CurtPalme.com Home Theater Forum

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

Hello,

Turned my NEC 9PG on again since long time it starts up and shows normal picture, everthing seems alright but the two fans on the bottom don't start. After 30 seconds the machine shows "fan has stopped" and shuts off.

anyone knows what can cause this problem ?

best regards

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Hmmm, try reseating the system board a few times.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

Also is the 3rd fan running thats connected to the HV board?

**Curt Palme** · Posted: Tue Mar 30, 2010 6:30 pm Post subject:

Very unusual, never had that one before. Mac, I'm not sure that the system board controls the fans. Check all wiring on the motherboard under the system board (hard to do!), maybe something wiggled out? I have the s/manual, can check the fan voltage flow if you get stuck.

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

stefuel · Posted: Wed Mar 31, 2010 10:43 am Post subject:

Of course there's always a slim chance that both fans failed at the same time or one was replaced at some time with the safety bypassed and now the other one has failed. Wink

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

thanks for your answers but i've found the error. the pre owner installed some fan control circuits and anywho the two fan supply wires become loose and made a short circuit on blank metal. so a resistor on the mother pcb burnt away. it's not really easy to remove the mother pcb because i had to remove the green tube and many wires. i didn't get out the hv lead from the hv splitter so i didn't fully remove the green tube and as i work on the mother pcb i heard some crackle, here's a picture Sad

looks like i have to search for a burnt tube and change the glass

**Curt Palme** · Posted: Wed Mar 31, 2010 1:46 pm Post subject:

That resistor will be the same as the ones beside it, 2.2 ohm, 1 watt.

Now you know why I hate aftermarket mods that aren't done right. It causes problems like this.. Sad

**Curt Palme** · Posted: Wed Mar 31, 2010 1:50 pm Post subject:

Also, I should have a burnt tube, no charge, but it will be $65 or so to ship. Otherwise I could smash the neck of the tube and just send the front part, I'm guessing that will be $35 or so.

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

ok sounds nice, but i first check if i can get one in europe ... i also have burnt 180dvb22 tubes but think the glass is to big

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

I'm not baffled anymore...... Smile

macgyver655 · Joined: 22 Aug 2007 Posts: 8508

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

i can look that up in the service manual or measure it, no problem.

but does anybody know how to get out the hv lead from the hv splitter, that i can pull out the tube ?

stefuel · Posted: Wed Mar 31, 2010 10:22 pm Post subject:

Mark_A_W · Posted: Fri Apr 02, 2010 11:56 am Post subject:

Bleed your other tubes.

Changing the glass isn't hard, just time consuming.

Use turps, drain the glycol on the donor tube, and fill the chamber with turpentine.

Wait a day or two.

Cut the glass off CAREFULLY with the thin razor blades with a folded backing edge. (For paintscrapers.)

Just use regular black acetic cure silicone (the vinegary one) to reattach the glass.

And you pry the HV boot up carefully by lifting and pushing the edge of the boot - it pops over a ridge and is hard to remove. Use the round shaft of a screwdriver (not the tip) and don't scratch the splitter, or the HV will come out and it's REALLY LOUD!

**Curt Palme** · Posted: Fri Apr 02, 2010 1:30 pm Post subject:

the_maniac · Joined: 10 Jul 2009 Posts: 111 Location: Austria - Europe

thanks very much for the explanation, got the boot out but it was really really hard ...