CurtPalme.com Home Theater Forum

[sj64]

Well, each week seems to bring a new problem - a new challenge.
Last week finally fixed a problem with a the blue shifting around. Found a dry joint, plus a few others on the DC board, fixed them and then it was great for about a week.

Now I've got the 1252 shutting down within a second of starting up with an 08 error code. This a V-STOP problem. I've read this is related to the DC, DE, and DA boards or the PSU. As suggested in other posts on this problem, I've tried reseating the CPU boards and all connectors on the top two boards. Nothing.
To avoid spot burn risks, I unplugged the HV lead from the HV transformer that leads around back to the splitter.
This time when I switch on the pj, the error code '08' flashes three times before settling on '00' and the pj stays powered on.
I haven't put the HV lead back in yet to see what happens next.


Whilst the pj is staying powered, is there any testing I can do? Having and using a volt meter is about the extent of electronic know-how.


Also, when it comes to putting the HV lead back in, do I need to wait a certain length of time, or possibly use a screw driver to clear the residual charge that's built up around the connection at the top of the HV transformer. Or is the 'frightening sparky noises' I hear last time I put the HV lead back in of no consequence?


Briefly:
-When I first got the PJ, I noticed that the 08 error code would always flash 3 times and settle to 00 as the pj powered up. A month of that and then the PJ wouldn't start at all with a permanent 08 code showing.
-I reseated the cpu boards, fixed the V-STOP problem, but then there was no image being displayed.
-Sent the pj to a technician, finally came back after he fixed the no image issue and replaced a blue video ICH chip.
-Noticed that error code 08 now flashes just once before little display goes blank, as projector starts.
-Problem with blue image randomly shifting around developed, fixed by finding dry joint(s) on DC board.
Here we are now.

I'd welcome any thoughts on the problem.

'cheers
SJ.

[tony359]

Uhm, I would not put a screwdriver in the HV holes!

I'm not sure, I would wait a while before plugging again the HV plugs.

About 08, it's normal that the set shows it briefly (1-2 seconds then disappears). It's odd that the set is working without tubes connected.

Ciao
A

[sj64]

Hi Tony359,
I searched these forums about V-STOP problems, and I think it was Curt who said to disconnect the HV lead to the tubes because a V-STOP problem is usually on the same boards that can potentially cause a spot burn if they're faulty. Set runs fine without the HV lead connected to the splitter at the back - simply that the tubes don't light up.

I know that when my set was working well, the '08' code would flash once and then disappear. Now however with HV lead disconnected it flashes 3 times before settling on '00' and staying on. Which is the same behavior as when I first had the pj -where it eventually refused to start up displaying a permanent '08' code.

I've been pulling the boards out one by one. Starting with the top two boards and then the CPU boards. Eventually I 'spose I'll even try taking the PSU apart. However if I can't find any dry joints or obviously blown caps, I'll be at a loss.

Anyone have any other suggestions?

'cheers
S.

[Curt Palme]

That's about all you can do, swap boards. Usually it's one of the two large boards, but you might also hvae LVPS or CPU problems.

[Curt Palme]

That's about all you can do, swap boards. Usually it's one of the two large boards, but you might also hvae LVPS or CPU problems.

[sj64]

Hey all,
I might be able to pick up a 1270 with a non-working green for spares.

Sonynut's been good enough to list the boards that can and can't be swapped on 12xx pjs.
But what about LV and HV power supplies and the HV splitter stuff?

'cheers
S.

[sj64]

Okay so now it's a 'H-STOP' (100V down) problem.

I had the E board and the PA board out this morning. Found a two possibly bad connections, re-soldered them. Even opened up the PSU and blew all the dust out of it.

Plugged it all back in and hey - it worked. So I decided to leave it running for a while with no input, just a blank screen. Went out of the room and came back half an hour later and the set had shut itself down and was displaying an '02' error code - which means H-STOP. (100V down)

Someone else over on AVS forums is having the exact same error message at the moment, which Sonynut responded to and gave me something to look for.
http://www.avsforum.com/avs-vb/showthread.php?t=1004229&highlight=%2Berror+%2Bcode


-First thing I did was unplug the pj, then restart it again. Straight away somewhere on the set was this high pitched 'ping' noise. Set shuts down and displays error '02'.
If the 'ping' noise is where the fault is, would it be a bad idea to repeatedly start the pj up, to try and locate where the noise is coming from.

Also on Sonynuts suggestion one of the possible problems is a transistor on the E board. When I found it I realised it's one of those transistors that's on the right edge pushed up against the heat spreader that's normally there. However I had left it off.
In that half hour could this resistor have overheated and died? Is there a way I can test the resistor?

For replacing it, I saw that the numbers printed on the transistor don't seem to have any relation to what I found in the service manual.

'cheers
S.

[mike calcott]

I had a similar problem, I found that one of the transistors was not making good contact with the heat sink. after reaplying heat sink compound and seating the transistor with good contact with the heatsink the problem has not reapeared

[sj64]

Hi Mike,
sounds promising. How similar was your problem?

p.s. (Mainly I was wondering did you also get a high pitched 'ping' noise? I always get a bit disturbed when electronics start making loud noises.)

2nd time I switched the pj on and got the 'ping' noise followed by shutdown, I had put the heatsink back and pressed the transistors firmly onto it. They'd also cooled down before I turned the pj back on.
But maybe I should try turning it on again tomorrow and hopefully will be better.

[mike calcott]

Make sure there is heat sink compound between the transistor and the heat sink