I was recapping some Chaintech Apogee board but probably due to some bad soldering near memory regulators something burned as soon as I turned it on. I identified it was probably coming from an rt9173 chip which is voltage regulator. I measured the VOUT pin and it reads 0,7 V only - too low for memory. The boards beeps as it detects no memory - so I guess it really is this chip?
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Less jewellery, more gold into electrotech industry!
Half of the computer problems is caused by bad contacts 
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Re: Board do not start - burned voltage regulator?
Replace mosfet -
Re: Board do not start - burned voltage regulator?
I of course measured them, but they did not seem shorted. Also the board was more heated around the regulator than mosfets.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Re: Board do not start - burned voltage regulator?
mosfets may also fail open
Well. It might be the regulator's fault after all.Comment
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Re: Board do not start - burned voltage regulator?
like they always say, do not try to fix when it is not broken. try different working RAM first that the board supports ...Comment
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Re: Board do not start - burned voltage regulator?
Why do you think RT9173 is for RAM power?
Did you trace the circuit?
There are other RAM related voltages that are less than the power voltage.
I'm just saying check to see what it powers.............Mann-Made Global Warming.
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Re: Board do not start - burned voltage regulator?
what is it look like? i mean the regulator you are saying. isnt it that Mosfets are also regulators?Comment
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Re: Board do not start - burned voltage regulator?
MOSFETs regulate by switching.
The switching is controlled by an IC chip [or chips.].
Those IC chips have regulators to control their voltages that are not MOSFETs.
THOSE regulators can be just a transistor or yet another IC chip.
One popular type [on mobos] is called an LDO regualtor. {Low Drop Out}
If the power regulator to the IC chip that controls the MOSFET is screwed up then so can be the output of the MOSFET.
LDOs are also used to power IC chips that have nothing to do with MOSFETs.
There is usually at least one regulating any IC chip and there's usually a cluster of them around the chipset.
Does your head hurt yet?
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.Last edited by PCBONEZ; 04-15-2011, 02:58 PM.Mann-Made Global Warming.
- We should be more concerned about the Intellectual Climate.
-
Be who you are and say what you feel, because those who mind don't matter and those who matter don't mind.
- Dr Seuss
-
You can teach a man to fish and feed him for life, but if he can't handle sushi you must also teach him to cook.
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Comment
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Re: Board do not start - burned voltage regulator?
I did not trace it precisely, but it's closest to RAM and also as I said, the RAM's are getting much lower votlage than they should (I meassured actually) so they are not able to start and board thinks there are no modules at all.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Re: Board do not start - burned voltage regulator?
Changed the regulator, ther was indeed also one MOSFET burned. Changed it for some from the dead ASUS board I asked about in next thread - it had the same or superior values and same RdsON (14 mΩ). Now the boards runs, just memory shows indefinite amount of errors in Memtest86+. Will try to solder it better and also newrer version of the program.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Re: Board do not start - burned voltage regulator?
The original MOSFET was IRL3175S, I used one 9918H.
It looks loke the regulator heats up more than what I consider to be cool, but I can still keep my finger on so it's not so bad.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Re: Board do not start - burned voltage regulator?
Resoldered all legs once again. Also tried to measure voltage on small ceramics on memory module, it shows some 2,64 V which is fine for DDR. Memtest86+ v4.10 now running, so lets hope
ADD// no error so far, first pass almost done.Last edited by Behemot; 05-31-2011, 01:38 PM.Less jewellery, more gold into electrotech industry! Half of the computer problems is caused by bad contacts
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Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic... -
Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
Assuming... -
This Concept 2 rower pm5 monitor doesn't shut down. It keeps turning on and stays on after being turned off. I read on another forum by another user that replaced the same component to check the voltage regulator.
The monitor should pull around 35mA when turned on and in shutdown it should drops to around 0.060mA. Any advice on finding the voltage regulator on this board to check if it needs to be replaced?
11-05-2024, 07:38 AM -
hello ,for diy voltage injector for short killer/finder -- is it possible to use something like this - LM317 DC Linear Regulator, DC-DC 4.5~40V Turn 1.2~37V, Step Down Power Module, Adjustable
and ampere controller along (to make it zero amps ) with some addons(transistors diodes etc.) for it -- and use some 5v adaptor or 3.3v volt rail of my smps power supply as input and finally get 1v and zero amps for injecting voltage to find out short circuit component ? ..
for source input -- can we use 3.3 -4 volt 18550 battery ?( i have some of those ) and then adding ampere regulator... -
All left and right refers to looking from rear of TV (or looking from front with TV upside down)- TV came with vertical bars and no image. Found faulty TVS on left buffer board. Also replaced T-Con (may have damaged the original while hot air removing components, board has slight warp) and have full image but few horizontal lines on the screen. Some of the lines appears to be 2 pixel tall while others are 1 pixel tall.
- Disconnecting left and right buffer board potentially reveals problems on both sides with different signals (unless this T-Con require jumper like Samsung FB_TRDY1&3) Fault
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