View Full Version : Sony XBR Questions


user181
04-24-2017, 01:26 PM
I have a Sony XBR widescreen CRT HDTV, and when I went to turn it on this past Saturday, it wouldn't power up. The red "timer/standby" LED blinked in succession 20 or 21 times for the two instances I tried to turn it on.

I have the official Sony service manual for my model, and see that the self-diagnostics give statuses for up to 7 blinks, but nothing more.

I found a tidbit of info on the Sony website recommending to unplug the power cord to the set for a little while and then plug it back in. I tried that and the set has worked ever since, but I am wondering what the problem could have been, and/or if this is a symptom that is indicative of something that needs to be addressed/fixed.


Also, I am considering purchasing a set of boards for this set to have as spares. Does anyone have any good sources for new/refurbished Sony boards to recommend?


Thank you!

Eric H
04-24-2017, 03:07 PM
TV's today are basically Computers, Computers sometime lock up for reasons unknown and have to be reset, I suspect that's all that happened to yours.

I run my Panasonic off an uninterruptible power supply to filter out the surges and brown outs in the AC Supply, I don't know if that would help but it can't hurt.

Electronic M
04-24-2017, 03:52 PM
I've had such a set for ~5 months. In the first month or so it did the same thing yours did then was back to normal after being unplugged a few min. It has not relapsed yet :thmbsp: so I'd say it was probably a microprocessor glitch that needed a reset...Remember than the CPUs and code in most consumer gear are not designed forever without crashing and needing a reboot.

user181
04-24-2017, 04:42 PM
I've had mine for almost 9 years (5 years on a UPS) and never had an issue. I'm content if it was just a one-off peculiarity.

Findm-Keepm
04-24-2017, 05:14 PM
Anything beyond 5 blinks on a Sony is power related - but with NO MODEL NUMBER posted, you'll get nuthin' from me.

http://www.videokarma.org/showpost.php?p=3152065&postcount=1

Sony made over 370 XBR models (just the index in the ESI software, there may be more)

You gotta give us some meat. Some of us have beaucoup experience with Sonys and could offer help....

user181
04-24-2017, 05:18 PM
Anything beyond 5 blinks on a Sony is power related - but with NO MODEL NUMBER posted, you'll get nuthin' from me.



http://www.videokarma.org/showpost.php?p=3152065&postcount=1



Sony made over 370 XBR models (just the index in the ESI software, there may be more)



You gotta give us some meat. Some of us have beaucoup experience with Sonys and could offer help....


Sure thing -- I apologize for leaving that out.

It is a KD-34XBR970.

I would love to get as much information as I can about it.

Thanks!

zeno
04-24-2017, 05:56 PM
Hopefully it was micro lock-up........

BUT these sets had one fatal weak point. If yours is one it
uses 2 identical IC's. One in the STBY power supply & another
in the RUN power supply. They fail left & right.
Symptoms are dead set and or hard starting getting worse with time.
I had the 30" model & the 4th set went bad in 5 yrs. There was never a cure from Sony. The spare boards were all used up in < a year IIRC.
Fix is to replace BOTH IC's & install IC sockets so you can swap
them fast next time. One last thing is to watch out for bootleg IC's.
Ask around for advice before ordering any.

Good luck with the set. IMHO it had the best pix on any set ever.
I sure miss mine.....

73 Zeno:smoke:
LFOD !

Chip Chester
04-24-2017, 07:51 PM
This went out on my KV25XBR back when there were TV repair shops. Not seen much use in the last 10 years, but so far so good. Have a parts set...

Chip

Findm-Keepm
04-24-2017, 09:21 PM
EDIT: OOPs! Wrong series of chassis - huge difference in what my train of thought was. Your set uses the MCZ3001DB....I've always found it best to swap the D board, or go for the chip swap, but socket them and get spares.....


Genuine MX0841's ain't cheap no more:

https://www.encompassparts.com/item/2691775/Sony/8-729-041-12/Transistor_Mx0841-ab-f

Nor are the MCZ3001DB chips:

https://www.encompassparts.com/item/5932375/Sony/6-705-810-01/Ic_Mcz3001db

I depleted my supply of them long ago - I still have two 2SC4834s for the smaller screen stuff.....

Those two chips are why I've junked more Sonys in the last 4 years. You can't go cheap with anything but the genuine Sony parts - the Chinese have mastered the fakes, and they don't hold up.

The ESI disc has a service bulletin for finding true MX0841's using capacitance of all things - the C-E junction has to have a certain picofarad value. Of 7 I had, only 3 checked out OK - the rest were obvious fakes already, but it validated the capacitance check as a way to rule out the fakes. I never got a fake from Tritronics (now Encompass, aka a Wall-Street-Run parts place....)

user181
04-26-2017, 11:58 AM
Thanks for the information. I will stock up on some ICs. Briefly, what is the function of the MCZ3001DB?

Also, would you be able to share any relevant service bulletins? (Or point me to a resource to purchase, if it's proprietary/copyrighted).

Thank you!

Zenith26kc20
04-27-2017, 05:18 PM
The IC's are part of power supply supplies. As mentioned earlier, be careful! No buying from our favorite auction site. The fake ones can fail rapidly or, in some cases, cause plenty of smoke, noise and sparks. I junked my super fine pitch 34' because of the chips. It was an incredible set when it worked!
And theft proof!

user181
04-27-2017, 05:47 PM
The IC's are part of power supply supplies. As mentioned earlier, be careful! No buying from our favorite auction site. The fake ones can fail rapidly or, in some cases, cause plenty of smoke, noise and sparks. I junked my super fine pitch 34' because of the chips. It was an incredible set when it worked!

And theft proof!


I ordered some from Encompass Parts -- hoping they are genuine.

Out of curiosity, what is the manufacturer of the genuine chips? The photo on the Encompass website shows "Shendengen" on the chip -- is that legitimate?

andy
04-28-2017, 02:40 AM
I ordered some from Encompass Parts -- hoping they are genuine.

Out of curiosity, what is the manufacturer of the genuine chips? The photo on the Encompass website shows "Shendengen" on the chip -- is that legitimate?

You can't go by manufacturer because the counterfeiters mark them with the name brand. Sometimes a careful side by side comparison to a known genuine part will reveal a counterfeit, but it's not conclusive. Sometimes the genuine manufacturers change their markings, and some of the counterfeits look really good.

Findm-Keepm
04-29-2017, 12:21 AM
You can't go by manufacturer because the counterfeiters mark them with the name brand. Sometimes a careful side by side comparison to a known genuine part will reveal a counterfeit, but it's not conclusive. Sometimes the genuine manufacturers change their markings, and some of the counterfeits look really good.

Encompass (the old Tritronics) sources their stuff from Sony. They are ISO Supply-Chain certified and anti-counterfeit/gray market certified as well. Just expensive, unlike the old TriTronics. We could call and get the same sales lady each time, but not so now. Tritronics, MAT, MCM (pre-Premier/Farnell), ASTI, and Fox were all the independent dealer needed back in the late 80s/90s/00s.....enter Orion and Funai and splat! No support or accessibility.

And yes, Shendengen made the originals.

rcaman
04-30-2017, 07:35 PM
the last i got from encompass was junk and went up in a fit of sparks. and encompass would not warranty them i no longer buy ANYTHING from encompass.

user181
04-30-2017, 09:52 PM
the last i got from encompass was junk and went up in a fit of sparks. and encompass would not warranty them i no longer buy ANYTHING from encompass.


Is there another supplier you'd recommend?

Findm-Keepm
05-03-2017, 11:00 AM
the last i got from encompass was junk and went up in a fit of sparks. and encompass would not warranty them i no longer buy ANYTHING from encompass.


248 dollars of parts (mostly 2SC4834s, MX0841s, and one lamp ballast board for aDLP set) from Encompass so far (since 2012/3), and all are genuine, but even genuine parts will fail if the original problem isn't fixed - whatever caused the original part to fail will take out any replacement.

What genuine Sony replacement source do you suggest, or use? Hard to find any Sony parts in North America anymore, much less genuine without going with Encompass - expensive they are, but original and genuine.

user181
09-26-2017, 12:44 PM
I'm following-up on this issue that I originally posted in April (Sony KD-34XBR970, having trouble starting up).

The issue first occurred in April, then again in early August, and yesterday (late September), and each time I was able to resolve things by briefly unplugging AC power to the set.

I have read everything you guys have posted about the MCZ3001DB chips being the likely culprit, and I've also taken note of the fact that there are counterfeits out there to beware of. Way back in April I preemptively purchased some chips from Encompass Parts, as well as proper sockets for them. So, I'm prepared to replace them when the time comes.

However, part of me has a nagging feeling of wanting to be certain this is the correct thing to do.

Are there any measurements or tests I could do (without specialized/proprietary equipment) to verify if the chips are good/bad? Is there a typical separate root-cause for these chips to fail, or is the problem the chips themselves?

Also, since I'm able to get by -- for now -- by power-cycling the set, I'm hesitant to risk making things worse by messing with it. What general advice do you guys have for making such a repair? I'm relatively proficient with soldering/desoldering, but I have never worked on a CRT TV. Do I need to discharge the CRT before proceeding to work on the D board? I'm sure the answer is 'yes,' but I could sure use some guidance on that.

From the service manual for this particular set, it seems that some of the boards can flip or hinge for service access. Is that the case for the D board, or is it best to completely remove the board from the set and do the chip replacements on the bench?

I know I've asked several questions, and I sincerely appreciate your patience and bearing with me.

zeno
09-27-2017, 08:56 AM
There are 2 power supplies. One is always on & supplies
the micro & on/off relay ( if it has one.). Second one supplies
B+ for horz/HV. Its on/off is via a relay or other method.
You will need a schematic for at least the power supplies
to check them & see if one isnt working.

Use care changing the IC's the board is double sided & you will
probably lift some top etch. If you have very small dikes
you can try nipping off the IC pins & saving the etch. Otherwise
you will need jumpers.

We were a authorized Sony dealer / warranty station at that time.
Never seen a bulletin on the problem & Sony TA changed the subject !
It was common, I had the 30" & went through 3 sets in abt 5 yrs.
Shame of it is the 30 & 34" widescreens were the best CRT sets
ever made pix wise.

good luck Zeno:smoke:
LFOD !