I just followed this guide for my very nearly 6-year old 62HM196. I bought a "Toshiba 62HM116 DLP 62HM196 62MX196 Sub Power Supply PE0032 C 2 V28A000007B2 0092" board from Ebay for about $50 and replaced it myself using your guide. While my TV was not identical, there were few differences in the layout and so this guide worked very well for finding the parts and layout of the interior, and knowing where the screws were (mostly). This repair has fixed my TV.
I have not repaired a TV before, but I have a moderate understanding of electronics - I build my own computers, so replacing a PCB that did not require soldering seemed simple enough. It took me about an hour and a half because I was going slow and careful, and inspecting parts as I encountered them, since I did not know what was wrong with my TV. I was looking for bulging caps, shorts or burned fuses. I did not find any, but went ahead with the part swap anyway since I had gone to the trouble to order it, and if I needed to go do the entire ballast, at least I could rule out this part.
Along the way, I found significant dust all over, but heavily concentrated on all the fans. I used a vacuum to clean it, and was careful around the color wheel assembly area to not "blow" or kick up dust into that opening. The lens that projects up to the mirror was slightly dusty, with a very light but noticeable film on it (I could not see the mirror itself to check). I popped the plastic protector off of that piece and cleaned it with a micro-fiber cloth. It snapped back into place very easily. I also sucked dust out of most of the fans, and notably, off of the copper coils on the ballast board (which I did not replace). There is a small fan that blows on them (nearly identical to your pictures), but my coil in front of the fan was nearly entirely piled with dust - much more than in your picture.
After putting everything back together, the TV started up fine.
My symptoms were: lamp light flashing - any time power was applied to the TV, it would simply continue to flash the yellow light in 3-second cycles indefinitely. The TV acted up over a period of about 3 months, at first turning itself off while I was watching it (no pop for the lamp - and I verified by inspecting the lamp which was new last summer), and then not wanting to turn back on. This only happened a handful of times, and I thought it might be heat because 5-10 minutes of rest would allow it to turn back on - but then it would continue to run for a very long time - making me suspect heat may not be the whole issue. After the final failure (I had been watching it), it turned off and never came back.
Thanks so much for this guide. It will save me a ton of cash.