Re: [Elecraft] Still blank display
[EMAIL PROTECTED] wrote: In a message dated 18/03/05 17:35:05 GMT Standard Time, [EMAIL PROTECTED] writes: Thanks for all the help on my blank display problem. I've followed everybody's suggestions. I even resoldered every point. Roland, Check that you have soldered pin 1 on U1, the display driver on the front panel board. A common mistake is missing this soldered joint. I made the same mistake and it can be seen without removing the display. Fixed mine without removing the display, though does need a steady hand. Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com I should have added if it wasn't clear that you need to remove U1 before trying the heated socket procedure. -- R. Kevin Stover ACØH K2/100 #4684 Reclaim Your Inbox! http://www.mozilla.org/products/thunderbird ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
RE: [Elecraft] Still blank display
R Kevin Stover wrote: ...If some of you will recall, I picked this up with the front board and control board complete. I carefully (or so I thought) retraced every step in the manual and am up to phase 1 of the testing and calibration... - Was the MCU (U6) installed in that control board when you received it? If so, the entire board needs to be treated as an ESD Sensitive device since a number of the pins on U6 are hanging open at the connectors when it's out of the K2. And ESD damaged chip will produce all manner of weird results. Indeed, U6 might not be the only IC exposed to that sort of failure with the board unplugged. A treat the boards just like I would any sensitive chip when they are unplugged. Don't forget, you have Elecraft service to lean on if you choose. Gary has all the resources to check and debug the board. Ron AC7AC ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
Re: [Elecraft] Still blank display
In a message dated 18/03/05 19:27:35 GMT Standard Time, [EMAIL PROTECTED] writes: I should have added if it wasn't clear that you need to remove U1 before trying the heated socket procedure. --- Think I must have removed the chip before soldering the joint, but cannot be sure a year later. Being on the bottom side of the board it is accessible in any case, though could be difficult to refit as the LCD display prevents you supporting the board at the opposite side to apply pressure. As you cannot get at U1 pin 1 on the top side of the board due to the LCD display, without removing this the method is to shave a V off the edge of the plastic corner of the socket at pin1 with an Exacto knife or similar to expose a small area of the tinned print of the through hole in the PCB. Take off enough to insert a very small pointed soldering iron on the socket side of the front panel board and solder it quickly. Speed is the secret and small diameter solder/soldering iron bit. I have both so no problem doing the work. Bob, G3VVT ___ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
