onkyo tx-sr706 hdmi board
ok I have some bad chokes next to the power supply input but I cant find the part does anyone know there I can get these chokes?
rcp1317np470m fixed ind. 47uh 3.3a 69 Mohm ferrite core
rcp1317np470m fixed ind. 47uh 3.3a 69 Mohm ferrite core
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Re: onkyo tx-sr706 hdmi board
pics of the ind.Attached Files -
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Re: onkyo tx-sr706 hdmi board
Try digi-key, search for 47uH, then filter down to 69 mOhm.
There is no thru hole part though, only surface mount.Last edited by ngvuanh; 03-29-2016, 09:04 PM.Comment
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Re: onkyo tx-sr706 hdmi board
cant use surface mount, I have already went through all the normal channels to find the choke. digikey will order some but 100 pieces min, and 6 months order.Last edited by harleyman58; 03-30-2016, 06:44 AM.Comment
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Re: onkyo tx-sr706 hdmi board
Are you sure that this is the problem.
Long time ago i have service one of them and the problem whas if i remember right the 1.2 volt to the HDMI procesor switch.I change 2 parallel caps . Also another one unit have a dsp chip problem.Comment
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Re: onkyo tx-sr706 hdmi board
Can we see the location where this inductor is used on the board?
Does it show open circuit? Shows wrong inductance? It will show very low DCR.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: onkyo tx-sr706 hdmi board
Can you tell the problem you are having with this unit?
There are 3 power supplies for this board, 1.8V_CORE, 2.4VDSP and 4VHD.
Each section has this coin for filter L8952, L8953 and L8954, so you can jump for testing purpose.Last edited by ngvuanh; 03-30-2016, 11:46 AM.Comment
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Re: onkyo tx-sr706 hdmi board
ONKYO TX-SA706 SR706 SM 1 service manual.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809Comment
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Re: onkyo tx-sr706 hdmi board
the number is l8953. it was broken off the board??????Attached FilesLast edited by harleyman58; 03-30-2016, 05:47 PM.Comment
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Re: onkyo tx-sr706 hdmi board
I have receiver in dvd mode saying no signal, the speakers fl and fr showing output but no sound, or video. also no sound with radio,but no output on speakers lighting up.Comment
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Re: onkyo tx-sr706 hdmi board
I have 3.9 on the 4.0 rail , 1.8 on the 1.8 rail , 0 on the 2.4 rail with jumper. no soundLast edited by harleyman58; 03-30-2016, 07:59 PM.Comment
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Re: onkyo tx-sr706 hdmi board
Are you the first person who is be on this machine?
If not contact the previous service man because the problem seems to be very suspicious.
Now check all voltages with oscilloscope to see if you have ripple on them.
The sympoms are on start that the unit make a digital sound noise because a bad electronic cap on the dsp section.Sometimes you need to add an extra cap below the pcb.If the unit keep playing then the problem goes to hdmi and you get no sound unit goes death.
So know that most of the times the problem is the dsp and the data pins who feeds the rest start probe there.Last edited by charis; 03-31-2016, 04:46 AM.Comment
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Re: onkyo tx-sr706 hdmi board
I don't have an oscilloscope, I would like to have one but I don't know what to get. I bought the receiver on ebay for 9.99. something cheap to work on.i have several that I bought cheap. I worked on industrial machine electronics, but not audio equipment.all I have is a good meter,fluke that will check diodes and caps.,along with the normal voltages and millivolts. what test equipment do I need besides an oscilloscope? I do need a desoldering station.Comment
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Re: onkyo tx-sr706 hdmi board
will this work for the choke? digikey #2000-470-v-rc-ndComment
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Re: onkyo tx-sr706 hdmi board
You said that you have reflow the chip.
May i ask how?
If you dont have proper equipment is better to use an halogen 100w lamp for an hour above the chip not a hot air. And for reference put some solder above the chip to see when he melt.Comment
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Re: onkyo tx-sr706 hdmi board
I used a lamp but it did not work on the reflow.Comment
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Re: onkyo tx-sr706 hdmi board
Do not work on DSP chip until you have +2.4V unless it shorted to ground.Comment
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