Onkyo TX-SV525. "ERROR DSP" msg displayed only when choosing video src
This has several resistors and an area about the size of a quarter that is looking a burnt brown on the pcb near the front of the unit. There are about 5 or 6 ringed resistors total in this area. I need to know how to test them to see if bad or not. When using the tuner/radio portion all seems to be fine (uses the bypass mode for radio). When using the bypass feature (which only utilizes the 2 rear channels I believe) for the video/theater audio, this works too. The option to use anything that utilizes the DSP portion is a complete fail. Just a low hum or his is presenting thru speakers. Shame to toss this in the trash because this receiver is an oldy but goody. Seems like I could place a few resistors and all would be well? Hopefully the community here will be familiar with the issue. Thanks in advanced! I have located a service manual but lack the knowlege to read it. I also have pics of the overheated resistor location.
Pictures and service manual have been uploaded. Thanks!
6/9/2021 - still have this on my shelf in need of an answer. Please help…anyone?
Questa è una buona domanda?
Actual board part number (I think) is ncar-5121. These are numbers from the board anyway. I didn't find them on the schematic but that service manual is the same model as my receiver.
Resistors in the burnt area:
r923 (actually labeled r23 on pcb)
r925 (actually labeled r25 on pcb)
r926
r928
r929
r930
r935
da Edward Anderson
I've resoldered all of those resistor and transistor contact points plus re-soldered all the contacts on about 1/3 of this board.Improvement has been noticed as not all of the resistors listed below are as hot as they were with the exception of the 3 listed below.
https://www.dropbox.com/s/m66gysdhfqyojz...
The resistors and their tested values are:
r930 = 118.8 ohm HOT TO TOUCH!
r929 = 118.5 ohm HOT TO TOUCH!
r928 = 18.4 ohm HOT TO TOUCH!
r935 = 22.1 ohm
r923 = 1.5 ohm
r925 = 11.4 ohm
r926 = 11.5 ohm
These seem to be within range
Values for outputs tested by touching the negative to the G (?) Terminal and pos to the O terminal (is this the correct way to test?):
Q921 = + 11.7v
q922 = -11.6v
q923 = + 6.02v
q924 = - 5.8v then drops to 0 usually (this one drops voltage after heating up)
q925 = + 5.5v
Pls provide suggestions on comparable replacements if needed? Where to get?I've been studying on how to test these v regulators as well. Is it necessary to remove them first?
da Edward Anderson