onkyo tx-sr706 hdmi board

[harleyman58]

Re: onkyo tx-sr706 hdmi board

the dsp chip I reflowed was not on this unit. ok I have 2.4 volts now and the radio works but the sound is very distorted. I have no sound and no video on the hdmi output.

[mmartell]

Re: onkyo tx-sr706 hdmi board

Hdmi problems could be related to known problems with drying electrolytics in the x06 series of Onkyo receivers. I'd doubt it has anything to do with distorted sound though.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

Okay changed all the caps on the board. I got radio back with no distortion But the video and the sound for the HDMI is rough the video is all green with streaky lines through it and the sound is crackly any thoughts on this problem

[ngvuanh]

Re: onkyo tx-sr706 hdmi board

This one is really tough for you. You might think about getting a portable oscilloscope.
I got one from amazon about $110. It is only 2 MHz but helped me to fix audio issue (only pure direct working) on one of my receivers.
Just search for sainsmart.

How about sound from analog inputs like CD or tuner?
Do you get on screen menu?

[tibimakai]

Re: onkyo tx-sr706 hdmi board

There is no corrosion on the board?

[harleyman58]

Re: onkyo tx-sr706 hdmi board

no its a clean board, I want to get a oscilloscope but I don't know what to buy? tell me what I need.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

no I do not get the on screen menu.?????

[harleyman58]

Re: onkyo tx-sr706 hdmi board

ok I have good sound on the radio, and I have sound on the hdmi outputs. but I don't have video, if I press on the board a little video comes through but it is streaky, various colors, or if I tap on the back metal plate,aka ground it does the same thing. I cleaned the metal where the hdmi plugs contact the back plane. no difference. broken copper trace.?????? I really looked the board over to make sure I didn't overlap some solder somewhere.the sound doesn't change when I press on the board or tap the ground plane. any thoughs on what to look for ? I assume the problem is in the hdmi output to the tv.

[charis]

Re: onkyo tx-sr706 hdmi board

Do you have the 5v on pin 18 on all hdmi chips?
Also you can check with with oscilloscope DCC data and clock.
Dont forget to check the 4 resistor in all the hdmi chips.
The have test points on pcb.
All the outputs share the same ground so look also for that.
Most like it is that the switch dont feed them right.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

im new to this so you will have to tell me the chip number and where I can find the ground. don't have a scope

[harleyman58]

Re: onkyo tx-sr706 hdmi board

pic of board

[ngvuanh]

Re: onkyo tx-sr706 hdmi board

Try HDMI pass thru option to see if you have video and we will go from there.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

no video on pass through option

[ngvuanh]

Re: onkyo tx-sr706 hdmi board

If you have no video on pass thru, you need to check Q8162, Q8501 and Q8401.
Q8162 and Q8501 are multiplexer (input selector switch) and Q8401 is output for HDMI ports.
Since you don't have scope, let check power supply for each chip first, then clock and data.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

ok I have 1.8 and 3.3 volts on each chip. ok if I put the receiver in setup mode and if I press down on the genesis chip which I guess is the video chip, the setup mode comes on, I can read it, but it has streaks through it. I think the problem is the video out, not the input.

[mmartell]

Re: onkyo tx-sr706 hdmi board

The caps you need to replace are the 100uf surface mount ones, especially the ones across the voltage regulators. Others can also be bad as well like the 22uf's. The eeprom chip has a bad habit of wiping itself when the caps dry up causing no OSD but seems you still have.

Double check your work on the caps you already replaced.

[mmartell]

Re: onkyo tx-sr706 hdmi board

Your dc supplies may look good because your dmm won't capture the ripple. Make sure to focus on the bottom of the board as well.

There is lots of info out there on this if you google "onkyo hdmi switching headaches" for instance. Main thread will come up regarding the 606 and others but applies here.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

All the caps were changed but the very small ones. I have checked my work three times for correct placement of caps.

[harleyman58]

Re: onkyo tx-sr706 hdmi board

going to put caps on the output side of the regulators. will that help????????????????

[harleyman58]

Re: onkyo tx-sr706 hdmi board

ok I bought another hdmi board. when I hooked it up I had video and very faint audio. I replaced all the 100x4v caps and the 220x4v caps, but I still don't have any audio. hdmi or radio. the first board had good audio but no video . this one is just the opposite. is there anything else I can change to maybe get audio?

thank you kenny