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Discussion Starter · #1 ·
Can you help me?


Hi,


At the “power on†my NEC 6PG go in STD-By mode and show “F8â€

Only if I lift the CA connector on the C drive, the pj power on correctly.

After a few seconds, I turn off the PJ and reconnect the CA, then I switch on and the PJ are ok!


After this, If I leave it on std-by mode, I can switch-on and switch-off many times and the PJ work correctly. But if I remove the power cord or switch off the Power button, and leave many hours off, When I try to switch-on, after a few seconds this go in std-by mode and shows “F8†again!


The STK chips, on the C drive looks ok, I replace them last year.


What I can do??


Thanks in advice and......sorry for my english

:)


ciao


Marco
 

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Change them again, it's probably the same problem.


Curt
 

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Discussion Starter · #3 ·
Thanks Curt,


now I'm searching another couple of STK chips, and next week I try to change them.


But no understand because the pj, after a first time to power up, run correctly?


Is possible a problem in the stability of the DC voltage of the Power supply?


In other words, can a fault PS shows a "F8" error?


Thanks a lot


Marco
 

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NO, I have not seen that before. You need to make sure that you use a lot of heat sink compound between the chips and the metal, those chips run really hot...


Curt
 

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Discussion Starter · #5 ·
I've repalce the two STK chips on a C-Drive,

I replace a fews Rubycon black caps with a news Elna 105° too.


But the "F8" error continue flash!


If I lift the CA connector the pj runs well!!


How some more tests can I do???


Thanks


Marco
 

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I have a similar problem - C board works perfectly in another projector, but I get F8 error on the other *with the SAME C Board* I hope someone has an answer.

Otherwise Marco, check the solder connections on the rest of the board maybe?


I am seriously considering replacing the aluminium 'heatsink' plate on the bottom of the c-board with copper. The local engineering shop can make me up a copper plate to suit. This should drastically reduce the temperature at the STK chips. Would anyone else be interested in these? It may be cheaper to get a 'job lot' made up rather than just two.
 

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Discussion Starter · #7 ·
Thank you Dokworm,


unfurtunately I don't have any PJ and any C- board for testing!

I've tested the connectors on CA cable to the motherboard, and I check the solders but I haven't seen anything!


For the 'heatsink', I think to add one on the top of the PJ, over the C and F-drive, with the pj ceiling.


ciao!


Marco
 

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Discussion Starter · #8 ·
in another thread Curt Palme write:


"Check the power supply rails that go to that boiard, +/- 35 volts or so. They need to match, or there will be DC offset that will set off the F 8 error."


I test the voltages and at the pin 1 of the CP connector (brown wire) is -37,8vdc and at the pin 2 (white wire) is +36,9vdc.


These voltages are with te CP connector lift.


Can this cause the problem??


Thanks

marco
 

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Dokworm, did you sort that weird C drive error out? Was it the voltage regulator? Was this JSP's one or yours?
 

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It was the F board!?!? I don't understand why, but swapping out the F board solved the problem.

This was with the PG. not the plus.

I repaired JSP's plus C Board and got it working A-OK, and sent it back last week, haven't heard from him though as to how he went with it.
 
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