#1
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Sony KP-46WT520 CRT Projection TV - Standby Blinking 5 times
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? |
#2
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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.
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#3
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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 |
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