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Akai PT4298 Samsung HCM4216 P55A shut down    
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_Smithy
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PostPosted: Tue Sep 22, 2009 10:51 am    Post subject: Akai PT4298 Samsung HCM4216 P55A shut down Reply with quote

Akai PT4298 aka Samsung HCM4216 ch. P55A HV comes up momentarily

We unplugged convergence, no change
We unplugged GT404 (screen lead), no change
No secondary voltages (e.g. vert ic source) on T432 which is supposed to provide 13.5, -13.5, and 38v
Voltage on Q423 in the primary of T432 is about 113v on e, b, and c and transistor checks ok. R431 checks fine.

We have service manual. Troubleshooting chart doesn't seem too helpful.

Any help appreciated.
Google

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_James
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PostPosted: Tue Sep 22, 2009 10:56 am    Post subject: Reply with quote

FWIW, the last Akai we did (PT5499HD) with a similar problem was the FBT.
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