IR3300 Laser Unit

[Phil B.]

Re: IR3300 Laser Unit

Back when I was in electronics school we would use a logic analyzer, logic probe and an o-scope with data capture feature to troubleshoot most PC boards.

I remember an old trick when all else has failed. I've tired it with varying results. But I was just playing around on some old TV's. I don't really recommend this. You can put the PC board in an oven for about 5 minutes and sometimes it will work if you have a cold solder joint and can't find it.

Anyone ever heard of this?

yup old trick for us senior tech in this field also..... about 300 for 5min.


some of joke with the newbies/end users " Put it in your micro-wave oven for a minute or so " yup we can be very cruel


re: Tube monitors .. NEVER trust ANYONE to drain the flyback.. I did one time... I took 14,000v in the right hand out the right leg ( my leg was touching the metal frame of the work bench.. knocked me back 6+' onto a brick wall.. burned a whole in my poly pants and took my breath away... I was still shaking @ 1800hrs.... The next day I questioned Jesse ( other tech ) did you drain the flyback? He barely got YES out of his mouth before I punched him out cold.

[BillyCarpenter]

Re: IR3300 Laser Unit

yup old trick for us senior tech in this field also..... about 300 for 5min.


some of joke with the newbies/end users " Put it in your micro-wave oven for a minute or so " yup we can be very cruel


re: Tube monitors .. NEVER trust ANYONE to drain the flyback.. I did one time... I took 14,000v in the right hand out the right leg ( my leg was touching the metal frame of the work bench.. knocked me back 6+' onto a brick wall.. burned a whole in my poly pants and took my breath away... I was still shaking @ 1800hrs.... The next day I questioned Jesse ( other tech ) did you drain the flyback? He barely got YES out of his mouth before I punched him out cold.

Dude, I was in class working on a CRT TV and I used a flat head screw driver to pop off the wire going into the tube and that sucker zapped me something fierce. It caused me to snap my arm back and the screw driver went flying thru the air at a high rate of speed. Lucky no one was hurt. Never again. That's about 15k-17k volts if I remember correctly.

[Phil B.]

Re: IR3300 Laser Unit

Dude, I was in class working on a CRT TV and I used a flat head screw driver to pop off the wire going into the tube and that sucker zapped me something fierce. It caused me to snap my arm back and the screw driver went flying thru the air at a high rate of speed. Lucky no one was hurt. Never again. That's about 15k-17k volts if I remember correctly.

yeah my leg was grounded to the table tho! OUCH!

[Tricky]

Re: IR3300 Laser Unit

You can put the PC board in an oven for about 5 minutes and sometimes it will work if you have a cold solder joint and can't find it.

Anyone ever heard of this?

Not too sure about the oven but way back I managed to get the logic board in these working again just by resoldering the power socket.

[BillyCarpenter]

Re: IR3300 Laser Unit

Not too sure about the oven but way back I managed to get the logic board in these working again just by resoldering the power socket.

As a general rule of thumb, whatever component generates the most heat, that's where you look first. Anything that's attached to a heatsink is a good place to start.

Also, most components fail when the power is turned on because of power surging thru the circuit. That's why most light bulbs blow when you turn on the light switch.

[Tricky]

Re: IR3300 Laser Unit

Dude, I was in class working on a CRT TV and I used a flat head screw driver to pop off the wire going into the tube and that sucker zapped me something fierce.

Lol fuck that I once had to replace a tube in an imac computer and luckily for me the only one we had in stock was for the southern hemisphere, yes they were different part numbers due to some mistake in the stock department, so I got out of that job !