Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20  Location: Berkeley, CA Thanks: 3 times
|
Built HD and HD PBP at the same time; just tested them. BP is working just as expected, but the HD is not working correctly. All LEDs lit, checked all 550 and 560 transistors (for orientation and solder joints), resistors, solder joints on everything. Twice.
These are most basic measurements, and I can provide photos and more measurements as required.
V in 10.85V AC
DC in 13.45V (TP GND1 & TP VIN)
V out is about 4.05 cold, then lowers to 3.9ish; turning VR2 has no effect at all on V out.
TP V REF is 3.87V which is correct I think.
CSS measures 0.00
Any suggestions where to look?
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 6/17/2008(UTC) Posts: 921  Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
|
Check orientation of D1.
Upload a snapshot.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20 Location: Berkeley, CA Thanks: 3 times
|
I'll send photos this evening (8 hours or so). D1 is correctly oriented (from memory, I spent a lot of time looking at this yesterday...) Are there specific photos, or just a lot of close ups of top and bottom of board? And—thanks for your help!!
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20 Location: Berkeley, CA Thanks: 3 times
|
Here's some close ups. I went through all transistors again this evening to make sure that none of the n & p were switched. The solder all looks good to me, but if any seem suspect, please let me know. I'm pretty cautious with using heat sinks on all semiconductors, but still might have burned out something. Is there a schematic that has voltage points noted around various components that could help me try and isolate where I've screwed up? picovolt attached the following image(s):  DSCF2772.jpg (90kb) downloaded 29 time(s). DSCF2771.jpg (103kb) downloaded 25 time(s). DSCF2774.jpg (77kb) downloaded 32 time(s). DSCF2776.jpg (107kb) downloaded 31 time(s).You cannot view/download attachments. Try to login or register.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 8/24/2012(UTC) Posts: 2 
|
What mv is the value between tp-vin ~ tp-ccs? You can try to tune VR1 about 100mv and adjust the VR2 for the the 5V. If the output is over 5V and can't adjust down, can try to replace the R7 for 4K.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20 Location: Berkeley, CA Thanks: 3 times
|
I get 0.00 mv between CSS and Vin. Changing the VR1 doesn't make any difference. My output also can't be adjusted, and is near 4V.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 8/24/2012(UTC) Posts: 2
|
It could take long time for troubleshooting, in my not professional opinion, I would recommend to replace all 550 and 560.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
|
Some of your soldering looks dry to me. Are you sure they a good contact ? Try re flow the whole board. avr300 attached the following image(s): cut.JPG (146kb) downloaded 38 time(s).You cannot view/download attachments. Try to login or register.
|
 1 user thanked avr300 for this useful post.
|
|
|
|
Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20 Location: Berkeley, CA Thanks: 3 times
|
Thanks avr—I'll get to this is either tonight or Friday night. Will let you know if that does it. If not, I think I'll pull the transistors one by one and replace them.
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 4/1/2013(UTC) Posts: 20 Location: Berkeley, CA Thanks: 3 times
|
AVR—you were been right about the cold joints. I re flowed the board and kept testing it to see where the problem joint was. It was at R9, which had wicked through a fair amount of solder, but was still dry. In any case, it adjusted fine, and I've got my BIIIse and Legato up and running for the first time! Now to order the WaveIO and move up from toslink. (Have been waiting for TP board, but my sense is it could still be awhile longer.)
Thanks again!
|
|
|
|
|
|
Rank: Member
Groups: Member
Joined: 6/17/2008(UTC) Posts: 921 Thanks: 1 times
Was thanked: 70 time(s) in 69 post(s)
|
You're welcome. Glad I could help. ;-)
|
|
|
|
|
|
Forum Jump
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.
