La6508 tests

[mikearama]

I noticed someone asked about this a month ago, but received no replies.

Has anyone determined the test by which to determine if the LA is indeed toast or not?

[Rotosound_rb666]

not sure about LA6508, but I'd bet that they're the same as (just a cheaper substitute) BA5815FM, in which case pin #8 is the power supply, and when the 5815 fries, pin 8 will show continuity out to ground (direct short..owch) and that'll take out the PS11 fuze without fail (check that, too)

15 16 17 18 19 20 21 xxxx 22 23 24 25 26 27 28

BA5815FM

1 2 3 4 5 6 7 xxxx 8 9 10 11 12 13 14
**

[mikearama]

If someone could compare these results...

The LA in front of me shows shorts on pins 3, 4, and 21. It's a v9 (gh-023). Thanks.

[Rotosound_rb666]

if it blew out the PS11, then I'd say that there's more than just a reasonable chance that since that's the fuse for the power to the lazer ic chip (your LA) that what blew it was the la melting. I've seen 2 BA's now, that before taking down that fuse completely, managed to melt-short internally in such a way that although the fuse held, and the focus and diodes worked, the sled tracked from the inside out, slamming to the back, past the end of thd disc, where lacking that stop switch the spindle end has, it would just grind outwards as hard as it could.....somethings gotta short pretty bad to fun the sled in reverse..... otherwise they just went pin 8 to gnd.......
sorry that I've avoided 50k's (partially because that la is even crappier than the old ba...) till now,and I dont have any referance for them, I dont work on them.... I restore old models that were build better to begin with, when they were first $300, then even down to $200, the reason that the 50k's are down to $150 is simply that you get what you pay for, and Sony finds cheaper parts, and chaper manufacturing, wherever they can save a buck by sacrificing quality, they happily do, since as long as it lasts a month longer than the service contracts they sucker poeple to buy (more profit there, too) then the owner's had enough time to have more money invested in games than the thing initially cost, which are then worthless, without a console, so the crappier they make them, the more they sell.........
my advice is use that 50k as a fishing weight, or something...toss it, and invest in a nice used 30k, and if you have to, a new lazer for it, so it'll be fresh like new, it'll be cheaper, more dependable, and last longer, with a lot fewer "software security" issues built in to begin with ... wanna nice version 1? I can part with one all freshly rebuilt for $100, I have 3 of those, a couple of fours and sevens, too.... anything but a 50k!

[NEWCASTLEmodchi]

So in a working V9 console, what points of the LA *SHOULD* be grounded?