Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Hi Toasty-
After seeing vuk1980's numbers, I rechecked the resistance between DS1 banded end and U3 pin 5. I got a reading of 10.2 ohms.
Are there any tests that I can do on RT9202? I'm itching to try out the scope,if applicable. If not, should I just buy a replacement?
BTW vuk1980, I'm in Chicago
badaxe
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Last Activity: 04-09-2010, 07:12 AM
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
With D2 back, here are the voltages corresponding to the numbers on the picture you attached:
1: 5.12v
2: 0v
3: 0v
4: 0vLeave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Thanks Guys!
I checked RA1 on the board and it reads 10.6 ohms. Is this another instance where I should be removing it first? With learning being the goal here, is there a pattern or things to look for when it comes to determining if a components needs to be removed from the board for the test to be accurate?
Based on the comments above, I agree that D2 is OK.
Are there any additional pictures which could help?Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
I'm having much difficulty tracing the path to the first IC. I'm not really sure what I'm looking for, and for that matter, most likely don't fully comprehend how to use my DMM to determine if a component is faulty. Should I be pulling any component that needs to be tested off the board?
I did pull diode D2 off the board it tested it on the diode setting of my DMM. It now reads 153mV. Why does that reading differ from when it was on the board?
I've attached a closeup picture of...Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Checked the voltage from DS1 to U3 Pin 5 and it was 5.11v. Isn't that a good thing? What other tests should be performed to determine if U3 is bad?
I scoured over the board with a magnifying glass and wasn't able to find anything that looked burnt or bubbled.
It might not be relevant, which is why i didn't mention it before, but I have access to a 100MHZ oscilloscope. Keep in mind that I've only turned it on an connected it to a signal generator. I only mention it there may be...Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Hey all, thanks again for all the help and support!
Here is what I found:
With PSU plugged in I get 5.11V across DS1
I wasn't even aware of the diode test setting on my DMM until tonight so please forgive me for not understanding these measurements. I'll see what I can drum up on google later to beter understand what they mean.
With DMM on diode setting:
Red probe on banded side
DS1 - 187 mV
D1 - 1300 mV
D2 - 0 mV
...Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Thanks for all the help guys! I know I'm a pain being such a newbie and all.
Here is what I checked:
markings on U3 :
RT9202
CS5BM1
Resistance between DS1 banded side and pin 5 of U3 = 10100 ohms
U16: Markings:
7705AC
31M
D3EC
It doesn't look or smell burnt to me,but honestly I don't know what a burnt chip looks like.
I'm not sure if this is odd or not, but I found .3 ohms of resistance, regardless...Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
I wasn't able to determine anything from the sniff test. Maybe my sniffer isn't keen enough
I'll do the suggested checks tonight and report back. One question, how do I check the TI TL7705 chip with a DMM?Leave a comment:
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Re: Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
I checked and confirmed that the polarity on the wrong PSU is correct - the center pole is positive.
I read some of the posts above. How would I go about testing to determine if a critical IC is toast?
More pics attached......Leave a comment:
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Incorrect voltage (wrong PSU) used on Linksys WRT-54g router. Help!
Hello, and thank you in advance for your help!
First, let me mention that I'm very new to electronics. I want to learn and I hope I've come to the correct place to ask questions in hopes of doing just that.
So here is my issue. I received a Linksys wrt-54g v1 wireless router from a friend when he upgraded. Unfortunately it was missing the power supply and I mistakenly plugged in a 12V 2amp power supply instead of the correct one, a 5v 2amp PSU. After I plugged in the wrong PSU, I smelled the magic smoke and immediately unplugged it. Using the correct power supply...
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