Ive had this monitor about 4 years and have always heard some kind of rattling inside of it whenever I moved apartments. Apparently a screw came loose from the video board and rattled its way around until it landed on the heat sink for that row of 3 transistors on the power supply and shorted it out. ( Spot welded itself to it when I plugged it in). There's a little bit of charring on the board nothing serious. I was wondering if anyone knew the type of transistors. Idk if theres any capacitor damage, there is one near it that has bubbled up tho (470uf 35V i think). Thanks
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Re: LP2407 power supply transitors
The part numbers for the transistors are usually stamped on the transistors themselves. If you're still not sure, then photos would be necessary to provide any further help. -
Re: LP2407 power supply transitors
Yeah I really didnt want to pull them off the board just yet because I haven't tested them out yet. Some of them are kind of hard to read. I have a toasted resistor (R870 i think its a 1watt) and a bubbled cap (C864 470uf 35V) I going to replace first before I start ordering those transistors. Oh just for knowledge the transistors are
-11N80C3 (MOSFET made by Infineon)
-R860PF2 (8A, 600V "Stealth" diode made by Fairchild)
-FQPF12N60C (N-Channel MOSFET made by Fairchild)
At least thats what I found, might not replace them but you never know.Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.
i know that in linear power supply the noise will be very low comparing to SMPS supply.... -
I have a power supply I'm trying to fix. I've narrowed it down to 2 bad transistors. They are marked ALG and BKD. They are smd sot23 package. Does anyone know what these are or how I can Identify them? Thank You!
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