Repairing a blown fluro ballast TRIDONIC 2x58 T8 Part Number 22-185-227 - Page 1
Forum section: electronics / repair

author: juxtapos
author_rank: Newbie
timestamp: May 06, 2023, 08:54:40 am
content: My workbench ballast (TRIDONIC 2x58 T8 Part Number 22-185-227 Fluro ballast) has blown but im sure the repair would be simple if i had some more info on what is going on. Sorry i cannot find the schematic but it maybe obvious to those in the know what has gone on by looking at the damage.There appears to be some blown tracks but that must have been set off by some other failure.Image three looks like something WAS there once but blew itself to bits.If this looks familiar and can be repaired with some passive and easily available active components. Let me know.

author: cruff
author_rank: Regular Contributor
timestamp: May 06, 2023, 05:38:50 pm
content: That bridge rectifier chip looks a bit suspicious, a shorted diode in it could easily be the cause of the track damage.

author: james_s
author_rank: Super Contributor
timestamp: May 06, 2023, 06:14:59 pm
content: That looks like a mosfet with current sensing resistors, probably a flyback converter. I'd test the rectifier and the mosfet for shorts, and the sense resistors to see if they're open or have gone high.

author: juxtapos
author_rank: Newbie
timestamp: May 06, 2023, 10:18:43 pm
content: Yes the rectifier has a strange mark on it. Looks like catastrophic failure. Any ideas on what the annihilated missing component by the MOSFET was?

author: AK6DN
author_rank: Regular Contributor
timestamp: May 06, 2023, 10:21:01 pm
content: Rip the ballast out and replace the fluorescent tubes with LED based equivalents. No ballast required.

author: james_s
author_rank: Super Contributor
timestamp: May 06, 2023, 10:45:29 pm
content: Quote from: juxtapos on May 06, 2023, 10:18:43 pmIt looks like a capacitor, probably the same as the one to the right of it.Honestly this looks like a really cheap crappy ballast. You might get some fun out of fixing it but it's probably easier to just replace it.

author: juxtapos
author_rank: Newbie
timestamp: May 06, 2023, 11:20:36 pm
content: your right. it does look crappy. im thinking that too

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2023, 11:34:22 pm
content: Quote from: juxtapos on May 06, 2023, 10:18:43 pmI have almost exact same PCB from a dual 60" LED ceiling fitting....these are known to fail apparently and I believe can be sourced from Ali for some 20 odd bucks.Mine have no signs of failure and TBH I haven't had a chance to dive into them yet however they are a quite simple SMPS design.The SMPS controller is a X!tec 18036RAA ....yes that's how it is spelt !The white blob by the CC Mosfet is a ceramic cap and there should also be a black SMD series inductor nearby.By the look of your PCB it seems it may have got wet then fused going by the significant damage on it.

author: juxtapos
author_rank: Newbie
timestamp: May 06, 2023, 11:54:10 pm
content: the model i have is a TRIDONIC 2x58 T8 Part Number 22-185-227 Fluro ballast.I would replace it if i was like most ppl. But im obsesses with not throwing away equipment that has one or a few things wrong with it.I have had my dryer for 10 years and repaired it about 6 time. For the cost of 1/10th the price of a new dryer.we can just keep on buying complicated machinery and throwing it in the tip when a bearing goes on it.Im not a super greeny or anything but it just make no sense to me. (oh and i like fixing things which helps)

author: tautech
author_rank: Super Contributor
timestamp: May 06, 2023, 11:57:53 pm
content: Quote from: juxtapos on May 06, 2023, 11:54:10 pmAh, mine is a Tridonic CC 100-400mA LED driver that looks very similar, well the top side of the PCB does.Maybe you should add the model # to the thread/topic title.

author: juxtapos
author_rank: Newbie
timestamp: May 07, 2023, 02:44:29 am
content: good idea. done.