Re: Grundig Xentia 82 (MFW 82-490) (CUC 1931) - intermittent blue Blue
I'm happy to close off this thread as I managed to resolve the issue myself in the end.
As described in the symptoms above, things would be good for a while after opening and attempting to service. So the act of something moving around would help temporarily.
Later I noticed in the hotter months, the colour failed less often. Cooler days the colour would fail more. Got me thinking about metal expansion making better contact.
In the end, I resolved it by re-soldering...
sausagejohnson
Member
Last Activity: 03-28-2021, 03:05 AM
Joined: 12-16-2016
Location: Canberra
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Re: AKAI CTV29TA weird standby
@petehall347 gosh a crt of that era is even before my time!
@R_J, yes the ICs match a few on both of those schematics, and the RCA/SuperVHS panel matches both.
I've saved both those out for future reference.Leave a comment:
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Re: AKAI CTV29TA weird standby
Thanks, R_J and ducky29. Looks you guys nailed it.
It was the power supply / vertical deflection ic.
It led me to this link:
[url]http://www.riddledtv.com/journal/Vertical/[/url]
Now, I had already reflowed the solder on these pins before, so this time I removed most of the solder with a braid and added new solder.
Fired up the TV and let it run for a while before going into standby.
Couldn't believe my eyes that it went to standby cleanly.
The only thing......Leave a comment:
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Re: AKAI CTV29TA weird standby
Oh right yes. OOps
[ATTACH]149641[/ATTACH]
Also a couple of shots of the power area for reference:
[ATTACH]149642[/ATTACH]
[ATTACH]149643[/ATTACH]
And the mainboard numbers:
[ATTACH]149644[/ATTACH]
Though I realise the CTI-600V is more about the board wafers. Not sure if any other number is the board model.Re: AKAI CTV29TA weird standby
Oh right yes. OOps
[ATTACH]149641[/ATTACH]
Also a couple...Leave a comment:
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Re: AKAI CTV29TA weird standby
Intersting, I could not locate any ICs in the power area.
But other ICs on the main board are:
* Panasonic NN5198K 243P3101
* Toshiba TA8859CP 222KB11
* Samsung N322 S3P8849XZZ-AQB9
* Philips HEF4052BP AE073 PE Un03226
* AN5891K 2D9
* ST CHN L 24C04 6 K3K331
I'll get some clean shots of the power area.Leave a comment:
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Re: AKAI CTV29TA weird standby
Hi R_J, will do thanks. I'll get some numbers and compare.
@llonen. Due to the danger of working with this set while live, I'll probably just replace all suspect components, rather than test.Leave a comment:
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Re: AKAI CTV29TA weird standby
Hi R_J, sorry I meant there is only one switch at the front.
Pressing that is instant on or off. The only way to come in and out of standby mode is with the remote. If the TV is off, the remote cannot control the TV.
I am impressed you found that schematic! Do you mind if I ask if you found that publicly or is it via a repair subscription? (oh it might be different ok)
This might confirm what you said: When going to standby, I don't hear any relay. The closest thing to a relay sound is only when powering on or...Last edited by sausagejohnson; 01-22-2017, 07:57 PM.Leave a comment:
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Re: AKAI CTV29TA weird standby
Thanks Andrew, perhaps I'll look to swapping the caps in the power supply area.
I also gave the three relays a taps with the edge of a bit of off-cut wood. Didn't want to hit them too hard. But it made no difference. But perhaps it might be worth swapping the relays as well?
Been all over the net to try and get a schematic or service manual but nothing so far.Leave a comment:
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Re: AKAI CTV29TA weird standby
Hi llonen, when pressing the switch at the front of the TV, it is an instant off. So it doesn't have the same odd effect.
Hi R_J, thanks for that. I'll try giving it a tap or two. I'll look around for a schematic.Leave a comment:
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AKAI CTV29TA weird standby
Hi Guys, trying to look into a problem with my Akai CTV29TA TV when pressing the remote standby button.
If the TV has been on for a few minutes and it is well warmed, then if I put it into standby, I get this 'box' effect, then the display goes down to a single raster line that very slowly shrinks inwards.
Takes around 30 seconds to fully go into standby mode.
The operation for the rest of the TV, including viewing is perfect.
I am guessing the trouble is perhaps around the flyback unit, or surrounding caps.
I have reflow... -
Grundig Xentia 82 (MFW 82-490) (CUC 1931) - intermittent blue Blue
Hi Guys,
First post. I have been trying to fix this Grundig Xentia 82 CRT TV for some time with mixed success. The schematics for this TV and it's various boards is available here:
[B]Problem:[/B]
The blue information from the TV signal and video inputs is missing intermittently. Red and Green are rock solid.
[B]Points to note:[/B][LIST][*] The blue from the setup menu is still present which rules out a problem with the blue gun. Possibly also rules out a problem with the CRT Panel.[/LIST]
[B]Boards in the TV:[/B][LIST][*]... -
Re: New Members - please post your introductions here
Hi Guys, I am new and have been using this forum on and off for a little while, mainly to check on caps with low ESR, and to get general advice. I am working through a run of old TVs and monitors that need minor repair so I will chime in from time to time on those.Leave a comment:
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