In this amp there is power and all mosfet and channels are working but no sound and even no humming.
But there are two high wattage resistors or heavy Transistor and they are heating so much,
Please help to find which component is damage in this amp
But there are two high wattage resistors or heavy Transistor and they are heating so much,
Please help to find which component is damage in this amp
Are D510 and D511 shorted?
How do you define channels as working if they produce no audio?
If you desolder those 2 resistors, what resistance do they read? They may be the wrong value. Add to that, shunt regulator resistors often run hot from high power dissipation. That's why they use large resistors.
How do you define channels as working if they produce no audio?
If you desolder those 2 resistors, what resistance do they read? They may be the wrong value. Add to that, shunt regulator resistors often run hot from high power dissipation. That's why they use large resistors.
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if diode is short then it will explode and it will not give any reading in multimeter also.
Because when i use multimeter in continuity mode and touch the channels IC's legs then speakers humming.
150 ohm resistance. And i also check with color code and same outcome was coming
At the top of the thread, you stated no humming.
Diodes rarely explode.
150 ohms is low for that duty.
1. What's the resistance reading across each of those diodes? Measure one way then reverse the probes and measure again.
2. What are the part numbers on those diodes?
3. What's the DC voltage across the PS pins (4 and 11) of the op-amps?
4. What's the DC voltage on 3 legs of any of the output transistors?
5. Is there a preamp board missing?
6. What's the damage at the lower-right of the top image?
Please answer all questions.
Diodes rarely explode.
150 ohms is low for that duty.
1. What's the resistance reading across each of those diodes? Measure one way then reverse the probes and measure again.
2. What are the part numbers on those diodes?
3. What's the DC voltage across the PS pins (4 and 11) of the op-amps?
4. What's the DC voltage on 3 legs of any of the output transistors?
5. Is there a preamp board missing?
6. What's the damage at the lower-right of the top image?
Please answer all questions.
Yes, but humming is not coming through the preamp section. It only humm when i touch the multimeter terminals directly on channels ICs. May be it simply means that ICs working good there is problem in preamp or audio section.
620 Ohms in D510 and 586 Ohms in D511. And when i reverse the terminals then diodes values is 0.
P6KE 16A 929.
Attachments
if you are talking about those IC's. See in attach pics.
Then its DC voltage is 2.95 V in both of them.
Attachments
Please explain me which transistor are you talking about. If you are talking about Channels ICs legs then its DC voltage is 18 V.
The voltage can be from any of the large transistors with their 3rd leg connected to the large pink resistors.
There should be positive voltage on half of them and negative voltage on the other half.
There should be positive voltage on half of them and negative voltage on the other half.
while measuring the voltage on 1st & 3rd leg of big transistor connected to the large pin resistors there is no any voltage but when i touch the 2nd leg with pink resistor there is 18V postive in half and negative in half.
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there was a volume switch but its damage so i made the jumper and then it was worked great.
The first thing I'd do is replace the two TVS diodes with 15v Zener diodes. 1W preferred. Then check the voltage across pins 4 and 11 again.