Laser pointer discussion. Read/write reviews of laser pointers and laser pointer companies. Learn about all types of laser pointers and lasers





Welcome to Laser Pointer Forums! If you are looking for a laser pointer or want to compare different laser pointer companies, you may want to check out the LPF Laser Pointer Company Database. The link will open in a new window for your convenience.








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes
Laser Technology Laser Pointer Parts Lasers by Wavelength
Top 10 Laser Pointer Companies Laser Pointer Company Database Visible Beam Laser Pointers


One laser store meets all your needs

























Go Back   Laser Pointer Forums - Discuss Laser Pointers > Lasers > Tutorials, Help & Repairs



LPF List of Laser Pointer Companies (link opens new window)



Reply
 
LinkBack Thread Tools Display Modes
Old 02-28-2014, 09:33 AM #1
Marco Polo's Avatar
Class 2M Laser
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 613
Rep Power: 625
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Marco Polo Marco Polo is offline
Class 2M Laser
Marco Polo's Avatar
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 613
Rep Power: 625
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Default TIP50 power transistor failure

While working on my Metrologic HeNe laser I'm pretty sure I killed the TIP50 power transistor on the board. The TIP50 is an NPN power transistor rated at 400 volts and 1 amp. I ran it without its heatsink to see if it would get hot, and indeed it does. It needs/needed to be replaced anyway due to having two broken leads, but I'm wondering if the TIP50 has any kind of thermal shutdown that will reverse itself upon cooling, or if the it just dies when it overheats. I haven't seen any reference to such a feature in any of the data sheets so I suspect it doesn't have it.

I was hoping to ditch the heatsink entirely because it's part of the reason the transistor's leads got broken in the first place. I guess that won't be possible, however, considering how hot it became.

I suspect it's probably dead, because the laser shut off and then wouldn't power on at all, not even the power light. Turns out I popped the 750mA fuse, so seems like the component might have shorted out internally due to the excessive heat.

Not a big deal if I killed it, it's a 1-dollar part, can order them online. Plus, with a replacement part I can have the leads be longer, which would make them more resistant to being broken in the future.

Other thing I wonder is, do you suppose the HeNe power supply would still work if I replaced the TIP50 with an NPN power transistor rated at 400 volts but higher current, maybe 5 or 10 amps?


__________________

808nm : SkyLaser HL808 820mW
650nm : [C6] LPC-826 215mW - SkyLaser HL650 175mW - Radio Shack <5mW
638nm : Opnext HL63603TG 190mW - AtlasNova <5mW
632nm : Metrologic ML-868 <5mW - Uniphase 155ASL-1 HeNe 0.95mW
543nm : Melles-Griot 05-LGR-193-497 HeNe 2.4mW
532nm : SkyLaser HL532 w/ IR filter 200mW - Fasttech SD-301 120mW - Lazerer LZCS 105mW - Laser 301 custom mod 85mW - various Laser 301's
520nm : [C6] Osram PL520 110mW - SkyLaser HL520 50mW
450nm : [C6] Osram PL450 260mW - Lazerer LZCS 145mW - SkyLaser HL450 95mW - SkyLaser LP450 90mW
405nm : Laser 303 85mW - Laser 301 90mW

Radiant X4 LPM from Illumination Supply


CHEAP BATTERIES CAN KILL YOU - please read this thread to see the truth about UltraFire and other CRAP brands!

Last edited by Marco Polo; 02-28-2014 at 09:37 AM.
Marco Polo is offline   Reply With Quote







LPF List of Laser Pointer Companies (link opens new window)







Old 02-28-2014, 02:39 PM #2
COMMANDR's Avatar
Class 2 Laser
 
Join Date: May 2008
Location: Belvidere,Il
Posts: 320
Rep Power: 217
COMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond repute
COMMANDR COMMANDR is offline
Class 2 Laser
COMMANDR's Avatar
 
Join Date: May 2008
Location: Belvidere,Il
Posts: 320
Rep Power: 217
COMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond reputeCOMMANDR has a reputation beyond repute
Default Re: TIP50 power transistor failure

Sure, as long as the parameters of the new device are as good or better than the TIP 50.
Give it a try. :-)
COMMANDR is offline   Reply With Quote
Old 02-28-2014, 03:51 PM #3
The Lightning Stalker's Avatar
Class 3B Laser
 
Join Date: Aug 2013
Location: MI, US
Posts: 2,654
Rep Power: 716
The Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond repute
The Lightning Stalker The Lightning Stalker is offline
Class 3B Laser
The Lightning Stalker's Avatar
 
Join Date: Aug 2013
Location: MI, US
Posts: 2,654
Rep Power: 716
The Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond reputeThe Lightning Stalker has a reputation beyond repute
Default Re: TIP50 power transistor failure

If you're going to replace it with a different type, the MJE13009 is a good one to go with. They are pin
compatible and the 13009 is superior in almost every respect. They can be harvested from many different
SMPS devices and other equipment. I can even send you a couple if you PM me your address.
__________________
ALL NEW MEMBERS MUST READ THIS!!! --> http://www.laserpointersafety.com

"Where, now, is the way by which the light distributes itself" - Job 38:24

YouTube Channel
The Lightning Stalker is offline   Reply With Quote
Old 02-28-2014, 09:27 PM #4
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: TIP50 power transistor failure

I don't see anything in there to suggest it's the transistor. I hope you're not relying on "it got hot without the heatsink" as the source of your deduction, because that's like saying "I took the hamster's food away and he got hungry, so the hamster is defective."

You said the fuse blew. Start there. Is the input shorted? If so, find out through what.
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Old 03-01-2014, 02:16 AM #5
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: TIP50 power transistor failure

First thing I would do would be to remove the transistor and see if it is internally shorted! If not, then find the short on your board.
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 03-01-2014, 05:32 PM #6
Marco Polo's Avatar
Class 2M Laser
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 613
Rep Power: 625
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Marco Polo Marco Polo is offline
Class 2M Laser
Marco Polo's Avatar
 
Join Date: Nov 2012
Location: Ohio, USA
Posts: 613
Rep Power: 625
Marco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond reputeMarco Polo has a reputation beyond repute
Default Re: TIP50 power transistor failure

What else would it be? Laser was running just fine, then it quit. Nothing changed, except the transistor smelled like it was burning up. It was so hot I couldn't touch it.

ETA after post: I wasn't running the laser inside its case, I was running it on the ceramic tile countertop. Totally dry, no metal anywhere, no water. I made sure of it before I ever set the unit there. End edit.

I did do a basic resistance test from lead to lead on the transistor and all I got was a dead short. I made sure that I wasn't contacting the test probes.

I'll check the rest of it though, just to be sure.

Regardless, the transistor was damaged due to its broken leads, which presented a strong argument to replace the part altogether. I know that I can wire it up better than it was, such that damage via mechanical jolt would be virtually impossible, so I believe I will go ahead and do that.

Definitely do appreciate your concern though, and if anyone has any more advice on the matter I will gladly take it. I want to LIVE, after all.
__________________

808nm : SkyLaser HL808 820mW
650nm : [C6] LPC-826 215mW - SkyLaser HL650 175mW - Radio Shack <5mW
638nm : Opnext HL63603TG 190mW - AtlasNova <5mW
632nm : Metrologic ML-868 <5mW - Uniphase 155ASL-1 HeNe 0.95mW
543nm : Melles-Griot 05-LGR-193-497 HeNe 2.4mW
532nm : SkyLaser HL532 w/ IR filter 200mW - Fasttech SD-301 120mW - Lazerer LZCS 105mW - Laser 301 custom mod 85mW - various Laser 301's
520nm : [C6] Osram PL520 110mW - SkyLaser HL520 50mW
450nm : [C6] Osram PL450 260mW - Lazerer LZCS 145mW - SkyLaser HL450 95mW - SkyLaser LP450 90mW
405nm : Laser 303 85mW - Laser 301 90mW

Radiant X4 LPM from Illumination Supply


CHEAP BATTERIES CAN KILL YOU - please read this thread to see the truth about UltraFire and other CRAP brands!

Last edited by Marco Polo; 03-01-2014 at 06:06 PM.
Marco Polo is offline   Reply With Quote
Old 03-01-2014, 11:41 PM #7
Sigurthr's Avatar
Class 3B Laser
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Sigurthr Sigurthr is offline
Class 3B Laser
Sigurthr's Avatar
 
Join Date: Dec 2011
Location: Michigan's U.P.
Posts: 4,382
Rep Power: 873
Sigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond reputeSigurthr has a reputation beyond repute
Default Re: TIP50 power transistor failure

Be sure your mains is wired correctly and that hot and neutral aren't reversed at the socket. Likewise check the plug on the laser isn't reversed.


Sent from my iPhone using Tapatalk
__________________
Amateur Multispectral Photographer - [X-Ray, UV, Vis, IR]
Amateur Electrical Engineer
Autodidact
Tesla Coil Expert
Sigurthr is offline   Reply With Quote
Old 03-04-2014, 02:36 AM #8
Cyparagon's Avatar
Class 4 Laser
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Cyparagon Cyparagon is online now
Class 4 Laser
Cyparagon's Avatar
 
Join Date: Sep 2007
Location: Wisconsin
Posts: 9,142
Rep Power: 9321
Cyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond reputeCyparagon has a reputation beyond repute
Default Re: TIP50 power transistor failure

Quote:
Originally Posted by Marco Polo View Post
I did do a basic resistance test from lead to lead on the transistor and all I got was a dead short.
While removed from the circuit, yes? Then it's dead. Might be a failure of the transistor, or it might be whatever drives it though.

What is the resistance on the mains input?
__________________
A problem well stated is a problem half solved.
Cyparagon is online now   Reply With Quote
Reply





Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On











Loading








Green Laser Pointers by Category Blue Laser Pointers by Category Red Laser Pointers by Category
Yellow Laser Pointers by Category Violet Laser Pointers by Category Orange Laser Pointers by Category
Top Laser Pointers by Power - 1 Watt+ Top Laser Pointers by Power - 500mW+ Top Laser Pointers by Power - 250mW+
Laser Pointer Database High Power Laser Pointers Laser Pointer Diodes






Privacy Policy | Advertising Disclaimer | Terms of Use


 


All times are GMT. The time now is 12:21 PM.


Powered by: vBulletin
Copyright ©2000 - 2017, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO
Privacy Policy | Advertising Disclaimer | Terms of Use
Copyright (C) 2017 Laser Pointer Forums, LLC