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Patient: Norstar - Plus modular ICS NT7B62FA power supply.
Complaint: Doesn't power up anymore. It did work for a short while, next morning dead?
U1 (UC2844) Vcc pin jumping up and down between 10V and 15V. Vcc supply resistor 51.1k and capacitor 100uf 40V is o.k., but jet there is nothing coming out on the other end. Secondary is producing nothing, no shorts, nothing visible.
Replaced U1 (UC2844) with a new one, powered the PSU up on the bench and the LED started to blink faintly. Plugged the PSU card back into the Norstar modular ICS and all is working... -
Intel (R) Modular Flash Image Tool. Version: 18.0.10.2285... -
Hi all,
I have little experience with board repair, but repaired a motherboard recently (it was a bad cap) and really enjoyed the experience, and now bought a known-broken laptop as a learning project. However it seems I'm stuck quite early on.
Laptop: Dell XPS 15 9570
CPU: Intel Core i7-8750H
GPU: GeForce GTX 1050 Ti
Motherboard: Compal LA-F541P (schematic attached)
Original AC adapter that is outputting 19.38 V
History: I bought the laptop while broken, but the previous owner states it just stopped working one day. There... -
hi
in a pcb circuit of welding machine
i have three resistances smd 4.7 ohm burnt in series with std2nb80t4 also burnt
with hole on the middle
this mosfet is connected on primary of an transformer and it seems take dc voltage
how can i calculate the watts of smd resistances to be sure i have choice the right value
can i take from an older pcb smd resistance with the same size?
is right ? -
I have YouTube premium that my son let use it has an alert feature that goes by what you watch
https://youtu.be/aRdQ1yRSJXA?si=VkIYayDqIPHEWs1t
Unfortunately the board files are not available and it dose not have all of the parts listed either unless you can get the wiring diagram and begin able to print them...
Working...
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