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Good morning,I have a problem,i pratice electronic,i want to have informations about technology of power supply,so i can repair them easyly

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Compaq 1420 nx turns on then turns off immediately

A brief primer if I may;

Electrolytic Capacitors are used on the motherboard, and in the Power Supply, in the Compaq Presario 1420nx Desktop PC;

HP Support > Compaq Presario SR1420nx Desktop PC > Main Support page,

Product information > Product specifications > Motherboard Specifications, P4GV-LA (Guppy),

Scroll down to the motherboard Photo.

General example of a Switched-Mode Power Supply, (SMPS), case open,

Personal computers have used this style of Power Supply, for quite some time.
The one in your computer is just an ATX style, and is the type used in MANY personal computers. (Not Small Form Factor, however)

THIS IS NOT an invite to open your Power Supply, and attempt repair.
The capacitors used are Radial Aluminum Electrolytic Capacitors.
The blue ones marked by the letter B, are high voltage. MAY have Up To 100 Volts stored.

Your fingers touch the terminals on the bottom, of one of these babies; the shock can be BAD to FATAL!

Your fingers touch a circuit, that one or more capacitors are in, and the shock can be BAD to FATAL.

There is a Proper method to discharge them, BEFORE working on the unit. Am not going to post.
(Does NOT involve a metal screwdriver, or other metallic object! Good way to have hot molten metal spray in your face!)

The method of repair is to REPLACE.

Inside an Electrolytic Capacitor is Electrolytic Paste.
This paste breaks down over time. Chemical composition breaks down.

Computer engineers know this, and use capacitors that are rated at twice, or 200 percent; of what is needed.
This way when the capacitor breaks down to 50 percent good, it is still 100 percent good for the application it is used in.

Unplug an electronic unit from power, and the chemical composition of the paste breaks down more rapidly. All electronic units need a trickle charge when being stored. (Pawn shops know this)

To summarize;
FOLLOW Anti-Static Precautions after unplugging your computer from power, BEFORE reaching inside your computer. (Don't know, and would like to? Post in a Comment)

Check the 'caps' on the motherboard.
Note* Sometimes the Electrolytic Paste dries up, and shows NO outward visual signs of failure.

'Caps' on motherboard found to be good, suspect the Power Supply.
I can guide you in testing it, or you may have a KNOWN to be good, Compatible power supply, from a working computer that you can borrow for a test unit.


Dec 04, 2012 | HP Compaq Presario SR1420nx...


Computer Acronyms

ADSL - Asymmetric Digital Subscriber Line
AGP - Accelerated Graphics Port
ALI - Acer Labs, Incorporated
ALU - Arithmetic Logic Unit
AMD - Advanced Micro Devices
APC - American Power Conversion
ASCII - American Standard Code for Information Interchange
ASIC - Application Specific Integrated Circuit
ASPI - Advanced SCSI Programming Interface
AT - Advanced Technology
ATI - ATI Technologies Inc.
ATX - Advanced Technology Extended

BFG - BFG Technologies
BIOS - Basic Input Output System
BNC - Barrel Nut Connector

CAS - Column Address Signal
CD - Compact Disk
CDR - Compact Disk Recorder
CDRW - Compact Disk Re-Writer
CD-ROM - Compact Disk - Read Only Memory
CFM - Cubic Feet per Minute (ft/min)
CMOS - Complementary Metal Oxide Semiconductor
CPU - Central Processing Unit
CTX - CTX Technology Corporation (Commited to Excellence)

DDR - Double Data Rate
DDR-SDRAM - Double Data Rate - Synchronous Dynamic Random Access Memory
DFI - DFI Inc. (Design for Innovation)
DIMM - Dual Inline Memory Module
DRAM - Dynamic Random Access Memory
DPI - Dots Per Inch
DVD - Digital Versatile Disc
DVD-RAM - Digital Versatile Disk - Random Access Memory

ECC - Error Correction Code
ECS - Elitegroup Computer Systems
EDO - Extended Data Out
EEPROM - Electrically Erasable Programmable Read-Only Memory
EPROM - Erasable Programmable Read-Only Memory
EVGA - EVGA Corporation

FC-PGA - Flip Chip Pin Grid Array
FDC - Floppy Disk Controller
FDD - Floppy Disk Drive
FPS - Frame Per Second
FPU - Floating Point Unit
FSAA - Full Screen Anti-Aliasing
FS - For Sale
FSB - Front Side Bus

GB - Gigabytes
GBps - Gigabytes per second or Gigabits per second
GDI - Graphical Device Interface
GHz - GigaHertz

HDD - Hard Disk Drive
HIS - Hightech Information System Limited
HP - Hewlett-Packard Development Company
HSF - Heatsink-Fan

IBM - International Business Machines Corporation
IC - Integrated Circuit
IDE - Integrated Drive Electronics
IFS- Item for Sale
IRQ - Interrupt Request
ISA - Industry Standard Architecture
ISO - International Standards Organization

JBL - JBL (Jame B. Lansing) Speakers
JVC - JVC Company of America

Kbps - Kilobits Per Second
KBps - KiloBytes per second

LG - LG Electronics
LAN - Local Are Network
LCD - Liquid Crystal Display
LDT - Lightning Data Transport
LED - Light Emitting Diode

MAC - Media Access Control
MB - MotherBoard or Megabyte
MBps - Megabytes Per Second
Mbps - Megabits Per Second or Megabits Per Second
MHz - MegaHertz
MIPS - Million Instructions Per Second
MMX - Multi-Media Extensions
MSI - Micro Star International

NAS - Network Attached Storage
NAT - Network Address Translation
NEC - NEC Corporation
NIC - Network Interface Card

OC - Overclock (Over Clock)
OCZ - OCZ Technology
OEM - Original Equipment Manufacturer

PC - Personal Computer
PCB - Printed Circuit Board
PCI - Peripheral Component Interconnect
PDA - Personal Digital Assistant
PCMCIA - Peripheral Component Microchannel Interconnect Architecture
PGA - Professional Graphics Array
PLD - Programmable Logic Device
PM - Private Message / Private Messaging
PnP - Plug 'n Play
PNY - PNY Technology
POST - Power On Self Test
PPPoA - Point-to-Point Protocol over ATM
PPPoE - Point-to-Point Protocol over Ethernet
PQI - PQI Corporation
PSU - Power Supply Unit

RAID - Redundant Array of Inexpensive Disks
RAM - Random Access Memory
RAMDAC - Random Access Memory Digital Analog Convertor
RDRAM - Rambus Dynamic Random Access Memory
ROM - Read Only Memory
RPM - Revolutions Per Minute

SASID - Self-scanned Amorphous Silicon Integrated Display
SCA - SCSI Configured Automatically
SCSI - Small Computer System Interface
SDRAM - Synchronous Dynamic Random Access Memory
SECC - Single Edge Contact Connector
SODIMM - Small Outline Dual Inline Memory Module
SPARC - Scalable Processor ArChitecture
SOHO - Small Office Home Office
SRAM - Static Random Access Memory
SSE - Streaming SIMD Extensions
SVGA - Super Video Graphics Array
S/PDIF - Sony/Philips Digital Interface

TB - Terabytes
TBps - Terabytes per second
Tbps - Terabits per second
TDK - TDK Electronics
TEC - Thermoelectric Cooler
TPC - TipidPC
TWAIN - Technology Without An Important Name

UART - Universal Asynchronous Receiver/Transmitter
USB - Universal Serial Bus
UTP - Unshieled Twisted Pair

VCD - Video CD
VPN - Virtual Private Network

WAN - Wide Area Network
WTB - Want to Buy
WYSIWYG - What You See Is What You Get

XGA - Extended Graphics Array
XFX - XFX Graphics, a Division of Pine
XMS - Extended Memory Specification
XT - Extended Technology

on Jun 04, 2010 | Computers & Internet

2 Answers

Which video card do i use in a vcg rb50

you have pci express slot that supports high graphic card. You can buy a high graphic vga card but it relates with your power supply too. Check your power supply wattage and then buy the vga card accordingly because high graphic vga card require more power from supply.

There are alot of pci slot supported card in the market.

best of luck!

Mar 18, 2012 | Sony VAIO VGC-RB38G PC Desktop

1 Answer

Hp pavilion slimline s5000 series whats the highest graphics card i can put in it

There are 14 different versions in the s5000 series of slimline desktop computers,
{From s5200z to the s5285t}

Some are Intel processor based, some are AMD processor based.
The Power Supply wattage differs also. Seems it goes from 220 Watts to 300 Watts.

All versions have a PCI-Express x16 expansion slot, though.

[ It is based on the PCI-Express 1.1 version technology
A graphics card based on the PCI-Express 2.0 technology will work.

Because PCI-Express 2.0 is backward compatible with PCI-Express 1.1

"PCIe 2.0 motherboard slots are fully backward compatible with PCIe v1.x cards. PCIe 2.0 cards are also generally backward compatible with PCIe 1.x motherboards, using the available bandwidth of PCI Express 1.1. Overall, graphic cards or motherboards designed for v2.0 will work with the other being v1.1 or v1.0."

1) Motherboards based on the PCI-Express 2.0 technology, are compatible with a PCI-Express graphics card that is based on the older PCI-Express 1.1 technology.

2) PCI-Express graphics cards are also generally compatible, if they operate at the smaller bandwidth of PCI-Express 1.1

Since the slower technology of PCI-Express 1.1 is what is available on your motherboard, a graphics card based on PCI-Express 2.0 will not operate at full capability.

{Graphics cards based on the new PCI-Express 2.1 technology will work also }

Will you notice?
No ]

What is the limit for a graphics card?
The sky.

Two problems though.
A) The Power Supply
B) The available room inside the computer case for a graphics card.

1) Power Supply:
According to HP Support, and looking at the specifications for the s5200z, and s5285t, the top of the line graphics card is an Nvidia GT220.

This is due to the low power consumption. (And probably reduced cost from Nvidia)

Based on price, and performance however, the GT220 is a less than choice.

Using a Zotac version as an example,

Stream Processors = 48

You can have the fastest Core Clock, and Memory Clock, plus all kinds of graphics ram memory, but if you do not have enough Stream Processors, your graphics card will be less than adequate.

Consider Stream Processors as the 'Information Highway'. The path that graphics information takes from the Processor to the Graphics Card, and back.

If you do not have enough stream processors it's like a road being worked on.
Traffic is redirected into just one lane. Everything slows down.
There is a 'Bottleneck'.

Most decent graphics cards that are better than a GT220, require a Power Supply with 400 Watts, or greater.
The size and shape of the Power Supply's case, makes it hard to find a replacement that is greater than 300 Watts.

2) Available room for a graphics card (Height) inside the computer case:

With the Slimline case you have to purchase graphics cards that are Low-Profile.
{Low Height}

It isn't so much the length that you need to be concerned with, as it is the height of the graphics card.
The length of a graphics card goes from the back of the computer towards the front.
The height of a graphics card goes from side to side inside the computer case.

Average width inside a Slimline case seems to be around 4 inches.

You have to take into consideration; how far the motherboard is supported off of the support plate inside the computer case, and when inserted how high does the graphics card sit in the PCI-Express x16 expansion slot.
4 inches is Not enough room.

If it were I, I would remove all internal components, and install them in a cheap, decent, Mid-tower computer case. There is more room inside the case for a taller graphics card, and the case will use the common ATX style of Power Supply. A 600 Watt ATX power supply is pretty economical.

{There is also more room inside for air flow. Air is the cooling medium for a desktop computer. (Unless it's a high-end gamer computer. Dry Ice, Nitrogen, Refrigerant etc. have been used )

More air flow means cooler hardware components inside the computer.
Result? Longer life, more reliable }

Then I would use an ATI Radeon HD 5750 graphics card, (And a decent 600 Watt power supply)

{A decent mid-tower computer case averages around $50 }


Sep 11, 2011 | HP Computers & Internet

1 Answer

Power supply is damage


Good day. For your power supply you better bring it to the nearest technical repair store. Plasma tv pc desktop are very sensitive and its dangerous if your just going to replace the power supply by yourself. Look for a number to contact for assistance on the receipt you got when you purchase the device. They will be able to give you suggestions in fixing the power supply. Hope this information help resolve your problem.

Thanks for using fixya and have a great day.

Jun 10, 2011 | Gateway FMC-901 w/ 42-inch Plasma TV...

2 Answers

Upgrading graphics card

This is eMachines Support, and the specifications page for the eMachines C6535 desktop computer,

Scroll down the list until you come to the Video heading.

You'll see - PCI Express (PCI-E x16) slot available

This means you have a PCI Express x16 graphics slot on the motherboard, and it is open, and available.

You can use a PCI Express graphics card.

Two things I would like to note.

1) You need to check the System Requirements of the PCI Express graphics card you're going to buy, and see if your System Resources are able to support it.

The main thing you need to look for here, is what power is required for the graphics card.

Does your Power Supply have the necessary Wattage?

Not only does your Power Supply have to be able to deliver the necessary power for the computer system resources (Processor, Ram Memory, etc), it also has to be able to deliver enough power for THAT graphics card.

Since eMachines Support doesn't list the power of the Power Supply, I searched online for a Power Supply replacement for the C6535.

Seems the C6535 comes with a 300 Watt power supply.
Problem is, back in the day the C6535 was made, power supply manufacturers were 'Fudging' the true maximum Wattage, that their power supply's were truly able to deliver.

A more realistic figure, is 70 percent of the maximum rated Wattage stated.
This would be 210 Watts.

Therefore, you're going to need a better power supply, to support any of the really decent PCI Express graphics cards out there.

2) PCI Express came out in 2004.
PCI Express is a technology.

The PCI Express technology has gone through three major changes, or upgrades, since it came out.

A) PCI Express 1.0 version
B) PCI Express 1.1 version
C) PCI Express 2.0 version

PCI Express graphics cards now, are made in the PCI Express 2.0 version.

You can use a PCI Express 2.0 graphics card in a computer with PCI Express 1.1 technology.

PCI Express 2.0 is Backward Compatible with the PCI Express 1.1 technology.

Your computer uses the PCI Express 1.1 technology.

If you use a PCI Express 2.0 graphics card in a computer with PCI Express 1.1 technology, you won't get the full capability of the PCI Express 2.0 graphics card.

Will you notice?
We haven't begun to fully use all the bandwidth of the PCI Express 1.1 technology yet, much less PCI Express 2.0

(PCI Express 3.0 technology is just around the corner, and getting ready to be used on newer graphic cards. Marketing strategy)

Have any further questions concerning this, please post in a Comment.

Information on PCI Express,

May 18, 2010 | E-Machines eMachines Desktop PC

2 Answers

My computer says no RGB signal what does that mean?

It essentially means No Video Signal.

You are not receiving a video signal TO the monitor.
The monitor seems to be working A-OK.

Problem may be,

1) Bad monitor cable.

If the monitor cable is removable from the monitor, suggest use a monitor cable that is known to be good for a test. Perhaps one from a working computer, just borrowed for a test.

If the monitor cable is of the type that is not removable, try another known to be good monitor with cable, if available.

2) If this problem is listed in the correct category, and the desktop computer is a Gateway GT5404,

The GT5404 comes stock with Integrated Graphics. This is a graphics chip that is soldered to the motherboard.
(Another name for Integrated Graphics is OnBoard graphics. On the motherBoard)

The graphics chip is an Intel GMA 950. {Intel Graphics Media Accelerator]

This GPU is soldered to the motherboard.

[Chip and Chipset are slang terms for I.C. Integrated Circuit.
GPU stands for Graphics Processing Unit.
A type of 'Chip', ]

If this GPU is at fault, you'll receive no video signal.

You can use a video (Graphics) card to bypass using the Integrated Graphics, and have your graphics back.

(Don't forget to plug the monitor cable into the graphics card, not to the motherboard. Don't laugh! {Lol!} I've guided people who have done this)

The GT5404's, Intel (Coryville) 945G motherboard has a PCI-Express x16 slot for a graphics card.

Supporting data:

Click on the heading - Specifications. Read down to the subheading - Add-in Card Slots.
One PCI Express x16 (graphics interface)
One PCI Express x1
Two PCI conventional.

Also go back to the main menu, and click on Components.
Scroll down to the subheading - Motherboards, and click on -
4006158R - Intel (Coryville) 945G Motherboard

[ Note* Uses the PCI Express 1.1 technology.
The Intel 945G chip came out May 2005. PCI Express 2.0 technology didn't come out until January 15, 2007.

You can still use a graphics card based on the PCI Express 2.0 technology.
PCI Express 2.0 technology is Backward Compatible, with PCI Express 1.1 technology.

You just won't get the full capabilities of the PCI Express 2.0 graphics card.
Will you notice?
Also a Pentium 4 processor is not a high gamer processor. Single Core processor. It is a 'bottleneck' for graphics information, when trying to play intense newer games ]

3) Largest problem/s directly related to a failed computer (About an 80 percent ratio, or higher)

Dirty Computer Inside/Bad Power Supply:

Dirty Computer
A large percentage of computer problems are directly related to the inside of the computer being dirty, as well as the inside of the power supply.
Using a can of air on a regular basis as needed, could have prevented this problem.

(Computer - Unplugged from power.
Open computer case, Touch the metal frame {Non-painted surface} to relieve your body of Static electricity, before beginning to clean)

The hardware components located inside a personal computer, are cooled by air.

Air is drawn in through the front of the computer case, drawn over the cooling components for the Processor, (Heatsink/Fan combo),
and out through an exhaust case fan at the back of the case, and/or, air is drawn out through the Power Supply.

If the finned Heatsink has the spaces between the fins clogged, and the Processor's fan is clogged, the cooling capacity will drop tremendously.

A Processor has a Thermal Limit. It can only get so hot, before it turns off. (BIOS turns it off)
No Processor running, no computer. No computer = No Video Signal on monitor.

Power Supply
When the cooling components for a Power Supply are clogged, (Heatsinks inside, and the fan, are a Power Supply's cooling components), the Power Supply heats up.

Heat = Wasted Energy
The Power Supply tries to keep up with the call for power, and eventually components inside the power supply break down, or fail.

This cause a weak voltage power rail.
1) ALL the lights use less than 1 Watt of power
2) EACH fan uses 2 to 3 Watts
3) A typical Processor uses 51 to 125 Watts at maximum capability. Depends on what Processor it is.

Your power supply could still deliver enough voltage to light lamps, and even spin fans, but not enough for the Processor.

I would substitute the monitor cable first. Then (Computer unplugged from power), I would open the computer case, and see how dirty it is inside, and the Power Supply.

If you wish to know how to test your Power Supply, simply state so in a Comment. (Believe upper right of page)
You'll need an inexpensive multimeter (About $10 -$12), or a power supply tester.

Apr 06, 2010 | Gateway GT5404 PC Desktop

2 Answers

Dell computer has no power

The PC power supplies are always connected to power, the so-called off state is in reality stand-by. I'm afraid that the cause of the breaker tripping (some power surge or something) has killed your PC's power supply unit.

Oct 24, 2009 | Computers & Internet

1 Answer

Yes the light is under the power cord. I unpluged and waited for the light to go away. I give it about 30 min then pluged it back in. that did not work. every thing else on the same power strip works. It...

Sounds like a power supply. Look for fuses on the motherboard that could be blown. Also, you may smell a distinct smell of burnt electronic devices when you smell near PS. Good indication it is fried.

Jun 23, 2009 | Gateway 838GM (RB838GM) PC Desktop

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