How do I determine if it is a TTL port?...

I sent the "official" repair centre an email and this is the response they sent me. [ATTACH=JSON]{"data-align":"none","data-size":"small","data-attachmentid":3217473}[/ATTACH]...

So, not being near as savvy as you guys and having only rudimentary skills and equipment, I am beyond appreciative of your helping me out this issue. Thanks heaps.

With my el-cheapo multimeter on diode mode (I think this is what I read as a very basic means of testing a transistor) I tested the collector and emitter sides of Q12 (it has "CR" on it). The readings I got mean nothing to me but to those in the know, it may; one side, I assume the collector, I got a reading of 1577 and then lost the reading altogether. Tested several times and the same thing happened. Other side...

Haven't had a chance to give the IC-freezing a go yet, will get some on the weekend and report back. The regulators do stay on when the LCD craps-out. I forgot to mention that when the unit is powered-on, it goes through what appears to be a self-test sequence and when the LCD was functional, the characters would display counting down from 0 to 1 and then audibly beep. It still does this sequence sans LCD output - assume this means that the MCU is still functioning in some capacity?...

Reading of 9.19V before and after



Yep, dead-on 5.00V across C13



Across C20, I get 2.50V. None of the regulators are at all hot.



The unit is two separate components; the powder dispenser and scale are stand alone units (as much as the dispenser requires the scale as a controller). As per the URL you added, the dispenser has its' own PCB that I fortunately, have not had an issue with.

The 6V regulator appears to connect to C14 then C12 then C31 then C9 then to U2, for what it's worth. CN4 connects to the...

Checking the PSU plug, I get 9.19V, which is the same as the voltage that I get on the 6V regulator input. At the output of the regulator, I get 6.04V....

Hi mate. Thanks for the input. Being a complete newbie, where would I look on the PCB to check the voltages?



The board appears to be entirely covered with a gel-type coating; water-proofing or antistatic perhaps?...

Okay. So, heated the caps with a hot air gun set to 100°c and unfortunately the issue persists although, the characters did appear to appear for a slightly longer period of time on the LCD

Thanks mate. Will do in the morning and report back....

Good morning all.

I have an RCBS Chargemaster 1500 combo electronic scale/powder dispenser that I have been using without issue for 15 years or more. I powered her up to do some reloading the other week and the LCD panel backlight & characters lit-up and then immediately, the characters faded-out, leaving just the backlight illuminated. I thought it may have been a one-off so, I tested again (and again...), with the same result.

I separated the scale from the dispenser and disassembled the scale. Nothing obvious observed that could be causing the issue, caps look...