Re: 2 Seconds to Black - Gateway LE1936
New transformers came in and the monitor is back in business! (I have to admit I have 2 screws left over).
Thank you for all of your help and the education!
tpearsall
Member
Last Activity: 12-23-2022, 02:57 PM
Joined: 11-09-2012
Location: Ellicott City, MD
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Re: 2 Seconds to Black - Gateway LE1936
Makes sense. Thanks for your help, this has been a HUGE learning experience. I'll report back after the new transformers go in.
Thanks!...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I bought a T5 4w but didn't use it. Before soldering/un-soldering all the connectors I did the "Alternatively, if you do not have a spare CCFL, then try this test." and tried each CCFL individually. When one did not light and one was dim on T501 I repeated the test putting those CCFLs on T502 and they where bright. In all cases they only light up for the 2 seconds. I didn't test with the test light, since everything out of T501 was bad.
To test the CCFLs for leakage resistance do I need to test at the legs...Last edited by tpearsall; 11-10-2012, 11:38 PM.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I tested the CCFLs by plugging them into the inverter board one at a time. The CCFLs in T502 where bright. In T501, one did not light and other was dim. Next I plugged the "good" CCFLs from T502 into T501 they were dim/off and the CCFLs previously in T501 were bright in T502.
Is it save to assume CCFLs are probably good and T501 is bad and I should replace them both or is further testing needed?
T501
1 to 5: .5ohms
3 to 6: .5ohms
7 to 8: 679ohms
Rest were open...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I had 3 CCFLs and the 1 test lamp connected. They all went on for 2 seconds then off. I didn't try the test lamp in place of each CCFL before I pulled the transformers which i think is what I was supposed to test.
Soldering the transformers back in to test all in 4 CCFLs spots.
Thanks!...Last edited by tpearsall; 11-10-2012, 10:16 PM.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
That sure looks like it. Thanks!...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I had a tough time getting a decent picture.
Shoot! I only tested one lamp port port and it went on for the same 2 seconds and off as the display. After a closer read of the test instructions I should have tried it in each location. Should I solder the transformers back in and use the test lamp in place of each CCFL?
Thanks!...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I'm been searching and can't find this transformer and don't know how to determine an equivalent.
It's a bit blurred, but the tops appear to say:
SP?-068 Rohs
LSE K12AH
Any ideas?
Thanks....Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I desoldered the transformers and they bot tested as follows;
T501
1 to 5: .5ohms
3 to 6: .5ohms
7 to 8: 679ohms
Rest were open
T502
1 to 5: .5ohms
3 to 6: .5ohms
7 to 8: 623ohms
Rest were open
Are one or both bad since the difference is > 3%
Thanks,
Todd...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
These should be better. The 3rd image is a close up of a mark near one of the transformers.
Thanks!...Last edited by tpearsall; 11-10-2012, 02:24 PM.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Here is the capacitor pack I installed from [URL="http://lcdalternatives.com/Repair-Kit-Gateway-LE1936-LCD-Monitor-Capacitors-P2038313.aspx"]LCD Alternatives[/URL].Re: 2 Seconds to Black - Gateway LE1936
Here is the capacitor pack I installed from [URL="http://lcdalternatives.com/Repair-Kit-Gateway-LE1936-LCD-Monitor-Capacitors-P2038313.aspx"]LCD Alternatives[/URL].Re: 2 Seconds to Black - Gateway LE1936
Here is the capacitor pack I installed...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Not sure if it's relevant ,but correction on symptoms. Power on the display, power light turns blue, shows the screen for about 2 seconds, goes dark 2 seconds, screen back on 2 seconds, screen off, power light turns amber. With a flashlight you can see that it is still on.
Tested CCFLs with the T5 4w bulb and it lights up just like the display, 2 seconds on, 2 off, 2 on then off.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
I think this is the transformer, but in case I am wrong and it's the power supply inverter......Last edited by tpearsall; 11-10-2012, 01:50 AM.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Top Voltage regulator from previous picture:
LD117A
L18ATC
{no 3rd line}
Pin 1 - 0
Pin 2 - 1.78
Pin 3 - 5.09
2nd Voltage regulator
A1
AS117L-33
B0512
Pin 1 - 0
Pin 2 - 3.25
Pin 3 - 5.09...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Didn't work for me either
. I'll pick up a T5 4w tomorrow.
Attached are what I *think* is the power supply-inverted frond and bottom.
Thanks for all the help!...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Would this work?...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Thanks for the fast response!
200K, not 200 Ohms. When I set to 200 I get Over Range (1 on the left side of screen).
Darn! I thought I was on to something
All over it!
I'll need to research which components they are and how to test them.
I'll pull them out next. Thanks!...Last edited by tpearsall; 11-10-2012, 12:52 AM.Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Sorry for all of the post/pictures, but since this is new to me step by step of what I've done seemed safest. Not sure what to do next?
1) Replace logic board capacitors?
2) Did I miss any transistors to test?
3) Test the MOSFETS? From an internet search I don't see which things on these boards are MOSFETS so direction would be great.
4) I tested the one obvious fuse on the power board and it reported 0 Ohms. Are there other fuses I need to test?
5) Replace rattling thing and scorched capacitor?...Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Not sure what that is circled, but should it rattle? Also, the bottom side if it looks a bit fried. In fact so does the bottom of the capacitor a little higher up on the board....Leave a comment:
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Re: 2 Seconds to Black - Gateway LE1936
Next I moved on to Step 2 - Shorted Transistors. I tested what I *think* are the transistors.
In the picture the top most one circled was:
1 - 2 = 1.0
1 - 3 = 29.7
2 - 3 = 30.9
Other circled:
1 - 2 = 0.8
1 - 3 = 29.8
2 - 3 = 30.7
Questions:
1) Did I test the right things?
2) Did I miss any?
3) The instructions say anything below 20 Ohms is a bad transistor so are both of mine bad?...Leave a comment:
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