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D1911 always damage

The power transistor on board D1911 everytime I Change the transistor is always damage in a second and very hot.

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Check the component around it , check diodes, transistors, resistors, and capacitors. check also the power supply voltage.May its too high.

Posted on Jun 04, 2009

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Posted on Jan 02, 2017

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Installed a complete TV repair kit and now new problem, it just blows the power board fuse


you still have a short to ground on your power board
replace the fuse with a resettable circuit breaker and start looking with your oscilloscope or, multimeter for a high amp drain that was blowing your fuses

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If warrantee still good get new one if not check for broken solder joint on transistor works until it gets hot may need new transistor should have numbers on it., If to hot will need schematic. first get sodering iron and soder 60/40 remove all covers, get(freeze it) a can of cold spray and keep hands away from power supply board the board with the wall plug coming out of it and the thick wires connected to it. do not touch, Plug it in the wall and wait until it turns off, spray the componets that you think are the problem the cold will allow it to turn on for a while check the transistors first (little black box with three leggs) then the capacitors (the little blue barrels with the black lines on them) when you find the componet call the company for the replacement part find the manufacturing company on the internet they will have it.simply make a drawing of the way the componet was in the curcuit and put the new one in,tip on how to soder pull the soder off the roll about five inches, Place the hot tip on the leg and the board wait a second and drop the soder on the hot tip for just one more second, letting a small amount melt off.do this on each leg remember that a transistor has a ground,a hot, and a base,The cap has only a positive and a negative.Good luck

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I received a PV1500 amp that had only one channel working. i decided to open the amps to check the other channel being that i usually repairs amps. up on analyzing the damage circuit board of that channel,...


It seems there's another component (a capacitor, a diode, etc) causing a short circuit to triac and transistor, or there's an over voltage on this stage, please check if the voltage is according to the one feeding the good channel.

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It's likely that you have shorted some speaker outputs, I had that problem and sorted it. Unfortunately it does mean replacing some output transistors..the devices are dificult to get to just to add insult to injury. They are the devices that are mounted directly onto the large heatsink and solder connected to the bottom circuit board. You only have to change the matched pair that you have blown....tricky to identify which ones without some electronics knowledge. The power output section does have some fuses to protect it but sadly these do not appear to be fast enough to stop "one" from damaging the power output stage if you unfortunately short outputs. The transistors are available from Farnell, use pin compatible replacements SAP15N and SAP15P.....all the best. Doctor Bill

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this trans sister and cap is going to be close to the hot which is high voltage be careful !!!!! the hot is a big red some times black with red thick wires, the transistor will have a silver(or black) heat sink with this larger transistor attached to it. the cap is going to be right by it

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