Having problems with your Dell Dimension 4700 PC Desktop ?

Beep problem Dell Dimension 4700

\015 I have similar issue. It's the second time around. Earlier this year, it happened to my Dell Dimension 4700. It boots,\015\012but the monitor doesn't. I get 6 beeps like 1 234 56. Then the AB\015\012lights are yellow and the CD lights are green. Needless to say the fan goes out of control. Techs came to fix it, and all I know was that they changed memory cards, later HD and at the end the motherboard. But no explanation of what was causing such problem. Now, I'm having the same problem. Can anyone help me\015\012figure this out. I tested HD and it is working, changed memory cards and beep still going. Thanks for the help in advance\015

Answers :

Beep problem update - Dell 4700. Last night started computer - cold boot. The screen had just started to light up and then went black and computer started beeping in an interrupted sequence. Fan speed increased considerably (suggesting overheat?) Shut it down and attempted two restarts with no success. This morning I unplugged all cords, opened case, pulled and reset memory cards and vacuumed inside. The computer was very clean so really don't suspect that dust was an issue. Buttoned it back up plugged in plugs and restart successfully accomplished. Have no clue why. Some square electrons, I guess.
My 4700 has the same symptoms: on power up, I can hear the hard drive starting to spin, but then the fan goes to full throttle. The PC just sits there with the CPU fan ready to take off. The diagnostic LEDs are all off. Previously the PC would start normally every other time, so I thought the fan was the problem. I replaced the fan and yes, I found out the fan on the 4700 was installed wrong at the factory. I corrected that with the new fan, but that did not solve the problem. Now, I has gradually gotten worse to the point that it now rarely powers up normally.
I took the whole thing apart looking for suspicious solder joints, or puffy capacitors, anything. Vaccumed everything, reassembled, still no cigar.Then I started checking all the ICs for one that could be doing the fan control. I found that this IC marked LPC47M584 has some fan control functions. Unfortunately the manufacturer, SMSC, does not have the datasheet anymore and Google was of little help. Doing a continuity check, I found that two of the pins in the CPU fan header connect to this IC (besides ground, which is the middel pin). I "refreshed" the solder connections to this IC, reseated everything, but still no solution. I figured the next step is to replace the motherboard, so I ordered a brand new one. It will be here next week. I'll let you know what happens. -Tony
Repair Help & Product Troubleshooting for Dell Dimension 4700 PC Desktop

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