Proview PL926Wbi 19" LCD no picture

[chuck567]

Re: Proview PL926Wbi 19" LCD no picture

LOL! Yeah it sucks when a bulb blows right in the middle of something.
Anyways my brother lives about 45 minutes away so I didn't go all the way over there just to take his monitor a part again, so I decided to do a visual on the backlights to see if I could see anything physical. The short answer is I would like to apologize for not heeding the advise of earlier posters that suggested the backlights being the problem. When I took the top light off they were actually burnt in off at one end the bottom ones while not as bad I could see a hairline crack on one at the end. So it looks like the backlights may in fact be the problem. Again I apologize as I can be extremely anal and dismiss good ideas, a mistake that I shall not make again.

Does anyone know where I can get some new backlights?

Thanks
Chuck

[Krankshaft]

Re: Proview PL926Wbi 19" LCD no picture

You will need to measure the diameter of the tubes and the total length.

This site sells them:

http://www.ccfldirect.com/ccfls.html

I'm sure typing CCFL lamps on google will yield more results as well.

[chuck567]

Re: Proview PL926Wbi 19" LCD no picture

Apparently these are an odd ball size or something, 2mm x 417mm, I suppose my micrometer may be a little off though because I can't find anything close to this length in 2mm. Closest thing I can find is 2.6mm! Think it would pose a problem if I use the 2.6mm It looks like I would have the room.

[Falseadress]

Re: Proview PL926Wbi 19" LCD no picture

Hey guys,
I got a ProView PL926FW
Google didn't provide any help with this one. I just ripped it apart and i saw 4 x 470uf Capcitors dead and 1 220uf Capcitor dead. Theese are samxon capacitors. It probally died because of the heat.I repalced it with 85c ones because i ran out of the 105c ones. It worked perfectly fine. I don't know if hardware are similar but they look similar on the outside. Just less connectors?

[Krankshaft]

Re: Proview PL926Wbi 19" LCD no picture

If they were Samxon caps they probably were GF series Samxon is a known good brand but that series was one of their bad apples.

Like Nichicon's HM series screwup in 2004. They sent a bunch of 360s to their grave.

Now even after Nichicon cleared up the problem the 360s now use Rubycons .

I would be careful with 85 C caps it gets pretty toasty inside LCD inverters and I wouldn't be suprised if they bulged too in time.

Most likely the caps you replaced the old ones with were General Purpose caps.

The caps that should be in there are low ESR caps.

From my experience I have never seen a Low ESR cap rated at 85 C.

I personally use Panasonic FCs for inverter recaps.

[kc8adu]

Re: Proview PL926Wbi 19" LCD no picture

i just recapped a gateway 21" widescreen that was full of samxon gf.
every one of em bad.even the small ones in the primary.
late 06 date on the unit.
agreed 85c caps are likely general pupose and will not last here.
at least you know it works and is worth a parts order to badcaps or digikey.

[arneson]

Re: Proview PL926Wbi 19" LCD no picture

I've been gone some time and want to ask about the samxon caps.
The gf's are suspect, assumed bad?

[kc8adu]

Re: Proview PL926Wbi 19" LCD no picture

I've been gone some time and want to ask about the samxon caps.
The gf's are suspect, assumed bad?

yep.
pure junk.

[bLampert]

Re: Proview PL926Wbi 19" LCD no picture

I know this was posted last year but I gotta give it a shot. like chuck567, I have the exact same monitor with the same problem kinda. When i plug the monitor in the comp. It turns on for like 3-4 sec. then goes blank. While its on the whole screen is a light pink tint. From other forums, some think its the bulbs and some think its the caps. Right now I have everything completely apart. (I can take pics if needed) I'm not sure where to start. You people are saying its the caps but how can I tell if the caps are bad or not? I also did find a site where i can buy the bulbs if needed. Hope someone reads this soon. Thanks!!

-Bill
bLampert@gmail.com

[Bobdee]

Re: Proview PL926Wbi 19" LCD no picture

I know this was posted last year but I gotta give it a shot. like chuck567, I have the exact same monitor with the same problem kinda. When i plug the monitor in the comp. It turns on for like 3-4 sec. then goes blank. While its on the whole screen is a light pink tint. From other forums, some think its the bulbs and some think its the caps. Right now I have everything completely apart. (I can take pics if needed) I'm not sure where to start. You people are saying its the caps but how can I tell if the caps are bad or not? I also did find a site where i can buy the bulbs if needed. Hope someone reads this soon. Thanks!!

-Bill
bLampert@gmail.com

From what you posted that sounds like faulty CCFLs for sure
Can you get another backlight unit that works to connect to Inverter to see if they stay on, also there is a kit for testing backlights, info is on the forum, someone will give you info on that as I have never used one
bob

[Bobdee]

Re: Proview PL926Wbi 19" LCD no picture

Found info on kit, go to this link
https://www.badcaps.net/forum/showth...&highlight=kit

read postings numbers 24 through to 42
bob

can I take it that when monitor comes on for seconds that you do get image???

[Krankshaft]

Re: Proview PL926Wbi 19" LCD no picture

CCFLs emitting pink or red hue is a sign that they have reached the end of their useful life.

An external test of the backlights would confirm this as Bob said. Since you want to make sure the inverter is driving the CCFLs properly.

If the lights are shot it probably is the inverter protection kicking in due to the bad backlights.

Replacing CCFLs is delicate work and you don't want to rip into your panel if you don't have to.

[EGuevarae]

Re: Proview PL926Wbi 19" LCD no picture

CCFLs emitting pink or red hue is a sign that they have reached the end of their useful life.

An external test of the backlights would confirm this as Bob said. Since you want to make sure the inverter is driving the CCFLs properly.

If the lights are shot it probably is the inverter protection kicking in due to the bad backlights.

Replacing CCFLs is delicate work and you don't want to rip into your panel if you don't have to.

I've seen this on several units of this model, and on almost every Polaroid TLA-XXXXX LCD TV I had come to check (except one). The red/pink hue indicates one of the lamps is dying.

[bLampert]

Re: Proview PL926Wbi 19" LCD no picture

Wow guys, thanks for all the responses. I'm very delicate when taking apart monitors. I've fixed some in the past with known bad caps and soldered them myself and poof, works! but this is my first encounter with bulbs. I'm at the point where I have the brackets off the edges of the LCD and seeing the bulbs itself. I was seeing if I could buy some locally but store such as Menards, Ace Hardware etc... didn't have them. So I guess I gotta purchase some from online. I see that each bulb ranges from about $6 and up. Does anyone know a good, cheap site I can buy some off of? I figured out the size I need is 2.6mm(D) x 414mm(L) bulbs. Again thanks for all the help your offering, i'll be sure to...."pay it forward" (haha)

-Bill

[Bobdee]

Re: Proview PL926Wbi 19" LCD no picture

Does anyone know a good, cheap site I can buy some off of? I figured out the size I need is 2.6mm(D) x 414mm(L) bulbs. Again thanks for all the help your offering, i'll be sure to...."pay it forward" (haha)

-Bill

Hello Bill
Read this thread it will help you with your task also a couple of links in there as to where to buy CCFLs, should help
bob

[xtraelectronics]

Re: Proview PL926Wbi 19" LCD no picture

I've got a 22" Proview (2200W) on the bench, it would stay lit for 10 seconds, then go black. (With a pink tint when lit). Connected my "test ccfl's" and they stay lit indefinately. The top ccfl inverter was running hot, (dark spot on the PCB around the driver MOSFET). Caps test ok. Too much current draw from the top ccfl. I then left the tester on the bottom inverter and connected the original (top) 22" tube, same thing, 10 secs to black. Then dismantled the screen assy and found the top ccfl was black on the end, so it is def. bad. Now looking for new/good used ccfl's.

[EGuevarae]

Re: Proview PL926Wbi 19" LCD no picture

Then dismantled the screen assy and found the top ccfl was black on the end, so it is def. bad. Now looking for new/good used ccfl's.

Not necessarily. Do you have a spare CCFL?