Acer P193w - blink screen

[PlainBill]

Re: Acer P193w - blink screen

I have subst with DAEWOO units.

And what was the result?

PlainBill

[forges]

Re: Acer P193w - blink screen

I have subst with DAEWOO units.

[PlainBill]

Re: Acer P193w - blink screen

Service manual does not see this.
I have 6,89v at primary t501 and 6,89v at primary t502, but only for 2 secs at power on.

Whitout power it has 485 kohm and 482 kohm between the two out of t501 and t502

OK, you have got 'Two seconds to black'. You've established the transformers are likely good; that eliminates one of the probable causes.

Have you tried substituting known good CCFLs? Or hooking up a known good panel?

You stated you replaced a number of capacitors. What brand and series did you use as replacements?

PlainBill

[forges]

Re: Acer P193w - blink screen

Service manual does not see this.
I have 6,89v at primary t501 and 6,89v at primary t502, but only for 2 secs at power on.

Whitout power it has 485 kohm and 482 kohm between the two out of t501 and t502

[PlainBill]

Re: Acer P193w - blink screen

Service manual is at Elektrotanya.

PlainBill

[Rtech]

Re: Acer P193w - blink screen

Well without a cct diagram,its impossible to help, as who knows what D803,D805 etc are,and where they are in the cct,have you got a schematic ?? and if so put it on here,and then hopefully you will get some guidance.

[forges]

Re: Acer P193w - blink screen

I have 14,85v at d803; 5,08v at d805;
I have 14,85v at u502; 6,89v at u501 but in this case variable to 0v-6,89v continuosly.
I have changed 5 caps; 2 of 1000uF, 2 of 470uF and 1 680uF.

[forges]

Re: Acer P193w - blink screen

I have the same problem, but if i connect all 4lamps it blinks if i connect only 3 lamps it still image for 3 secs. then off.

[xtiansy]

Re: Acer P193w - blink screen

hi! i'm new here. i have the same model as this and got the same issue. two ccfls on top are busted. it's hard to get a replacement from where i am.

is there any way i could run this lcd with only 2 bottom ccfls?

i saw an article online about bypassing the feedback.

http://www.bestelectronicarticles.co...ht-system.html

can this be done so i can run it with busted ccfls? if yes, how? i can't find the datasheet of the inverter ic.

btw, i already removed the busted ccfls, replaced the ecaps and reflowed some bad solder.

thanks in advance!

[Rtech]

Re: Acer P193w - blink screen

Well done,glad you are up and running again.

[spintop]

Re: Acer P193w - blink screen

Finally, opened up the panel to reach the CCFL lamps. Replaced the top dual lamp with a new one. Now working great !!! The toughest is to keep dust and fingerprint away from the panel layers, opening and assembly is quite easy.

On the old dual lamp, found that the fault could to due to the browning and rather bad corrision of the wiring near the ends of the lamps, likely from the years of usage at high voltage.

FYI, I believe if I replaced the wiring in the old lamps, they could be re-used. So for those who have difficulty finding replacement lamp, they could try out this method first.

Once again thanks all for the valuable advice !!!

[spintop]

Re: Acer P193w - blink screen

I'm sure lots of members change them where necessary,even though they can be a pain.Example......I got an Acer 1706,Top backlight had failed,went to replace, BUT as heat rises,and this had been used for a good few years,the plastic type connector to the screen had become brittle, and split as soon as it was 'unfolded' to remove it.
In the UK at one time,no doubt you could have taken it to a TV repair shop, and they may have helped,but now those shops are few and far between,due to the rubbish from the Far East we now get,little technical info in some cases, and difficulty with spares,which is why we are becoming a 'throw away' nation, and no doubt other countries are also going or already gone that way.

For one thing this Acer 193w is still looking good even now with just 3 ccfl working. So on one hand don't want to ruin a nice working lcd due to my inexperience in replacing the lamp. On the other hand, just want to fix this one completely.

[Rtech]

Re: Acer P193w - blink screen

I have not decided if i want to do it myself, as the task seems pretty daunting with good chance of damage. Maybe give it to someone who is able to do the job.

wonder anyone here have successfully do a ccfl replace ?

I'm sure lots of members change them where necessary,even though they can be a pain.Example......I got an Acer 1706,Top backlight had failed,went to replace, BUT as heat rises,and this had been used for a good few years,the plastic type connector to the screen had become brittle, and split as soon as it was 'unfolded' to remove it.
In the UK at one time,no doubt you could have taken it to a TV repair shop, and they may have helped,but now those shops are few and far between,due to the rubbish from the Far East we now get,little technical info in some cases, and difficulty with spares,which is why we are becoming a 'throw away' nation, and no doubt other countries are also going or already gone that way.

[retiredcaps]

Re: Acer P193w - blink screen

I've done 2, you have to be real careful the bulbs can break real easy, ccflwarehouse has assemblies you have to know the part # of the panel.

You can also get full assemblies to ease the repair/replacement

http://www.ccflwarehouse.com/cohaccas.html

Obviously, they will cost more than the "bare" ccfl.

[De3rcr]

Re: Acer P193w - blink screen

I've done 2, you have to be real careful the bulbs can break real easy, ccflwarehouse has assemblies you have to know the part # of the panel.

[spintop]

Re: Acer P193w - blink screen

They also have a tutorial on how to install new ones.

http://www.ccflwarehouse.com/lasotu.html

I have not decided if i want to do it myself, as the task seems pretty daunting with good chance of damage. Maybe give it to someone who is able to do the job.

wonder anyone here have successfully do a ccfl replace ?

[retiredcaps]

Re: Acer P193w - blink screen

They also have a tutorial on how to install new ones.

http://www.ccflwarehouse.com/lasotu.html

[Rtech]

Re: Acer P193w - blink screen

If you are in the States,I understand ccfl.warehouse are very highly thought of by people on here.It seems you can phone them and they will get exactly what you need.

[spintop]

Re: Acer P193w - blink screen

You can change them, but the name of the game is ' with great care' as it is easy to damage the screen.Most Forum members will probably say this is the hardest repair to do on monitors.There is a video on Youtube somewhere that shows how to do one,and I'm sure someone can point you to that.GOOD LUCK

do u know what specs is the ccfl ?
where can i order them ?

thanks

[Rtech]

Re: Acer P193w - blink screen

You can change them, but the name of the game is ' with great care' as it is easy to damage the screen.Most Forum members will probably say this is the hardest repair to do on monitors.There is a video on Youtube somewhere that shows how to do one,and I'm sure someone can point you to that.GOOD LUCK