Re: Denon avr 2802 with no sound on speaker
Update: i cleaned all connectors and resoldered all chips but
Unfortunately this didn't help i tried that and same problem exist. Very low sound on max volume only in direct mode and as soon you change mode or input source sound stops and is no longer present ,when you switch it back to direct no sound until, switch of and switch back on. Any more ideas ? I will check tonight with oscilloscope for clock on all chips.
tufi979
Member
Last Activity: 08-23-2020, 02:38 PM
Joined: 03-03-2012
Location: Belgrade
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Re: Denon avr 2802 with no sound on speaker
My friend will bring me his oscilloscope tomoro evening tell me what to check , where, and what readings to expect ?Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
You think that this is the best part to change and to see what will happen? or maybe will be better idea to find some oscilloscope to verify signals. What do you think it is the enough range for oscilloscope 20Mhz for audio service ? I will not use it to much for servicing that i do i rarely need oscilloscope i dont want to throw money away
So you think that i should check if clock is change on input pin of IC 805 when volume is going up or down and if there is change IC 805 is bad , and if it is not changeling then something...Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
i tried this signal to trace on IC809 but no output signal
and as i can see STB4 is from function selector ? right ? I think this is volum control flow:, from knob to IC303 then to ic 809. I would check for shorts tomorow
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Re: Denon avr 2802 with no sound on speaker
I get this signal trace only in direct and stereo mode , in every other mode there is no signal on those pins, could it be DA converter IC 602 also ? because there is no signal output on pins 23 till 28 this is signal for rest of the channels except front ones.Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
I aplied sine wave 500hz to dvd input and folowed signal to pin 24 and 5 (left and right ch ) and that is where signal stops. When i baypass signal from pin 24 to 26 i get sound on speaker left or right depends which one i baypass 24 for left an 5 for right. In this case i dont have volume control i cant turn volume up or down i mean there is no diference in output sound no matter if volume gors up or down. I guess in this way i baypas volume control . So it must be master ucom or something else that is between those two...Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
Did you manage to download service manual that i uploaded ? is it ok ?...Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
i dont have osciloscope
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Re: Denon avr 2802 with no sound on speaker
Ha ha , did you had some "good " experience too...
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Re: Denon avr 2802 with no sound on speaker
No
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Re: Denon avr 2802 with no sound on speaker
here is short version of service manual....Leave a comment:
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Re: Denon avr 2802 with no sound on speaker
ok one sec
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Re: Denon avr 2802 with no sound on speaker
try google search denon avr 2802 service manual and scroll down to find this electrotanya siteLeave a comment:
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Re: Denon avr 2802 with no sound on speaker
can you send me your email here or private message to send you via drop send , service manual iz 38 Mb that is why i cant upload it
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Re: Denon avr 2802 with no sound on speaker
Well im sure it is broken it cant be that simple not with me well i tried every button every mode etc. i reset it couple of times but no luck.
i checked pin 14 on IC 108 and on IC 805 there is same buzz or hum i guess the clock that drives this is ok . BUT when i bypass signal from input pin 24 to output pin 26 ( same as from pin 5 to pin 3 ) on IC805 i get input sound on speakers but without volume control ( i cant turn it up or down ) just constant tone as i can guess same level as input sound on pin 24. So do you have...Leave a comment:
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Denon avr 2802 with no sound on speaker
Hello to you all. I have been browsing for a couple of days now about my problem but i was unable to find solution so i will try here
I bought used Denon avr 2802 faulty. Receiver turns on like it should relay cliks it responds on all commands ( volume change on lcd, switching between sources , mode selector... ) but there is no sound , i downloaded service manual , i checked all voltages on supply rails and everything looks normal and as it should. I traced input signal from dvd input and signal is lost on TC9459N , there is input signal present on pin 5 and 24 , but no signal is getting... -
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Hi i have problem with exactly the same Power board , only i don't have any output voltage nether 5 nor 12v. But R108 after plugging in keeps burning out slowly. I'm running out of 47k om resistors. What could be the problem , im guessing some short circuit but i cant find it. Supply voltage correct 240v. big cap ok. No power on secondary circuit.
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Re: Acer 19" problem with screen
so no one has any idea what is wrong ?Leave a comment:
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Re: Acer 19" problem with screen
I303 is 24c16wp i re-soldered pins. just to be sure.Leave a comment:
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Re: Acer 19" problem with screen
i just checked voltages on flat cable going to display. on first picture on flat connector first 5 from bottom voltage 5.18 without display connected. and fluctuation of voltage from 5.0 4.88v this corresponds to picture loss. I guess that problem is on the lcd panel board? but what?Leave a comment:
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