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Old 09-01-2010, 01:11 PM   #41
retiredcaps
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Default Re: Acer AL1916W

Also, what are the part numbers of

IC201 and IC202 (top side)

U101 and probably U102 (the other legged IC on the bottom side)

edit: And measure the resistance of the inverter transformer pins S1 to S2 and S3 to S4 (in circuit - power OFF and LCD unplugged) as per

http://lcdparts.net/TransformerDetai...ProductID=3360

Both should read around 650 ohms.

Last edited by retiredcaps; 09-01-2010 at 01:16 PM..
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Old 09-01-2010, 01:33 PM   #42
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
The dark green caps are Taicon.

I just finished replacing all the bad caps since I got the new ones today and still no power to the lights. LCD works, image shows up, green power light comes on, just no juice to the lights..
on the back side of the board,Is f200 good?
Al.
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Old 09-01-2010, 02:47 PM   #43
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Default Re: Acer AL1916W

Quote:
Originally Posted by retiredcaps View Post
Also, what are the part numbers of

IC201 and IC202 (top side)

U101 and probably U102 (the other legged IC on the bottom side)

edit: And measure the resistance of the inverter transformer pins S1 to S2 and S3 to S4 (in circuit - power OFF and LCD unplugged) as per

http://lcdparts.net/TransformerDetai...ProductID=3360

Both should read around 650 ohms.
IC201 and 202 have this p/n:
P605
BZ6G1S

U101 and 102 have this p/n:
B U3
PC817

As for measuring resistance of the S1 - S2, and S3 - S4.. How do I know which contacts those are? Mine are not labeled, not sure if they normally are.

F200 looks fine, but I am not sure what a bad one looks like, doesnt seem to have any damamge to it though.
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Old 09-01-2010, 02:50 PM   #44
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Default Re: Acer AL1916W

Edit: Replied too soon before visiting the site! I see which contacts those are -
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Old 09-01-2010, 02:50 PM   #45
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
As for measuring resistance of the S1 - S2, and S3 - S4.. How do I know which contacts those are? Mine are not labeled, not sure if they normally are.

F200 looks fine, but I am not sure what a bad one looks like, doesnt seem to have any damamge to it though.
S1 - S4 are the outside pins of the transformers.

To measure a fuse, put your multimeter on ohms (probably 200 ohms). Put black on one side, red on the other side of F200.

A good fuse should read 0.3 ohms. If it reads "1" or 0L, it is an open fuse (blown).

edit: BTW, that is a good catch on finding F200. I never expected to see a fuse on the bottom side on a board. Normally they are on the front side.
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Old 09-01-2010, 02:54 PM   #46
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Default Re: Acer AL1916W

Meter reads .764k ohm on first and .761k ohm on second....
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Old 09-01-2010, 02:58 PM   #47
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
Meter reads .764k ohm on first and .761k ohm on second....
Are you talking about the transformer? If yes, the transformer is likely good. This test doesn't catch a shorted turn on the transformer, but let's assume it is good for now.
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Old 09-01-2010, 03:54 PM   #48
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Default Re: Acer AL1916W

There was a explanation given for manufactures using the small surface mount fuses. To keep the everyday user from thinking if 2a is good then 4a must be better, I think it was plainBill.
A lot of the delta boards use them .F200 is important to check because it supplies power to the back light controller.
Al.

Last edited by alexanna; 09-01-2010 at 03:58 PM.. Reason: i cat figure out how to quotew
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Old 09-01-2010, 04:02 PM   #49
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Default Re: Acer AL1916W

Quote:
Originally Posted by alexanna View Post
A lot of the delta boards use them .F200 is important to check because it supplies power to the back light controller.
Al.
Still a great catch on spotting F200. I would have looked on the front side PCB forever.

Also for all the newbies and first time posters, this is a good example why clear focused pictures are required. If this were some fuzzy, out of focus, 800x600 pic, we (Al) would have never spotted this fuse.
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Old 09-01-2010, 07:46 PM   #50
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Default Re: Acer AL1916W

You guys are awesome! When I test the F200 fuse should I have it off the board, or will it test properly still soldered on?
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Old 09-01-2010, 07:47 PM   #51
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
You guys are awesome! When I test the F200 fuse should I have it off the board, or will it test properly still soldered on?
In circuit is fine.

edit: report actual ohm reading

Last edited by retiredcaps; 09-01-2010 at 07:52 PM.. Reason: edit: report actual ohm reading
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Old 09-01-2010, 09:07 PM   #52
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Default Re: Acer AL1916W

When I test one direction I get 0L, and the other way continuously climbs from 2.4k Ohm up. Blown fuse? I will replace it tomorrow morning after checking back later with you all.
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Old 09-01-2010, 09:10 PM   #53
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
When I test one direction I get 0L, and the other way continuously climbs from 2.4k Ohm up. Blown fuse? I will replace it tomorrow morning after checking back later with you all.
Yes, blown. It should read 0.3 ohms. If that is the root cause, you can give a big thanks to alexanna. There is no way, I would have seen that fuse. I will remember to look for that in the future though.
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Old 09-02-2010, 04:15 PM   #54
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Default Re: Acer AL1916W

I replaced the fuse and noticed something in the right direction, now when it powers up the lights flash or flicker for a second then shut off..
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Old 09-02-2010, 08:26 PM   #55
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
I replaced the fuse and noticed something in the right direction, now when it powers up the lights flash or flicker for a second then shut off..
You might want to check IC201 and IC202 for shorts. Apparently, this board is prone to one of those chips failing. Replace them in pairs. Part number is AOP605 and available from digikey for under $1.00 each.
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Old 09-02-2010, 09:39 PM   #56
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Default Re: Acer AL1916W

Quote:
Originally Posted by mscott03 View Post
I replaced the fuse and noticed something in the right direction, now when it powers up the lights flash or flicker for a second then shut off..
Dose the fuse remain good,After the flash?
Al
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Old 09-02-2010, 10:48 PM   #57
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Default Re: Acer AL1916W

Quote:
Originally Posted by jetadm123 View Post
You might want to check IC201 and IC202 for shorts. Apparently, this board is prone to one of those chips failing. Replace them in pairs. Part number is AOP605 and available from digikey for under $1.00 each.
Agreed.

You can test for shorted transistors "in circuit" (with power off and unplugged)

a) put black probe (com) on pin 1 and red probe on pin 2 - read ohm
b) put black probe (com) on pin 1 and red probe on pin 3 - read ohm
c) put black probe (com) on pin 2 and red probe on pin 3 - read ohm

If any ohm reading is less than 40 ohm you probably have a shorted transistor and it will need to be replaced. Test it out of circuit to verify.
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Old 09-03-2010, 12:12 AM   #58
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Default Re: Acer AL1916W

Quote:
Originally Posted by retiredcaps View Post
Agreed.

You can test for shorted transistors "in circuit" (with power off and unplugged)

a) put black probe (com) on pin 1 and red probe on pin 2 - read ohm
b) put black probe (com) on pin 1 and red probe on pin 3 - read ohm
c) put black probe (com) on pin 2 and red probe on pin 3 - read ohm

If any ohm reading is less than 40 ohm you probably have a shorted transistor and it will need to be replaced. Test it out of circuit to verify.
the aop605 is in a dip -8 package I have not looked at data sheet but testing is going to be different.
Al.
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Old 09-03-2010, 12:24 AM   #59
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Default Re: Acer AL1916W

Quote:
Originally Posted by alexanna View Post
the aop605 is in a dip -8 package I have not looked at data sheet but testing is going to be different.
Al.
Too much sun today.

You are correct. I'm getting my threads all mixed up (have 7 tabs open right now). Ignore my previous instructions.

edits below:

Datasheet at
http://www.aosmd.com/pdfs/datasheet/AOP605.pdf

Test S1-G1, S1-D1, G1-D1. Note there are 2 D1s.
Test S2-G2, S2-D2, G2-D2. Note there are 2 D2s.

If my math is right at 12:30am, that should be 12 readings.

Last edited by retiredcaps; 09-03-2010 at 12:28 AM..
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Old 09-03-2010, 12:26 AM   #60
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Default Re: Acer AL1916W

I knew i would wake you back up. have a good morning.
Al.

Last edited by alexanna; 09-03-2010 at 12:28 AM..
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