Sony KP-46WT520 CRT Projection TV - Standby Blinking 5 times

[CoogarXR]

I have a friend who has a Sony KP-46WT520 CRT Projection TV, made about 2005. He says the other day it would turn on and the standby was flashing 5 times, and that he'd have sound but no picture.

I have done plenty of DLPs and flat-panel TVs, but I have only worked on a handful of CRT projection TVs. Any of you guys ever worked on this model? If so, any tips?

I normally wouldn't consider a CRT projector repair job, but it's for a good friend of mine. This will be a house-call repair too, heh.

I saw a generic Sony blink-code list online, I don't know if it pertains to this model. Here's what it says for 5 blinks:

"FIVE Blinks---AKB circuit (AKB), the timer/standby indicator blinks for about
30 seconds then goes to the self-diagnosis function. Something is wrong with
the video. Check video out, Q705, 732, 761 and other components on the C
board, also check Q218, 219, 220 on the A board. Also unit be in IK blanking,
try turning up screen slightly."

So, any of you ol' pros have any tips?

[rcaman]

could be weak crt's sonys were never that good and seem to go bad quicker than any other brand. it the crt's are weak you will get the 5 blink. leave it on for a good while and see if the picture does appear and look at the quality of the picture that will tell you if the crt's are tired.

[zeno]

From a direct view standpoint but most will aply to projos.
Be sure the HV is coming up.
If so be sure the 200V is coming up, its off FBT & feeds
3 video outs.
Check for cold joints around the vert IC. Most Sonys use
+15 & -15 to run the vert. If one is missing the sweep gets
pulled off the screen then shut down. Both also come from
the FBT.
You can also keep starting the set & see if you see a symptom
but be sure the HOT isnt getting to hot.

73 Zeno