation.

I didn't notice if you said that you took the known-to-be-working panel and tried it in the recently repaired monitor. Confirm that your repair is good and you know that you have isolated it.

[PlainBill]

Re: Samsung 215tw display cuts out

If I connect power/inverter board to the CCFLs, and to the logic board, but do not connect the logic board to the panel (actually the board fused to he panel), and switch on, I get the same backlight on for two seconds the off.

Why does the power/inverter board shut down the CCFLs?
1) Because the CCFLs show over voltage or over current. Makes sense since the power/inverter board IS connected to the CCFLs. This would mean there is a problem with the CCFLs or associated wiring. Is that correct.
2) OR is the the power/inverter board able to detect that that the logic board is not connected to panel board, and hence can shut down for that reason.

I ask because I can't see and problem with the CCFL lamps, no breaks or blackening, and the wiring shows no faults.

If there is no problem with the CCFLs and their wiring, does that mean their must be a problem with the board fused to the LCD panel.

Help, I'm trying to educate myself.

Assuming I understand how everything works, that is correct. I don't understand what information passes from the panel board back to the logic card, but assuming there is some sort of status information passed that way would account for your observations.

PlainBill

[almoodie]

Re: Samsung 215tw display cuts out

If I connect power/inverter board to the CCFLs, and to the logic board, but do not connect the logic board to the panel (actually the board fused to he panel), and switch on, I get the same backlight on for two seconds the off.

Why does the power/inverter board shut down the CCFLs?
1) Because the CCFLs show over voltage or over current. Makes sense since the power/inverter board IS connected to the CCFLs. This would mean there is a problem with the CCFLs or associated wiring. Is that correct.
2) OR is the the power/inverter board able to detect that that the logic board is not connected to panel board, and hence can shut down for that reason.

I ask because I can't see and problem with the CCFL lamps, no breaks or blackening, and the wiring shows no faults.

If there is no problem with the CCFLs and their wiring, does that mean their must be a problem with the board fused to the LCD panel.

Help, I'm trying to educate myself.

[almoodie]

Re: Samsung 215tw display cuts out

Good job of troubleshooting. I wish more people were that thorough.

As far as taking the LCD panel apart, same advice as before - post pictures. The disassembly process is often non-intuitive. After all, they really aren't designed to be taken apart.

One final point: Given that the logic card seems to be shutting the backlights down, the most likely source of the problem is the LCD panel, not the CCFLs.

PlainBill

I have the screen assembly apart, lots of pieces.
The CCFL tubes look OK as far as I can tell, no breaks or blackening.
I had thought that the screen driver board and the LCD panel would separate but that does not appear to be the case, image attached. If they will not separate then I guess I am out of luck with this LCD panel. I Googled replacement screens but they are priced so high it makes repair uneconomic.
Selling the good boards on Ebay looks the way to go.

Al.

[PlainBill]

Re: Samsung 215tw display cuts out

Images of logic board are attached.

I have another, known-to-be-working, Samsung 215tw, so I took the logic board out and put it in the non-working monitor, results were the same, back light shuts down after a second or so.
Next I put the screen from the non-working monitor in the chassis of the working monitor, so that all components are known to be good with the exception of the screen. Same result, backlight turns on for a second or so then shuts down.
I deduce from this that the screen/backlight of the non-working monitor has a backlight problem.
Do you agree?
I have looked at taking the screen apart to access the CCFL tubes but it is not obvious how it comes apart, any advice.

Al.

Good job of troubleshooting. I wish more people were that thorough.

As far as taking the LCD panel apart, same advice as before - post pictures. The disassembly process is often non-intuitive. After all, they really aren't designed to be taken apart.

One final point: Given that the logic card seems to be shutting the backlights down, the most likely source of the problem is the LCD panel, not the CCFLs.

PlainBill

[almoodie]

Re: Samsung 215tw display cuts out

Post pictures of the logic board. But things aren't looking very good.

PlainBill

Images of logic board are attached.

I have another, known-to-be-working, Samsung 215tw, so I took the logic board out and put it in the non-working monitor, results were the same, back light shuts down after a second or so.
Next I put the screen from the non-working monitor in the chassis of the working monitor, so that all components are known to be good with the exception of the screen. Same result, backlight turns on for a second or so then shuts down.
I deduce from this that the screen/backlight of the non-working monitor has a backlight problem.
Do you agree?
I have looked at taking the screen apart to access the CCFL tubes but it is not obvious how it comes apart, any advice.

Al.

[PlainBill]

Re: Samsung 215tw display cuts out

What can I do now.

Post pictures of the logic board. But things aren't looking very good.

PlainBill