good deal, is Q217 bypassing r247 causing the amp to come on? I'll go ahead and cut it out till i can get another ordered then. Thanks for all the great help folks! 🙂 i assume i should resolder r247 back?
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Hi,
Congratulations!!!! Good news. Now you can listen to music. Thank you to overall feedback to jump in.
Congratulations!!!! Good news. Now you can listen to music. Thank you to overall feedback to jump in.
it's been removed and the amp still, comes on so it might of been a good part? 😕
Well, my amp still works and sounds great! I think if I order a new transistor I'll just order every one that is on that board and replace them all. Might as well replace as much as I can while the board is out. Another thing I wondered was maybe the original 4013 chip was bad and, when I replaced it whatever ruined the original, may have instantly ruined the new one as soon as I plugged it in sound possible? Thanks! 🙂
Hi,
Does the standby LED light up when you toggle the switch? Normally when a chip it is solder to the board I do not worry damage it. What I do it is cut the pins flush to chip and then pull each one while heating it with the soldering iron. It is easy and the most important is that you do not damage the board trying to unsolder the old one.
Does the standby LED light up when you toggle the switch? Normally when a chip it is solder to the board I do not worry damage it. What I do it is cut the pins flush to chip and then pull each one while heating it with the soldering iron. It is easy and the most important is that you do not damage the board trying to unsolder the old one.
I've not seen the standby LED light up since my on and off switch problem. When I removed the original 4013 chip, I cut it out as you mentioned and I have a desoldering iron with built in suction bulb that I used carefully on the soldered pins on bottom of board and pulled each cut pin from the board. When they are soldered on the bottom only, I just use my desoldering iron/suction bulb and works great but do cut them out when soldered on both sides of board. Thanks. 🙂 I've tested standby LED with diode check mode with it still in place.
I have the amp hooked up right now but, will unhook it after while and check that. here is what I have been using for reference testing points on all transistors is this the correct pinouts?
I was looking at that diode on the schematic a while ago I think when I unhook the amp again I'll remove that board and test every component I can for opens or shorts by lifting legs. I know when I order the Q217 I cut out I might as well order all new transistors since they are cheap anyway to help make up for shipping costs. Thanks again! 🙂
Hi,
The LED's it is turn ON/OFF by Q217 thru diode D224. Check the resistor R250 that it is in series with the LED's.
The LED's it is turn ON/OFF by Q217 thru diode D224. Check the resistor R250 that it is in series with the LED's.
Check by diode tester and ohmmeter Q217 collector to ground, what you get? When you unhook it of course.
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Some posts mentioned to GND pin 1 of CD4013B.
NEVER ever ground output of any IC.
By mentioning voltages on text, many won't diagnose your problem as is too much time consuming.
Read my that post, and then post two diagrams with voltages written on it. This makes it easy for the helper to help you.
Gajanan Phadte
NEVER ever ground output of any IC.
By mentioning voltages on text, many won't diagnose your problem as is too much time consuming.
Read my that post, and then post two diagrams with voltages written on it. This makes it easy for the helper to help you.
Gajanan Phadte
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I didn't miss your request for those I just didn't want to tell you I didn't know how to do that on a computer. 😱 I'll see if I can learn how though as it would be much easier for those of you who have been helping me. Thanks very much! 🙂
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