On Tue, 11 Aug 2020 03:54:01 -0400, bitrex wrote:

On 8/11/2020 3:41 AM, bitrex wrote:
Problem with my Tekpower PSU:

https://tekpower.us/downloadable/download/sample/sample_id/1/

Here's a teardown on YouTube:

https://youtu.be/Nfe28vGW6Ik

Problem is it's developed a fault where the current meter always reads 0
when in constant-voltage mode. Everything else seems to work fine and
it's putting out the right voltages, current limit works fine, when load
current exceeds the set point it current limits OK and shows the correct
value. Drop back and the display reads 0, again.
snip

Have you replaced the OP07?

Could be one output is unable to pull in one direction.

Or N18A . . .

Biasing to V13 doesn't look right, in the schematic, so
you may have to deal with some typos there.

RL