When turned on, it turns on and off quickly 3/4 times, I only see flashes of light on the display, after which win starts normally, I reprogrammed the bios to the latest version, but it didn't solve it. Thank you
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Re: Hp 250 g7
Remove all power. Meter in resistance mode. Check the resistance to ground of each large coil. Review any low resistance to ground as there may be a shorted cap on that local power supply.
Link or post a schematic for this logic board, if available. Have not searched for one yet. Post any silk screen markings of your logic board. -
Re: Hp 250 g7
Seems like RTC fault. Check RTCRST# and SRTCRST# .Comment
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Re: Hp 250 g7
Sorry I'm not very expert what should I check specifically?Comment
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Re: Hp 250 g7
I've already suggested what to measure. If you dont know how to find out these points on mb, really i cant help.
You didnt mentioned even mb markings. Is it LA-J951P or LA-G07XX board?? In both the cases, cmos is built in the backup battery. So make sure you connect this backup battery and then insert adapter, to power it on.
If the backup battery is defective/discharged fully-then also it'll start 3-4 times before you get display.Comment
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Re: Hp 250 g7
Greetings. the mb is GPI 52 LA-J951P rev. 1.0, the battery works and I also tried with another working battery, it has exactly the defect you said that it restarts 3/4 times every time it is turned on before setting off, I made a measurement, I don't know if it was useful, put the tester tip on the pin 8 of the eprom xmcq128aigh is the other tip on a ground I don't see 3.3v there should be? Thanks 1000.Comment
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Re: Hp 250 g7
You are heading in the wrong direction. Bios pin8 will have 3.3V only after turning on.Your problem is not there as you are getting display though after 3-4 restart.
The first line of suspect is RTC circuit as suggested earlier. They are located near to SOC. Look for JCMOS or ME1 jumper point on mb.
Most of the newer mb dont have free schematic and even if schematic is available, boardview is hardly available. So you need to find out the relevant circuit by tracing with a multimeter and little bit of experience.
RTCRST# & SRTCRST# has 20K resistors and 1-2 caps neraby. SO look for something similar near SOC on your board.Comment
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Re: Hp 250 g7
I found photos and diagram, could you tell me checks to do, sorry but I'm a beginner. Thanks a lotAttached FilesComment
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Re: Hp 250 g7
Now measure these 2 pads(as highlighted by@lapfix)
01.With battery only
02.With adapter onlyComment
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Hi guys, i was wondering, i've got 9Ohms on Vmem, one of the mosfet was shortet to ground, so i've desoldered hi and low mosfets nad still low res, then i removed all of the memory chips, and the resistance is still low, so did you had maybe a card with that low res on memories, and the card was working fine ?
Removed the U1866Q and still without result, i dont have thermal cam so can't see where is hot spot when incjeting voltage.
The resistance on core is ok 0.1Ohm ((Power 0.8V when on)
Resistance on 12V 4K ohms (Power present when on)
Resistance on 12V PEX 4K ohms... -
Hi, I'm Daniel, and I'm new to the world of repairing motherboards.
I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.
I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.
So, I generated a table with AI so I can... -
I have Asus FA506 ( board DA0BKXMB8D0 Rev: D). Can you please roughly indicate what the lowest resistance I should measure on a coil? I know that a low resistance is allowed on coils in CPU or graphic circuits but can you provide acceptable values of resistance?
Thank you. -
Hello everyone, I have a 645 G9 here with a Ryzen 5 PRO 5675U.
This board has a blown inductor component above the driver chip to the CPU coil, and I am wondering whether the CPU is shorted/dead.
Could anyone please measure the resistance to ground on the leftmost coil/inductor to the CPU?
My resistance value is 2.2 Ohms, which doesn't look good to me.
Thanks to everyone willing to give a value. -
Lenovo Legion 5 15ARH05H, NM-D281 Rev 1.0, "BIInitializeLibrary failed 0xc0000185" and bios freezingDear members,
I have a problem with this machine that still I can't solve, I hope some of you can suggest me something.
I was the first one to open the machine and touch the mainboard, in fact the Lenovo seal was intact the first time that I unscrewed all the internal screws.
The ower told me that it was working very good until Windows kicked "something like a firmware update" (owner's words) then the system started acting weird.
When you try to start it, some seconds after having pressed the power button, Lenovo splashscreen appears, then after 1 second, in the...
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