# Power Chart flickers / shows "No Trend Data Source" **URL:** \ **Category:** Ignition\ **Tags:** ignition83, perspective\ **Created:** [July 18, 2026, 5:30pm UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455 "2026-07-18T17:30:51Z")\ **Posts on this page:** 5\ **Page:** 1
**Author:** ![dixithgowdar1998](https://avatars.discourse-cdn.com/v4/letter/d/d78d45/32.png) [@dixithgowdar1998](https://forum.inductiveautomation.com/u/dixithgowdar1998)\ **Post date:** [July 18, 2026, 5:30pm UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455/1 "2026-07-18T17:30:51Z")
- - database provider → MSSQL connection (status VALID). - Perspective view: coordinate container, Power Chart, single pen - Pen source: histprov:MediHistorian:/drv:ignition-ut-ltp-1511:default:/tag:line/blending/blenderrpm - Pen is saved in view.json (verified via project export), not session-only - system.tag.queryTagHistory() from Script Console returns rows consistently (100 rows for last 10 min) while the chart is flickering. - sqlth\_te has the tag entry, sqlt\_data partition has rows flowing. - Same behavior after rebuilding the Power Chart fresh and re-adding the pen ---
**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\ **Post date:** [July 18, 2026, 5:40pm UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455/2 "2026-07-18T17:40:47Z")
I would guess that the history queries are running slower than the realtime poll rate. Slow that way down for troubleshooting. ---
**Author:** ![mmyzer](https://avatars.discourse-cdn.com/v4/letter/m/87869e/32.png) [@mmyzer](https://forum.inductiveautomation.com/u/mmyzer)\ **Post date:** [August 4, 2026, 9:43pm UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455/3 "2026-08-04T21:43:15Z")
I'm also having this issue, and I noticed a large number of 403 errors corresponding to data fetch requests (XHR). It is seemingly always exact 2 successes before another failure. Immediately after, a typeerror occurs and prints to console, presumably because the value wasn't returned. ---
**Author:** ![louagejasper](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/louagejasper/32/86311_2.png) [@louagejasper](https://forum.inductiveautomation.com/u/louagejasper)\ **Post date:** [August 5, 2026, 7:50am UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455/4 "2026-08-05T07:50:43Z")
If you're looking for a better performing Power Chart, I recommend giving this a watch: [![](https://us1.discourse-cdn.com/inductiveautomation/original/3X/3/f/3f28eed2ddb9ca710aa720cf1bb90dd5f8a9bc1c.jpeg "Ignition’s 8.3 New Historian API Explained (and how to use it)") ](https://www.youtube.com/watch?v=qWRpDiBvPmU) ---
**Author:** ![mmyzer](https://avatars.discourse-cdn.com/v4/letter/m/87869e/32.png) [@mmyzer](https://forum.inductiveautomation.com/u/mmyzer)\ **Post date:** [August 5, 2026, 1:05pm UTC](https://forum.inductiveautomation.com/t/power-chart-flickers-shows-no-trend-data-source/116455/5 "2026-08-05T13:05:56Z")
This fixed it for me: > [@\[Bug-6340\]Power Chart Flashing on Perspective Edge](https://forum.inductiveautomation.com/t/bug-6340-power-chart-flashing-on-perspective-edge/65995): > > I have a Power Chart view on my device running Perspective Edge that shows image 1 then quickly flashes image 2 for a split second then goes back to the first image for a second or so. I see this both in the designer and when running workstation. The only modification I made to the object is adding 1 tag (not specific to any single tag btw..) that I have logging to the edge historian. Without any tags selected to trend there is no flashing. No errors show in my logs. Any suggestions before I am … Spaces in the project name seemingly cause it