Add update to solution

content/posts/2017-09-11-denon-avr-4520-repair.md

@@ -147,18 +147,26 @@ With that, I've narrowed the problem down to `Q808`, a `DHCT-C3` darlington tran
 
 ## Repair
 
-As with almost every project, diagnosign the issue is much harder and time consuming than the
-actual repair. The process is quite simple:
+As with almost every project, diagnosing the issue is much more time consuming than the
+actual repair. I ordered a _new old stock_ pair of transistors, this is a set of complimentary
+`-A3` and `-C3` transitors including two insulating washers.
 
- 1. Order a new pair DHCT-A3/C3 (they are sold in pairs)
- 2. Replace both `Q808` and `Q809` with the new pair
+![](/img/denon-avr2520-new-transistors.jpg)
 
-Done. 
+Next it's a simple job to remove the old darlington transistors...
 
-While I wait for the replacement parts to arrive, I figured I'd start using the amp already. 
-I have a 2.1 setup, bi-amping the front speakers. Luckily, the AVR allows me to select which
-channel (Surround Back or Front Height) to use for this. I disconnected the `SBR` and `SBL`
-amp board as I won't be using them and circumventing the DC power protection problem. 
+![](/img/denon-avr4520-new-and-old.jpg)
+
+and place the new ones.
+
+![](/img/denon-avr4520-new-transistors-soldered.jpg)
+
+Finally re-insert the amp board into the amp with some fresh heatsink compound. 
+
+**Do not
+forget to add the insulating washers to prevent them from shorting out via the heatsink!**
+
+![](/img/denon-avr4520-final-solution.jpg)
 
 ## Conclusion
 
@@ -166,7 +174,11 @@ Replacing the DHCT-A3/C3 darlington transistor pair has resolved the power prote
 issues. I've been running the amp in my living room for a few days now and not seen any 
 issue at all.
 
-So, for the cost of a used entry-level AV receiver and € 20 in parts I've got 
+![](/img/denon-avr4520-final-setup.jpg)
+
+So, for the cost of a used entry-level AV receiver and about €15 in parts I've got 
 an almost brand new Denon AVR-4520 top-of-the-line AV Receiver. :-)
 
+_For those interested, I'm  using the `SBR/SBL` channels to bi-amp my speakers._
+
 [hifiengine]: https://www.hifiengine.com/manual_library/denon/avr-4520.shtml