Need help with a TV...

[Geoff Bourquin]

I'm going to guess it is in the module in the middle of the signal board, About 6 inches long and an inch thick, enclosed in a metal case. There are some surface mount electrolytics in there that are probably bad. (4 of them I think).
Unsolder this module and remove it from the signal board, then open it up and replace these 4 caps. I usually just use a good quality radial lead cap rather than putting in new surface mount jobs. There is enough room if you are patient.
I hope I'm thinking of the same chassis as you are.

[rcaman]

geoff you are right about the comb filter board. but those caps can be a real pain to replace. a good tech has to be carefull with those tiny traces. steve

[PioneerGuy75]

Thanks for the input

However, the color does work fine in the little PIP screen....and anywhere the little screen is moved looks fine.

I will look for that board today and see if I can see what you are talking about.

Many thanks!

[PioneerGuy75]

Does anyone know if there is a way to switch this unit into a "Tech setup" mode where I can fine-tune convergence etc?

I have been through the setup mode in the main menu but no help.

[Findm-Keepm]

What's the Model/Chassis? Hitachi's Service manuals were free a few years back - HitachiServiceUSA website. I mirrored their website and got 19 Gigs of PDF manuals and training information for their TVs from 1983 to 2000. I may have the manual or training info in PDF here somewhere with all of the maintenance info.

Cheers

[Findm-Keepm]

I uploaded two 50" Hitachi models from 1993 to my website - I'll keep the link active until Tuesday evening, as I have to pay for excessive d/l bandwidth. Both chassis are in one manual and are large - 25megs or so.




Both are AP31/AP32 chassis, to my recollection the only projection chassis that year. Convergence information is in there, as is the rest of the service info. I'm no projection tech - just a resource for Hitachi Manuals.

Cheers

[Findm-Keepm]

Thanks for the quick PM - it's posted as listed in the PM.

Cheers

[Duane]

Originally Posted by PioneerGuy75

Does anyone know if there is a way to switch this unit into a "Tech setup" mode where I can fine-tune convergence etc?

I have been through the setup mode in the main menu but no help.

This link states that the adjustments are inside the set vs. digital,onscreen menus.If you get a service manual, then it would show those controlls.

http://myweb.accessus.net/~090/how2adj.html#5.7

[PioneerGuy75]

Originally Posted by Geoff Bourquin

I'm going to guess it is in the module in the middle of the signal board, About 6 inches long and an inch thick, enclosed in a metal case. There are some surface mount electrolytics in there that are probably bad. (4 of them I think).
Unsolder this module and remove it from the signal board, then open it up and replace these 4 caps. I usually just use a good quality radial lead cap rather than putting in new surface mount jobs. There is enough room if you are patient.
I hope I'm thinking of the same chassis as you are.

Thanks Geoff

Well, now I am in DEEP.....I took comb filter module out, opened it up but don't recognize the caps you are talking about. If they are the "little metal cans" with a black stripe on one side (These are the closest cap looking components on here.), I count 20

How do I determine the value of these and more importantly, where would I get replacements ?


Thanks so much for your help, I am pretty familiar with electronic stuff but this is like "Micro-Surgery"


Thanks again for your assistance and hope to hear back soon.

[PioneerGuy75]

A couple of pictures if it helps...