Jeweler's screwdriver or similar. Heat the terminal and lift it by working against an adjacent terminal.
If you took it out, bend the leg up slightly and don't solder it back down when you solder the rest of the terminals.
If you took it out, bend the leg up slightly and don't solder it back down when you solder the rest of the terminals.
now when its out measure between pad 4 to gnd and push board around if theres something?
could be any pad?
could be any pad?
pad 4 to r24 and pushing board around looks ok, no hiccups. if it leak to ground it would actually turn on?
maybe just slap new lm339 and godspeed.
how do i get mehsa board cleaned from old solder? takes so much heat
maybe just slap new lm339 and godspeed.
how do i get mehsa board cleaned from old solder? takes so much heat
Pin 4 has to be below the voltage on pin 5. I was asking you to do things to determine where the 9v was coming from.
I don't know what tools you have for heating. There are many ways to do it. I've used something as simple as an 1157 lamp. I typically use a butane (not propane) torch (culinary torch). Some people use a heatgun but that typically requires heat shielding (a couple of layers of foil will work).
If you have sufficient heat to work the MEHSA strips, you shouldn't need to remove solder unless you added a lot of solder when you soldered them down previously.
When you replaced the FETs the first time, what did you use to heat the strips?
I don't know what tools you have for heating. There are many ways to do it. I've used something as simple as an 1157 lamp. I typically use a butane (not propane) torch (culinary torch). Some people use a heatgun but that typically requires heat shielding (a couple of layers of foil will work).
If you have sufficient heat to work the MEHSA strips, you shouldn't need to remove solder unless you added a lot of solder when you soldered them down previously.
When you replaced the FETs the first time, what did you use to heat the strips?
i have hot air and solder pump.
i tried with hot air+ iron and wicks, felt like theres not enough heat. not enough hands for sure
now its hot air +solder pump got some out but it needs to be cleared better
i tried with hot air+ iron and wicks, felt like theres not enough heat. not enough hands for sure
now its hot air +solder pump got some out but it needs to be cleared better
If you don't have enough heat to remove the solder, you don't have enough heat to solder the replacement FETs to the MEHSA insulators. You will have to find/use a better heat option.
i might be too careful with that air. got that lm out pretty fast with air.
so put lm back in with lifted 4, measure pad and leg when amp is powered?
so put lm back in with lifted 4, measure pad and leg when amp is powered?
i saw 1.1volts on leg4 new 339 on board, amp wasnt turning on and i somehow popped other irf3205.
im good at this
im good at this
i have only battery voltage with current draw meter.
but amp wasnt turning on with new 339. looked fine before my probe accident
but amp wasnt turning on with new 339. looked fine before my probe accident
Do you have new IRF3205s?
I'll need the voltages again.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
I'll need the voltages again.
Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
Pin 9:
Pin 10:
Pin 11:
Pin 12:
Pin 13:
Pin 14:
Pin 1: 0.5
Pin 2: 4
Pin 3: 13
Pin 4: 2-10v
Pin 5: 1.4
Pin 6: 2.3
Pin 7: 2.3
Pin 8: 4.9
Pin 9: 1.5
Pin 10: 2.2
Pin 11: 3.4
Pin 12: 1mv
Pin 13: 4.3
Pin 14: 8mv
so board is leaking cause that 4 is all over place
Pin 2: 4
Pin 3: 13
Pin 4: 2-10v
Pin 5: 1.4
Pin 6: 2.3
Pin 7: 2.3
Pin 8: 4.9
Pin 9: 1.5
Pin 10: 2.2
Pin 11: 3.4
Pin 12: 1mv
Pin 13: 4.3
Pin 14: 8mv
so board is leaking cause that 4 is all over place
Are you saying that you can touch your meter to the circuit board (on on any trace or pad) and the meter will read voltage?
i really thought it was faulty 339, it reacted so little touch first time. amp havent work after i re soldered original 339.
i kinda understand that lifted 4 leg try to hunt where that voltage could come
i kinda understand that lifted 4 leg try to hunt where that voltage could come