Hp smps power suppy ps4321 liteon help!!!

NConstantinou

Badcaps Veteran

Join Date: May 2017

Posts: 335

Country: Cyprus
#1

Hp smps power suppy ps4321 liteon help!!!

05-15-2022, 01:58 AM

Dear all

i have this ps which has the reading indicated without shorting power on.
when i short ps on the light bulb is lighting continuously.
does this mean that there is a short!
power supply does not come on.
i have checked on secondary output wires 12v,3v,-12v,5v and nothing is shown ad short. also on primary.
the black reading are from 3 optocoupler.

Thanks
Attached Files

IMG_0079.rar (152.6 KB, 11 views)

Last edited by NConstantinou; 05-15-2022, 02:01 AM.
Tags: None

Previous template Next

ThinkPad T490 20N2000CSC NM-B901 no signs of life - short on 5V SMPS, ThinkEngine-3 hot - *speculations*

by feliks912

Attached schematic 🙂.

Laptop gives no signs of life. No fan and no CPU heat.

Think Engine BD4179MWV is hot on plugging in *AND* pressing the power button.

Discovered short to ground on VCC5M power delivery IC NB690GRP (5 volt line, not the high current VCC5M_PD) which is one of the ways that chip is powered. I'm puzzled.

Nothing else is warm on the board. CPU resistances are OK, 9V VSYS line is present from the BMIC. All misc and cables are disconnected.

What do you guys think happened? I've got two theories:

If the...

I think ThinkEngine shorted first

50.00%

1 vote

I think 5V SMIC shorted first

0%

0 votes

I think something else happened

50.00%

1 vote
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
05-07-2024, 04:44 PM
Extreme High Current & Low Voltage Short Killer ??

by DynaxSC

Hi Folks

I'm looking for a extreme high current short killer solution for a reasonable cost.

I have an LGA1700 motherboard (ASUS PRIME Z790-P WiFi) where I exchanged the LGA socket already 3 times, and every time after the socket exchange I get a short of power supply lines VCORE (V variable) and VCCIN_AUX (1.8V).
After taking off the socket, the shorts dissappear again.
The soldermask on the socket is already partially demaged from the heat, so I have reconstructed the soldermask by manually painting the missing soldermask parts with a very small top of a...
- Channel: Troubleshooting Desktop Motherboards, Graphics Cards, and PC Peripherals
10-15-2024, 10:13 AM
MacBook Pro 14" A2442 Short on PPBUS_AON but no short present when injecting voltage!

by Stephen

I check PPBUS_AON and there is a short present on the line, the computer shows a short when testing for short to ground, so when I inject voltage into the line, I get 0AMPS so no short is showing up. I have replaced a blown cap on this board that exploded and tested for the short and it is now removed. Any suggestions? I tested voltage at the line when the fuses are connected and I am getting 1.2 Volts at the line.
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
02-06-2025, 12:03 PM
Acer Nitro 5 LA-L181p power LED turns on by 5 secs (Short on PCH rail?)

by Victor Moreira Silva

Hello everyone,

I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.

Well, my decice specs are the following:

Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c

The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...
- Channel: Troubleshooting Laptops, Tablets, and Mobile Devices
05-26-2025, 10:49 AM
Hp smps power suppy ps4321 help!!!!!!

by NConstantinou

Dear all

i have several power supplies that when the transformer is connected on board
secondary pins are all shorted (7pins).
by removing it pins 1 and 5 are shown short and 2,3,4,6,7 are shorted between them.

i tried to find datasheet but nothing. ps is manufactured by LITEON

CAN ANYONE HELP!

THANKS.

ON PS I HAVE 4.3V ON POWER SWITCH ON...
- Channel: Troubleshooting Power Supplies and Power Supply Design
04-29-2022, 05:17 AM
Loading...
No more items.

Hp smps power suppy ps4321 liteon help!!!

Hp smps power suppy ps4321 liteon help!!!

Related Topics