Originally Posted by superguppy
Hi, I'm new to this forum. I just picked up a supposedly working KV-34HS510 today only to find out that there's no video and I get the 6 blink problem. I've read some of this thread and know that replacing the two MCZ3001D ICs (IC8002 or IC6501) on the D board has worked for a lot of people. However, I just found the service manual for my model and it says that 6 blinks refers to:
LOW +B OCP/OVP (overcurrent/overvoltage)
and the probable causes are:
+5 line overloaded (A, B, M boards)
+5 line is shorted (A, B, M boards)
IC504 is faulty (A board)
Given that there's no mention of the D board, can someone please explain the discrepancy between what the service manual says and the solution that has worked for many on this forum? Also, does someone familiar with the service manual know if there are more explicit instructions in it regarding how to fix this issue?
Thanks in advance.
To give it in say "laymen" terms.
Basically what RobertF and blue_z are saying is that....
If the MCZ3001D chips were working to their specs then the problem would be what the manual says. BUT, since these chips have a high failure rate (Sony nor any manufacture of electronics would have that in their manual, unless it is an updated version where they may mention it and suggest another solution. but being that it is electronics and is out of date within a year they more then likely won't update them that way
). Now I am sure when Sony was making the TV and the manual for, they were sitting there thinking....well what if this chip bad? should it give a separate code?....NO! they will assume that what they use will always work the way it was intended to. OK, with that said. These chips are like middle men in the chain of events to come up with the troubleshooting circuitry's displayed problem to why the TV will not come on for you. In other words, if the chips fail (burn up, short, whatever will cause them not to be working properly) they will give a false reading to the monitoring circuit and in turn the monitoring circuit will think it is the problem of what that input is telling it. And to the monitoring circuit it is a LOW +B OCP/OVP (overcurrent/overvoltage) problem.
Those (MCZ3001D) chips are the link between the LOW +B OCP/OVP and the monitoring circuit that gives the codes to let a repairman locate where to look for a solution. Any repairman will tell you that is just a starting point to troubleshoot and is not the actual problem. Sometimes it is just the fault of the monitoring "chip" (yes it is most likely another chip that looks at all these different inputs and says "check here for solution").
It took me a lot of searching to find someone with some knowledge of (and experience with) these MCZ chips going bad. I was much like you when first searching, got the manual and it said this or that was problem. But after reading and getting guys like RobertF and JDRE with background on this issue. I just went and replaced and to my surprise "wala" WORKS!
Now! true! yours could be the LOW+B problem? We can't say for 100% fact it is the MCZ chips. But, with most it is the chips and not to many around said the power circuitry failed like the manual says it should be the fault. Which would you believe it to be?? That's the question you have to ask?
Sorry for the long post..Hope it helps though?
Thanks for everyone's support and input here.