Electronics > Repair
Weller WD1 Discussion and Repair
CryoME:
Hi All,
I am new here, I got a Weller WD2 station. does not work, PIC18F66222 chip seems burnt. I can replace it with a new chip but I dont have microchip programmer. Is there a way to reprogram it wih the weller usb port? does anyone has a hex file for the weller WD2/M?
Thank you!!!!
Khaveer:
I've managed to dump firmware from both revisions of WD1 stations. I hope someone will find those useful.
stenzer:
First of all hi everyone,
I'm following the EEVblog forum for several years as a guest, and of course I'm watching dave's videos regularly.
As I got my hands on a dumped Weller WD1 for 20 € I thought I will give it a try, as there was no stated/indicated error.
By powering up the solder station without a soldering iron attached I get the first attached image below, which looks good to me at first glance.
Should the display should show even more during powering up?
After powering up, the display shows the icons in the second attached image.
As far as I can remember, the display should show at least the three set temperatures (I, II, III). So it seems something is messed up.
I measured the 12 VAC as well its rectivied ~16VDC representation, used to power the front/display PCB. I measured the output voltage of the 7805, which is bang on.
When I'm pressing both error buttons (both buttons to the right of the display) for 2 seconds or 4 seconds, I'm not able to enter the setup mode for setting up the special functions, as described in the manual.
So I assume the MCU (PIC18F6622) is somehow damaged, although I cannot see any physical signs that the MCU has been damaged, see third attached image.
Can someone tell me if it's the MCU? I have seen in reply #66 there is the appropriate HEX file available. I have a PICkit 3, so flashing a new MCU or "reflashing" the current one shouldn't be a problem.
Is there something I have to keep in mind during flashing, or has anyone experience with the provided HEX files (do they work as expected)?
I would appriciate any advise.
BR
PS.: it seems I'm not able to insert the images within the text.
stenzer:
Hi,
I was able to take some pictures of the display of a fully functional WD1.
The first attached picture shows the display during startup and the second one when fully powerd up.
As can be seen, both pictures are taken without a soldering iron attached.
I already reflashed the MCU. Still the display is half blind. Afterwards I tested the WD1 with a LR21 solder iron and it is getting hot. I'm able to change the temperature as well.
Next step was measuring the voltages at the individual LCD pins turing power up. I was able to measure a voltage of ~5 V at each pin for a short time during powering up. So I think the LCD display got damaged.
Does anyone know if there is an approproate replacement display available, or the datasheet which shows the pin assignment to the individual segments? I would like to exclude the PCF8576 LCD driver.
BR
stenzer:
Hi,
as the display seems to be broken I would like to connect the solder station with my PC. Therefore, I would need the firmware for a WD1M with a PIC18F6622.
I measured the communication signal levels at the pins of the PIC18 (connector X3) with the WD1 (non M) firmware, and there is nothing going on (RX: permanent 0 V; TX: permanent 5 V).
So if someone would be so kind to provide the firmware for the WD1M with a PIC18F6622.
THX & BR
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