Re: Did I do anything wrong?
Did you recap the power supply ?
Also check and make sure that you did not put any cap in backwards
-
Did I do anything wrong?
So I had this problematic HP Touchsmart 300 "all-in-one" computer sent to me. It would run for a few minutes, and then cut power off. Oddly enough, the LED on the power button would stay lit, but system goes on a complete dead stop. I checked the motherboard and everything (overheating and the like), and it looks fine. So that leaves the power supply...
Since this unit uses a propietary Delta DPS-200PP-171(a) power supply, it leaves my usable spare ATX power supplies out of the question for troubleshooting.
Previously, I successfully recapped a Dell E153FPc with some UCC caps salvaged from another board - prior to that, the monitor would stay on for a few minutes and then shut off whilst the power button LED stayed lit. So I guessed it must be the same problem.
Off to Digikey, I purchased some Nichicon caps:
RATING QTY L X D NOTES PICK
16v, 1000uf 3 ea 20X10MM UPW1C102MPD x
10v, 1000uf 1 ea 20X8MM UPW1A102MPD6 x
50v, 10uf 2 ea 8X5MM UPW1H100MDD x
50v, 47uf 1 ea 11x7mm (guess) UPS1H470MED x
50v, 100uf 1 ea 10x8mm (guess) UPW1H101MPD
450v, 150uf 1 ea 30x25mm P11804-ND x
After soldering, I tried to boot up the system, the fans would spin but the LCD will not come on. Also, I checked the red (5v) wires show 0 volts on the multimeter but the 12v rail still has 12v present on it. If someone here has the schematics for the DPS-200PP-171, I'd like to have one; as well as your input.
When I get back from my regular day job, I'll try to post some pics of this baby.
Thanks!
-
Hi,
I was given a laptop with a BIOS locked by a password. I read that one way to unlock it is to read the EEPROM contents, patch them, and write them back. I was using the typical CH341A programmer and clip to do this, but because the clip is so loose, after patching the dump I accidentally placed the clip on the wrong EEPROM and now the laptop won’t boot.
Can I do something to fix it? I’ve attached photos.
... -
Hi,
Anybody has experience repair PSU burned out due to connect to EVGA molex/sata cables. I know the cable is not compatible (i got them mixed up), but I though i can connect it and use a PSU tested to find out which is the wrong sata/molex cables. As soo as I pluged in the powered molex cable to the PSU tester, the power supply short out, and will not turn on anymore. After the incident, the PSUs (both HX1200 and C850) try to power on and shut itself off immediately. The ATX PSU tester survice the short circult, still working perfectly. Anybody know if it's an easy fix or know which parts... -
Hello everyone.
I have come here with a rather specific question. I was given a Dell Latitude 7420 laptop with a busted screen, and wanted to see if I could refurbish it into my daily driver. I wanted to experiment and see if a 2-in-1 display would work as the chassis of the laptop and 2-in-1 7420 looked identical. I threw in the display and my hypothesis was correct, however, I was greeted with a locked BIOS and since I didn't know the password, I figured I'd try to unlock it somehow. I bought one of those POGO pin probe things for my CH341A programmer so I could read and make... -
Hi everyone,
I hope someone can help me.
I have an Asus ROG Strix Scar 18 (G814JZ) laptop with a Winbond 25Q16JWNIG chip on the motherboard.
Unfortunately, I flashed the wrong file (BIOS/EC/other region – I'm honestly not sure anymore), and now the laptop is completely dead: no display, no fan spin, no reaction at all.
I have a CH341A programmer and I'm able to read and write to the chip. However, I'm not sure which software is best (AsProgrammer, NeoProgrammer, etc.) or if there's anything specific I should watch out for.
A valid BIOS/EC backup... -
Long story short:
- dad converted Asus Chromebox CN62 into Windows compatible, with mrchromebox BIOS, years and years ago
- gave the computer to his son a couple years later
- son now decided to revert it to Chrome OS, to sell it as original (re-writing BIOS with the backup one created by his dad)
- too lazy to remove the board from the case, thought a voltage regulator was the BIOS chip (you know... it has 8 legs)
(seems like the story was not that short)
He used alligator clips to read the chip. No luck reading it. Removed chip and placed on a SOC-8...
Leave a comment: