How to check dead laptop motherboard protection and Isolation section
How to check dead laptop motherboard protection and Isolation section...........leave a comment.
https://youtu.be/P-S-vp_rZUg
https://youtu.be/P-S-vp_rZUg
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Hi,
I am working on an Asus ROG laptop repair. I was able to find that there is a short on the motherboard, and the 20 volts from the charger only gets to the first mosfet before disappearing.
When looking around with a thermal camera, I noticed the chip marked "14C" in the picture was getting warm. Nothing else was receiving heat.
I found a boardview diagram and schematic for a motherboard that looks nearly identical, that has the same component. This appears to be marked as "AC Short Protection" with a value of 13.7KOhms.
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My venerable and old laptop (Toshiba Satellite P75-A7200 equipped with an i7-4700MQ, circa 2014) and previously a powerful machine during its heyday is no more. Have been using it for many years, but about 3 months ago it went kaputt for no apparent reason (left it on overnight [normally it goes to standby mode after some idle time], and in the morning it was cold dead with no boot, no post, no leds; nothing at all).
Since the 1990s I have been building custom desktop computers, etc; but it has been few years since my last built one and for the last 15 years I have built very few... -
Greetings and sanitations! Several years ago I received some really awesome help on this forum for fixing my monitor (which is still working) so I figure maybe someone can help with this laptop issue.
I have a Dell E6540, motherboard 9411P, DP/N:VWNW8. A year ago it died a strange death where at first it wouldn't turn on all the time, but would turn on when it felt like it, then it got worse where it wouldn't turn on at all and I would just get a flashing light. So I replaced the motherboard with a matching part number board. (I still have the old motherboard) Now a year later this... -
Subject is a blank screen issue in HP Envy 17-3290NR 3D version laptop with motherboard Louis V1.1 6050A2489901 MB-A02. Production year is 2012. This one is a 2nd hand motherboard which I could use it for few months only. Suddenly no output from the internal display and also no signal from HDMI port then Windows out of order after few boots.
Caps lock working normally and no HP's caps-lock warning blinks. Making a hard reset and replacing the RAM sticks or using different slots didn't help.
Fans are spinning. Blindly could install windows11 and got the device manager... -
Here’s another motherboard that needed a full recap: an ASUS P5GC-MX.
This one was gifted to me some years ago by user Pentium 4, along with a few other goodies. It actually came in working order with no bulging or leaking caps. However, I noted there were United Chemicon KZG caps everywhere on the motherboard. The CPU VRM output (CPU V_core) was the only exception: it had only 2x KZG. The rest was 6x UCC TMV 4V 680 uF caps… which aren’t any good news either.
So here is what the motherboard looked like with its original caps:
CPU VRM area up close…...