Onkyo ht r997 ошибка ng lcr

Hello,

I purchased two store returns for next to nothing and have taken them home and began looking into them. Both have the same error message and here are the details on each. I also have pictures. I’m just not sure where to go from here. I have the service manual but this is my first time working on AVRs (I build computers). I tried clearing the codes but they come right back up, so there is definitely an issue somewhere.

The same code shows on both of the units NG: LCRSLSRBLBR

TX-NR646
I have it all apart. I cannot see anything physically wrong with it. All the fuses check out, connectors are good. I took out most of the boards and looked at all the circuits. The caps look great, I don’t see any issues. I checked all the transistors and they seem fine to me. 

TX-NR545
This unit has been dropped. The case has a bend on the top and it had a rattle. I opened it up and found a small black piece of plastic from the chasis inside that was rattling around. Checked all the fuses on this unit but have not dug terribly deep in it. The bend in the chasis is on the top but I cannot see where the plastic piece came from. Must be somewhere behind the front panel perhaps.

I hear relay clicks and the code shows. If I reset the code it shows the volume level for a second or two then shows the code. It doesn’t power down till I power it down.

I am holding Standby and Enter to clear the codes as it suggests in the service manual.

Just double checked, those are good.

for the record the 646 is my main goal here. I want to use it!

Well you are going to have to start checking voltages. You will probably have to solder a jumper wire across the power relay so the main transformer is powered all the time. Otherwise you may not get accurate reading. If you do not know how to do this, ask.

Then I would start testing with you DMM on DC voltage and first check the + and — 15v regulators, Q4170 and Q4171 on the ASP board (BAAF-1720). Test for correct voltage on the outputs of each. Post your findings.

Master,

I do not know how to keep this main power transformer on all the time, can you elaborate? Thank you so much for all your help so far. I greatly appreciate it.

On the power supply board, locate relay RL9001(see green circle in pic) and solder a jumper wire across the 2 legs with the red line going to them.
Just remember that as soon as you plug it in now the whole unit is powered. So watch where you put your fingers and test probes.

Master,

Apparently I was doing the reset code sequence incorrect. I thought you had to hit enter and standby/on at same time or even hit ON first, apparently you have to hit enter THEN standby/on. Now, both units are going through AMP testing after reset.

I tested both areas you suggested on the NR646 and did not have to wire the power supply to stay on. One of the spots showed 25.1 and the other spot showed -25.8 on my multimeter and were very stable, changing dramatically with power off (of course). I assume this points to a resistor or something not working as it is printed on the board right there 15v. Note: This was a bit of a bear to test. I had to take it apart, and run some lead wires to both of those areas then reassemble with the leads attached to my multimeter.

TX-NR646
Amazingly, it WORKS sometimes!? After a clear it won’t work, but if I unplug it after a clear and plug it back in it seems to work until I power it off and power it back on. I can’t get it to consistently do it and I have NO IDEA why its working. I made it work twice, but I couldn’t replicate it I’m not sure how I was getting it to work exactly.. But it is working for a few mins at least. I didn’t have speakers hooked up either time I got it to work but I was able to change inputs and adjust volume and everything seemed to be working fine. The code on the display is now: NG C SLSRBLBR . When I hit enter it says: DET. PROTECT I

TX-NR545
Multiple resets and it still will not come to life for me. However, the code has changed as well with my resets. After amp diagnostic runs, it shows: NG L R. When I hit enter it says: DET. PROTECT I