Re: usp440m-42lp issue AKAI PDP42Z5TA



Paulstef,
I tried your suggestions and still no luck.
I don't have comprehensive bench test equipment, so I'm stuck.

Could I hire you to repair this board? You had the learning curve on this one, so might easier a second go aroound?

Pls let me know if you can and rates. I'll ship to you if terms are agreeable.

Thanks,
Harrison Smith...

Re: usp440m-42lp issue AKAI PDP42Z5TA

My apologies for such a long time away. We were out of town for a couple weeks, and a few other home projects required immediate attention, such as a leaking toilet ...

I replaced all these caps, still won't turn on. I can hear a relay or something else clicking on and then off. Also, it is stuck between Standby and On. The indicator LED goes from red to off, but does not turn green. I have to remove it from AC power to retry.

Any other suggestions?

Re: usp440m-42lp issue AKAI PDP42Z5TA

More basic questions.
I know I need to get replacement caps with matched capacitance, and here with correct max temp (shown as 105C).

I think I can use ones with higher voltage rating for same capacitance?

Also, I found there are many subproduct families, I guess with circuit targeted properties. For instance, Nichicon has VZ, PS, PW etc families.
Are there other properties I should consider besides the max voltage and dimensions?

Thanks.

Re: usp440m-42lp issue AKAI PDP42Z5TA

I think I may have misled you with my description of circuit degradation. I think it is the same problem. When switched from STANDBY, the front LED goes from red to green momentarily, then extinguishes. Sometimes, five to ten minutes later, the set will then power on, as the LED goes solid green and the screen becomes fully energized.
In my very limited troubleshooting experience, I thought caps as they store that ‘kick’ to start the HV circuit leg. But then again, I remember this from CRT flyback circuit, so its likely arcane...

Re: partial schematic



PaulStef,
I won't pretend to be as experienced as you or most of the techs that post on this site. I do, however, have the same PS problem with USB440M-42LP, and want to fix it. As an EE, I follow (and can appreciate) the time put into troubleshooting judging by the schematics you drafted. I guess that MoSFET 5060 is hidden behind the heatsink plate.

I don't, however, have access to a test bench anymore, so I am placing my confidence in your expertise. If I can offer any help, I'd like to try. As the original owner of...

Re: Intermittant power on - 42" Viore plasma



I know this is an old post, but if possible, can you tell me if you were able to repair this board? If so, what was replaced or repaired. Thanks....

Re: Intermittant power on - 42" Viore plasma



I know this is an old post, but if possible, can you tell me if you were able to repair this board? If so, what was replaced or repaired. Thanks....

Re: New Members - please post your introductions here

I'm looking forward to tapping some synapses here. Unfortunately for y'all, my rap sheet is probably like a bunch of members. I became an electronic engineer some 30 + years back when the net was that thing dangling from a B-Ball hoop or snaring fish, unless you worked for DARPA. But I have followed the charmed path of a computer geek, all the way from mainframe to wristwatch. I began by punching IBM cards and breadboarding logic using Intels 8085s as an undergrad. Now look around. This profession is amazing and blossoming with...