CurtPalme.com Home Theater Forum

[incova]

There are two black mosfets I think, one has a large ( compared to it ) metal plate above it between the LVPS casing and the mosfet, this helps clear the heat I presume like a little heat sink. The other mosfet has nothing I dont think it even touches the case and without the clamp it cannot touch the case. Should i add some computer thermal paste to the top of this mosfet and then use the clamp to secure it?

After that I will connect the pc then the dvd player to see if there is a difference.

[incova]

Ok, I have never connected a dvd player to any pj what lead do I need for this, my dvd player has a scart at the back and video out and digital out. Whats the best option. I intend to connect the dvd player directly to the pj if possible as its just for testing is this possible? I only have RBGHV at the back of the ampro to work with.

[papalek]

[incova]

I separated the two parts of the lvps and I cannot see a solder problem anywhere, just very dusty but I cleaned that out. everything looks good. I just need a new nut for the clamp.

i want to try a different source so I can ascertain wether its the cable or the pj as well as rule out the htpc, although I think if the htpc had a fault it would show up on the monitor.

If I can rule out the cable then htpc then the lvps I may narrow it down hopefully. I think the lvps may be a problem though.

[incova]

Ok, this is interesting the screw can hold it in place without a nut it just must have got loose over time. Hopefully that means theres no nut problem, apart from myself, here.

[incova]

There is still hum in the picture just not as obvious, also the pj seems ok at 1024 768 by 60, I hit code 36 and it was locked on it only jumped a little. I left itt on that resolution for 20 mins and it seemed stable. I then switched it to 1440 960 by 60 which I have been using the past couple of months and ten seconds later the pj shut of, code 36 also showed that it could not hold the incoming signal like it could 1024 768. There is a definite correlation between the resolution and the locking and the pj shutting of.

I can only think that the higher resolutions are either making the signals too hard to read properly, which would be strange as they were fine the last two months or that the higher power needed for higher resolutions is leading to a power loss in the pj which leads to power loss and shutdown then auto restart. Does this seem logical?

[papalek]

Yes it is logical. Do you have a different cable you can try?

[incova]

I have a couple I will give them a try, I paid a a lot for the cable thats in there now so thats plain annoying if its the cable but it would be a easy fix.

[incova]

I checked the cpu led s and all the corrrect ones are on thats 35, 43, 45 so when I switch the cables if it does not stabalise I will code 30 the setting put the resolution up and see if I can catch what happens before it shuts down.

[incova]

its stable at 1024 768 at 60, no hum no problems nothing, I changed the cables but no signal even comes through with other cables this seems to be the best one. At higher reses the pj s tone changes as the power ramps up then it shuts down. Any thoughts guys?

[incova]

Scott asked me to run it with cables of and no input, it ran fine then I was told to try it on 3 test with crosshatch, which is a slightly higher frequency than 1440 960, it again ran fine. The numbers on the code 36 for test 3 looked strange though 62500 - 61, then it went every few seconds to 373800 - 61 but most of the time 62500 - 61 was the main number when code 36 was on with no input on test 3 with no cables. The pj was fine and stayed on for 2 and a half minutes with this test. I didnt want crt burn so I then shut it of.

[tse]

62500 - 61 is the right reading when in 3 test. The other number is just a glitch if the picture (crosshatch) is stable. You can safely run the projector at this frequency if you turn the contrast down to a very dim picture.

1440x960@60Hz is a horizontal frequency of 59 or 60KHz and vertical frequency of 60Hz. The internal 3 test is a horizontal frequency of 62.5KHz and vertical frequency of 61Hz. Very similar. Doesn't make sense that internal works and external doesn't. Can you try an external 1280x1024@60Hz? That is 63 or 64KHz at 60Hz. The projector should like that just fine.

Scott

[incova]

I will try an external 1280x1024@60Hz, what you are saying is that the numbers jumping are just a glitch not a reason for the problem then Scott I take it.

[incova]

ried the external 1280x1024@60Hz and the pj is fine with it but there is massive hum in the picture, the lines are back again, I swtched the pj back to 1024 768@60 and the hum is in the form of huge black zones in the pictre, I had none last night.

[incova]

1440 960@60 the pj shut down as soon as I used this resolution.

[stefuel]

I assume you are using a HD-15 X RGBHV breakout cable. Make sure you have no bent pins on the HD-15 end of the cable or bent pins on the BNC ends. The fact that it works with no cable connected tells me that it's in the cable or PC.

[incova]

No bent pins, thanks Chip, nothing I can see damage wise, the other two cables I used dont even seem to feed a signal to the pj. I tried the test SCott advised again, with no inputs in the pj is fine on test 3 so I assume you are right it may be the computer not the pj or the cable. Just something I find weird though would nt this do the same thing to my monitor, my monitor works fine, it uses a different plug and lead, but if it were the computer wouldnt the monitor be a problem. Anyway, I will get my mate to bring his pc and we will try it and see what we can come up with.

[incova]

Perhaps the signal cannot be read by the rgb card, this would explain why the pj is ok when there is no input even at high frequency tests. Could the rgb card be causing the problems, is this possible for it to shut down the pj if it were?

[incova]

K this is bad,, I put in a power conditioner to see if it would clear the hum, I put the pj on and wanted to see if the hum was gone, I could not see a thing. The pj contrast was set really low I put the contrast up and saw no blue in the pic and the pic everywhere the settings were all gone and picture was way out it was a totally warped square shape for the two tubes. The pic was not even like a code 29 it was all over the place, when I pressed size the size said 300!! when I tried bringing it down
it just went back up to the size it was. The red light for registraion was also of on the cpu board. I shut it down and have given up I have no idea whats going on. Code 30 showed no error codes and I really dont want to risk the other two tubes although looking at the warped pattern I saw they may be pretty mucked up as well.

[papalek]

Remove the power conditioner and try again. It may not like what the power conditioner is sending out.