CurtPalme.com Home Theater Forum

AFryia · Posted: Sun May 04, 2008 2:57 am Post subject: G70 SOS

I'm not getting any image of any sort from my G70. No warm up screen no A or B input, not even the menu will display. Sad

None of the tubes light up and I have no error code. The "Index" dial is set to "1" I've re-seated every board.

It was working yesterday just fine. Mad

Anyone experience something similar

**AnalogRocks** · Posted: Sun May 04, 2008 4:18 am Post subject:

Shot in the dark ( pun, sorry )...is there power at the plug? How about the fuses in the LVPS?

ecrabb · Posted: Sun May 04, 2008 2:16 pm Post subject:

Does it fire up and run the fans? Is the power LED lit on the back of the set?

SC

AFryia · Posted: Sun May 04, 2008 2:51 pm Post subject:

**Curt Palme** · Posted: Sun May 04, 2008 3:04 pm Post subject:

Probably a bad Pa board, but with a fault that isn't triggering any error code. A No HV situation due to a lack of 115 volts on the Pa board will cause an error, but if the 115 volts is there, the set assumes that the HV is also there, and therefore won't trigger a fault code.

Pull out the Pa board and check for bad solder joints, otherwise feel free to send it up for repair and testing.

NewbieDAN · Posted: Mon May 05, 2008 1:28 am Post subject:

I've found the PA board itself can get quite a 'curve' in it if you have it ceiling mounted, rip it out and re-seat it. Hopefully something simple.

ecrabb · Posted: Mon May 05, 2008 2:27 am Post subject:

When I was doing the research on the errors my machine supposedly had, it was pointing back to the Pa board. So, when I went searching for Pa board info, I found a lot of threads on it over at AVS. Seems like the Pa board is a real weak point on the G70. There were several threads and users who said their Pa boards had failed just after they'd done full convergences and were stressing it with contrast and/or geometry adjustments. There was one thread I found that even described the specific diodes that got so hot they unsoldered themselves and fell right out of the board. I don't remember what fails that causes the diodes to heat in the first place, but if you search one of the AVS archives for "G70 PA" you might find the thread.

SC

**Curt Palme** · Posted: Mon May 05, 2008 4:38 am Post subject:

I don't really buy that the PA board is weak. It runs very cool normally, and massive convergence correction won't change the way the Pa board works, (I don't thnk) as the power supply for the convergence and focus board doesn't come from the PA board. I think failures start due to age and HV arcing around tubes. I've had in a bunch of G70s (maybe 6?) over the years with 8000 hours+ on them with no PA board issues.

I know repairing them is a bitch as a number of the parts that die are relatively expensive, and a number of the parts with the same part number by a different manufacturer will overheat. Subbing parts with another number give worse results, so it's a royal PITA. You don't want to know the $$ of the original Sony part numbers either.

noackm · Joined: 16 Jul 2007 Posts: 25

Hopefully this is only minor error. Did you check Contrast and Brightness, i`ve done once both to minimum and i did no see anything at all. Is there also no Menu if you push the internal remote menu button? On the other side if repairing is so expensive, then it is probably easyer to buy another G70.

**Curt Palme** · Posted: Mon May 05, 2008 1:06 pm Post subject:

You can do that, but who knows that the next G70 won't have the same board or another one close to failure as well? Yes parts and labor are expensive (seen gas prices lately?), but then at least you know the weak parts have been replaced with brand new ones and should last the life of the set.

AFryia · Posted: Tue May 06, 2008 2:22 am Post subject:

Curt,

I put my spare PA board in and now the machine powers up with an error 33 "abnormal high voltage". I know this one is good (was Shocked

) I don't hear any arcing on power up.

With this PA board the tubes lit up for 1 second then the PJ shuts down. With the original PA board the tubes just would not light up and the set kept running fans and LED's.

What should I look for next. I have a complete second set of boards.

**Curt Palme** · Posted: Tue May 06, 2008 2:33 am Post subject:

It could be that the PA board is not calibrated. As with the NEC sets, you can't just drop in another HV board, as each one is calibrated to the set. So, assuming there are no other issues, either

1) Get the original board repaired
2) Get an HV probe, some new trimpots to replace the sealed ones that you need to adjust, and align the HV section to spec as per the service manual.

Cheers!

AFryia · Posted: Wed May 07, 2008 2:39 am Post subject:

winduptoy · Posted: Wed May 07, 2008 3:16 am Post subject:

I know you're an experienced CRTer, but are your lenses all wired?

**Curt Palme** · Posted: Wed May 07, 2008 12:47 pm Post subject:

AFryia · Posted: Thu May 08, 2008 1:47 am Post subject:

I'll package it up and ship it out this weekend.

Your address still the same ?

Anthony

**Curt Palme** · Posted: Thu May 08, 2008 12:58 pm Post subject:

Here ya go:

http://www.curtpalme.com/ContactUs_Shipping_Parts.shtm