Question about HP Pavilion a1620n (882780664494) PC Desktop

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POST: 12V, 5V,3V - OK, CLK - OK, no PCI frame signal, no IRDY signal, RST always on

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6ya6ya
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Posted on Jan 02, 2017

bob_computer
  • 3153 Answers

SOURCE: Pin Name Color Description

Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Posted on Aug 11, 2009

  • 18 Answers

SOURCE: http://pinouts.ru/Power/atx_v2_pinout.shtml

um what you want lol:?

Posted on Sep 07, 2009

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Hi, my HP Pavilion a1620n desktop pc is not displaying .post detect card no IRDY and Frame reset lights ,i cahnge power supply. ram.and unplug all cable ....**** fail. please help me .....plz


1) It might be a motherboard problem, you may have to change a suitable motherboard
2) Try reset your motherboard to default setting,
3) if your motherboard do work, get a old PCI display card if possible. Try to get a display
4) go to HP website to get your latest bios to see everything is in place

Mar 22, 2011 | Computers & Internet

1 Answer

My Presario F500 doesnt power on.. whats could be the problem.. I can see the green power led on.


do it only if u r a professional..
assuming that the system bios hs not been flashed or updated in a wrong way..if so u gotta replace the m/b..
1st see if the ram(s) is loose/faulty..open n resit it..
check for ac main supply and fuse..next check all the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..if faulty try repairing or replacing the power supply with a standby n see..
if all above are ok..check the cmos/system battery..(above +3v)..
check the cpu fan rotating and the cpu generating heat..try replacing the cpu with a standby (if no heat is generated)..
there may b a chance for m/b's crystal clock generator to b faulty..try repairing or replacing the m/b with a standby..
hope it'll b enough to solve ur problem..
seek professional assistance of ur system admin/vendor....

Oct 31, 2009 | HP Compaq Presario F500 F700 and G6000...

1 Answer

My system donot boot at all


do it only if u r a professional..
assuming that the system bios hs not been flashed or updated in a wrong way..if so u gotta replace the m/b..
1st check for ac main supply and fuse..next check all the outputs of smps viz. 0v (black~ground); +12v (yellow); +5v (red, green~ps-on, violet~pg & grey~sb); -12v (blue); -5v(white); +3.3v(orange)..if faulty try repairing or replacing the power supply with a standby n see..
if all above are ok..check the cmos/system battery..(above +3v)..
check the cpu fan rotating and the cpu generating heat..try replacing the cpu with a standby (if no heat is generated)..
there may b a chance for m/b's crystal clock generator to b faulty..try repairing or replacing the m/b with a standby..
hope it'll b enough to solve ur problem..
seek professional assistance of ur system admin/vendor....

Oct 30, 2009 | Computers & Internet

2 Answers

2002 Dodge Grand Caravan Driver Door Lock/Unlock Switch


sorry not sure the 12v prob will help this swtich works on 5v off 3v unlock 1v lock single wire lock/unlock logic signals
I found wiring diagrams at
http://www.dodge.com/bodybuilder/2004/docs/wd/rswd/tc.pdf
it is 2004 but use the wiring diagrams to test the wires
(most likely to fail where they flex)
because it is using logic gates disconnect the plug at each end of the wire you are testing or the damn thing will find a few diffrent ways to trick you.

Apr 04, 2009 | 2002 Dodge Caravan

1 Answer

Pin Name Color Description


Yes this is a good list of the voltages to be expected from a newer power supply on just the main header

Apr 01, 2009 | HP Compaq dc7100 PC Desktop

1 Answer

Dell 1800FP, no signal found (analog). Green LED on, get message


check if your signal cable is properly connected to your system unit and make sure that non of the pins of your signal cable is broken.if any of the pins are broken,try and change the whole signal cable and re-connect it again
after following the above instruction,reboot your computer
thank you for contacting as with your problems,you are always welcomed

Jan 26, 2009 | Dell UltraSharp 1800FP 18.1" LCD Flat...

2 Answers

Gateway 900g


I'm writing this using a recently repaired Gateway 900g. You may be correct about the power supply, as that was the problem on this unit. There was absolutely no response with this unit. No blue LED, no dim display. Nothing.

WARNING: BE SURE TO UNPLUG THE AC LINE CORD. THE POWER SUPPLY HAS DANGEROUS 120 VAC PRESENT IF LEFT PLUGGED IN. If you don't know what you're doing, it's best not to attempt a repair!!!

Disassembly is a bit tricky, and there's a variety of different sized screws used; so keep track as you go. First you remove the front bezel (be careful as the two control boards on the lower right need to be disconnected). There are two screws (lower left and lower right) that secure the shell, the rest of the frame is just a snap fit around the perimeter.

Then remove the 6 screws that hold the LCD frame to the rear plastic shell. Careful here as well, as you must disconnect the back light cables AND the signal cable to separate the LCD from the Power Supply / Signal Processing board.

The Power Supply board mates to the Signal Processing board thru a 2x5 pin header. This contains convenient points to check the +12V and +5V supplies. In my case the +12V was OK, but the +5V was reading about +2.5V...not good! THIS IS REALLY DANGEROUS TO CHECK AS THE 120VAC IS ONLY AN INCH AWAY.

Here was the key symptom on my unit. Your's may not be the same. If I disconnect the Power Supply from the Signal Processing board, then the +12V and +5V read correctly (as well as the +16V that goes to the Backlight Inverter section).

However, once I connect the Signal Processing board, the +5V drops to +2.5V. However, the Signal Processing board seems to run correctly off of an external supply drawing about 300mA.

On closer inspection of the Power Supply board, I notice that 4 capacitors had buldging tops (domed). This indicated some stress. These were capacitors C205, C206 (470uF/25V) in the +16V section; and C210 (470uF/25V) and C209 (220uF/25V) both in the +5V section. I didn't have a Capacitance Meter handy, so it was simpler to just replace all four parts with similar values. (There's a lot of latitude in making these substitutions.) But be sure you have voltages a *least* greated than those needed; i.e. 16V or 5V. They used 25V to have plenty of headroom.

After replacing the 4 Capacitors, the Voltages and Blue LED responded normally. After reconnecting to the LCD assembly, all was well. Reverse the disassembly process, and you are ready to go.

nateoceanside@hotmail.com

Aug 06, 2008 | Microsoft ChiMei CMV938D 19" Widescreen...

1 Answer

IT USED TO RESTART ABRAPTLY BUT NOW NO DISPLAY


Hello Arua

I would suggest you get your hands on a 4 digit post card to diagnose the problem

heres one
http://cgi.ebay.com/PC-DIAGNOSTIC-CARD-4-Digit-PCI-ISA-POST-Code-Analyser-N_W0QQitemZ130196339829QQihZ003QQcategoryZ162QQcmdZViewItemQQ_trksidZp1742.m153.l1262


  • Determine defects by difference sounds coding with build-in speaker.

  • It can diagnosis the motherboard signal which show the problem of CPU, Memory, video card, etc.

  • The POST code display is made up of a dual, dot matrix hexadecimal read-out that display's Power On Self Test (POST) status codes

  • Support the power source working indicator -- +5V,+12V,+3.3V and 12V(When indicator LED is on to indicate its respective power is fine, otherwise to indicate its respective power is failure.)

  • Fully compatible with any kind motherboards which has the PCI and ISA bus slot.

  • If this solution was any help at all please press accept or ask more questions with the other button.And if you need anything else let me know, you can ask me 24/7 by clicking
    on the ask me button, I will ansver in most cases within 24hours.

    Thanks and good luck!

    May 05, 2008 | Intel D845EPI (INTELKD845EPILPAK10)...

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