Problem in 5V Fan
Collapse
X
-
Re: Problem in 5V Fan
I can answer that. Check R308. See if you get different voltages at each end of R308. If you aren't getting anything on either side, follow the trace from R308 to pin 76 of U20 IT8512E.
If there's nothing on pin 76 either, then U20 is faulty and must be replaced. But i wouldn't bother with that for a fan... You can easily make a little replacement circuit to enable the fan to still be thermally controlled.
UPDATE :
Mesured voltages on both sides of R308 and I get 0.01V .
On pin76 of IT8512E and I get 0.01V.
Seems that U20 is the faulty component right?
Gonna try to find a new one .
I've also noticed some capacitors that seem weird. Could you guys tell me if they seem blown?
Thanks for your help!Comment
-
-
Re: Problem in 5V Fan
C342 looks like it's just got a bit of dirt or something next to it, but that C346 looks like it might be burnt out if it's not just more dirt.
According to the schematic (Page 71) that C346 looks like it's just part of supply filter for the analog supply to U15, which seems to provide the RAM clock signals and doesn't look like it has anything to do with the fan, though."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
-
Re: Problem in 5V Fan
Hello!
I think the board came with these components in these condition.
She is booting ok, testing OK but cant keep CMOS settings and the fan doesnt spin.
I've found a similar board to this one, one that is dead.
Maybe I can take those capacitors and U20 from the dead one, and swap them.
What do you guys think?
Thanks!Last edited by magneh; 05-05-2014, 05:41 PM.Comment
-
Re: Problem in 5V Fan
Sounds like a plan. Not sure I would bother with the capacitors though, just buy some fresh ones. Trying to solder SMD capacitors etc that already have solder on the terminals is a PITA in my opinion. Plus if you are desoldering and stuffing around with them they could get heat damaged - and you can't be sure the ones you removed are not bad already or even the right value."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
-
Re: Problem in 5V Fan
Sounds like a plan. Not sure I would bother with the capacitors though, just buy some fresh ones. Trying to solder SMD capacitors etc that already have solder on the terminals is a PITA in my opinion. Plus if you are desoldering and stuffing around with them they could get heat damaged - and you can't be sure the ones you removed are not bad already or even the right value.
Not SMD?
Or I should just change U20 and see from there?
Thanks!Comment
-
Re: Problem in 5V Fan
No, if you buy new ones you should buy SMD ones the same.
I just mean re-using SMD ones from an old board is probably a bad idea: no markings, difficult to test, and easy to damage while desoldering."Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
Related Topics
Collapse
-
by theone111I have an LG Plasma TV 60PM6700 for the past ~12 years.
In the last ~3-4 months I have been having some issues.- Problem: It started with random picture disappearing (sound still worked).
Frequency: Happened about once a week.
Solution: Had to turn off TV wait a few seconds before turning it on again. - Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
Frequency: Happened about once a week.
Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve. - Problem: TV shuts down
1 Photo - Problem: It started with random picture disappearing (sound still worked).
-
by kalilinux25DEVICE: Laptop
Model: lenovo thiinkpad t410
Board Id: 09A33-3 48.4FZ09.031
NZM1H-8
ISSUE: NO POWER
From the first mosfet 20v is not passing through, pin 4 has 19.5v and the first mosfet is a P-CHANNEL mosfet (SI7121DN) i think the pin 4 should be lower to active the 1st mosfet to allow the 20v to pass to second mosfet ive check all for shorting in the board , i did;nt find in rails, so ive check the schematic and im suspecting that, my Q61 is faulty due to its pin 1 is 0.47ohms? im not pretty sure, hope someone can help me figure out this issue.
... -
by Zeonalbastai have a problem with thinkpad X1 carbon gen 2 "LMQ-1MB 12298-2 48.4LY26.021"
The laptop was turned off because the MOSFET was not transmitting voltage. After checking it turned out that the gate pin on the MOSFET was the problem, because it was producing an inappropriate voltage. and it was discovered that the problem was with the Think engine, so I decided to reprint each pin, and finally the mosfet could work properly. However, there is another problem, even though the voltage has been supplied to the laptop, it still won't turn on, there isn't even an LED indicator. After double... -
by Gibon378PC Specs:
- CPU: Ryzen 5 1600
- GPU: GTX 1080 Palit JetStream
- MOBO: ASRock ab350 PRO4
- RAM: Crucial Ballistix Sport 2x8GB 3000MHz (XMP 2.0)
- PSU: XFX 650W (don't remember what model)
- OS SSD: ADATA SP920
- OS: Windows 10 21H2
Problem description:
Hi. I have a problem that has been going on for some time (2-3 years). It's hard to explain what it really is. Sometimes, my computer stops playing music, stops videos (starts buffering on youtube), there is no sound in games and when I minimize the game window and return to the game there is a black screen with window borders... -
by perzyk23Good morning,
I have a problem with Lenovo T580, which after error code 0288 suggests a problem with the display. I checked the display and it works on another laptop. I replaced the display cable with a new one. I programmed another BIOS (downloaded from this forum) and I still have the problem of a dead display - there is an image via HDMI, and the system does not detect the built-in LCD at all. The problem appears to be hardware. What can I check to confirm or disprove this? I found many threads on the Internet related to this problem 0288, but without specific solutions. Please advise.... - Loading...
- No more items.
Comment