I am not sure why this is happening but whenever I use a probe on the test point ( TP44 ) it immediately shuts down the laptop. I have replaced the R147 and removed C130 but still does the same.
Schematic attached.
Schematic attached.
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Re: Checking voltage on TEST Point shuts down motherboard immediately
What is the actual problem with the machine?OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: Checking voltage on TEST Point shuts down motherboard immediately
Hi friends.. anyone willing to give some pointers. . Thanks in advance.Comment
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Re: Checking voltage on TEST Point shuts down motherboard immediately
if you are using a probe at your test point ( TP44), it is normal for the laptop to shut down immediately. try without the power button board and keyboard first. measure with oscilloscope in voltage coils. imbalance?I'm not happy to be so strong. because it's not humanlyComment
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In the service manual for Galaxy S7 (SM-G930F), step number four in the flow chart for troubleshooting power-on issue is to check the voltage level of a "signal".
I had a very hard time locating this. I didn't understand what it means to check for voltage of something by its signal name, and it's location was not described in the service manual (not that I could see in my four chapter excerpt of the complete manual). Then I learned that this signal name needs to be translated into a test point (TP) ID on the board. This is unlikely to be referenced in a service... -
I have two TCL A30 phones.
Old Phone: This phone worked fine for years, then stopped charging If you plugged a charger into it, the phone would make the charging sound, the phone would tell you it is charging, but the battery icon would not have the charging symbol in it and the battery would not charge.I tried new battery, same behavior.
New Phone: Works fine, bought as a donor board to try and repair Old Phone
My interest here is to repair Old Phone, using components parts off New Phone if needed. I am not interested in replacing Old Phone with New Phone.... -
This specification for the HP EliteDesk 800 G3 + OfficeConnect OC20 2x2 Dual Radio 802.11ac (RW) Access Point can be useful for upgrading or repairing a desktop PC that is not working. As a community we are working through our specifications to add valuable data like the EliteDesk 800 G3 + OfficeConnect OC20 2x2 Dual Radio 802.11ac (RW) Access Point boardview and EliteDesk 800 G3 + OfficeConnect OC20 2x2 Dual Radio 802.11ac (RW) Access Point schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information....09-12-2024, 02:00 PM
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Hello
I have power adaptor(220V/input, 12V 1.2A/output) which has symptom of fluctuating output DC voltage between 11.5V-12.2V.
So I opened its plastic case and when switched it on, I heard constant tik tik sound from inside its PCB.
I measured DC voltage between negative and positive pin of the largest capacitor(400v 10uf) and it was measured contant 300V.
I also measured ESR value of all capacitors and I noticed that one of capacitor(KMG 16v 470uf), which located in the secondary side, have high ESR value(10 ohm),So I replaced it with same specification NXH capacitor.... -
Laptop model: Sp513-54n-74V2
Testing power rails (separated by chip) reveals:
19V_DCBATOUT - (active)
5V_AUX_S5 - (active)
5V_S5 - (active)
3D3V_AUX_S5 - (active)
3D3V_S5 27Ω - (good) - enabled by Nuvoton chip
1D8V_VCCIN_AUX - (good) - enabled by 1D8V_S5 PG signal -- (dependent on 3D3V_S5)
1D8V_S5 41Ω - (good) - enabled by 3D3V_S5 PG signal
1D05V_VNN_BYPASS - (good) - enabled by 1D8V_VCCIN_AUX PG signal...
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