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Discussion Starter #1
hope someone here can help us out...

Our 7 year old SD533HD5 finally bit the dust a couple of weeks ago. It has been a fantastic tv and we really would love to keep it in the family.

Anyway....over the last couple of years it has exhibited the dreaded 'not coming out of standby' problem, easily fixed by replacing the 4A 125V fuse in the power board. This would usually happen after a power outage or if somebody switched on the TV within 5 mins of switching it off.

The most recent time this happened however the fuse fix did not work and it would repeatedly blow the replacement with the 'def assy' fault led lit on the power board.

So I read up on here and other places that the most likely cause was the convergence amps. So I ordered 2 stk392-180's from ACME plus a replacement for a diode that had discolored the PCB right next to the blown fuse.

I replaced the chips and diode, checked my work for spills/bridges and loose connectors and put it all back together.

After powering up the tv stayed on green for several seconds longer than before then reverted to standby. I switched the power on and the fuse promptly blew. I replaced the fuse and tried again...this time we got picture but the convergence is shot....especially blue...also no sound on any input.

hmmm....faulty convergence IC's? or did they just blow again as something in the possibly faulty power supply shoots too much current?

Funnily enough we never had any convergence issues with the tv before it died.

Any ideas guys?

thanx : )
 

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Plain ole user
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Did you check the related resistors and fuses, resolder the many weak solder joints on the convergence, deflection, and power supply boards? Pioneer sets are notorious for having dozens of cracked solder joints on each board. This can cause other failures, including convergence amps. Read the first ten posts in the convergence repair thread very carefully.

Your post will be moved to the Pioneer forum to maintain forum organization.
 

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Discussion Starter #3
thanx : )

I'll pull it all out again and recheck.

Didn't see any damaged parts on the deflection board...all resistors look perfect but there are a couple of bits of heat discoloration around a core near the big transformer and the before mentioned diode on the power board. I'm thinking my problem is likely on there though I hope it did not additionally blow the new ic's :foottap: I can get my hands on a refurb power assy for $149 which could be a better way to go...


This standby problem always happened after cycling the power button within a few minutes of switch on/off. Would that indicate a power supply problem as opposed to convergence?

thanx again....hope I can raise it from the dead!
 

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Plain ole user
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thanx : )

I'll pull it all out again and recheck.

Didn't see any damaged parts on the deflection board...all resistors look perfect but there are a couple of bits of heat discoloration around a core near the big transformer and the before mentioned diode on the power board. I'm thinking my problem is likely on there though I hope it did not additionally blow the new ic's :foottap: I can get my hands on a refurb power assy for $149 which could be a better way to go...
I never make any assumptions about a pioneer before resoldering dozens of connections. A refurb board may still need considerable soldering.

This standby problem always happened after cycling the power button within a few minutes of switch on/off. Would that indicate a power supply problem as opposed to convergence?

thanx again....hope I can raise it from the dead!
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