Toshiba 6643
- radiantsvgun
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Toshiba 6643
I have two of these chassis that need repair. I would like to try to repair them instead of sending them out.
First one was displaying a bleeding picture, changed all caps including the filter. Worked for a little bit and then went into vertical collapse.
Second I received as-is, no picture, but does sound like its getting power. I plan to start with caps on this one, but most Toshibas I recap always seem to have another failure after a recap.
Any ideas on where to start? Repairing Toshibas is a new area for me.
First one was displaying a bleeding picture, changed all caps including the filter. Worked for a little bit and then went into vertical collapse.
Second I received as-is, no picture, but does sound like its getting power. I plan to start with caps on this one, but most Toshibas I recap always seem to have another failure after a recap.
Any ideas on where to start? Repairing Toshibas is a new area for me.
- grantspain
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Re: Toshiba 6643
replace the vertical ic and check the cap values around it and the tracks
- radiantsvgun
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Re: Toshiba 6643
To confirm, these vertical I/C is LA7838 ?
- grantspain
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Re: Toshiba 6643
that is a vertical ic yes
- radiantsvgun
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Re: Toshiba 6643
Found it, it is the LA7838. It is in an awkward spot but I should be able to manage. I will order some and let you know how it goes.
- grantspain
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Re: Toshiba 6643
delicate tracks on that ic so be wary
- radiantsvgun
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Re: Toshiba 6643
For some reason this chassis blew both replacement I/Cs.
I'll be sending that one out, the other I will start with a full recap, and order more I/C and some HOTs.
I'll be sending that one out, the other I will start with a full recap, and order more I/C and some HOTs.
- radiantsvgun
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Re: Toshiba 6643
Follow up:
I had these repaired by a shop-
First one- some mylar caps had gone bad, and needed HOT and IC.
Second one- needed caps, IC, HOT, and reflow in some areas.
I had these repaired by a shop-
First one- some mylar caps had gone bad, and needed HOT and IC.
Second one- needed caps, IC, HOT, and reflow in some areas.
- yosai
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Re: Toshiba 6643
Thanks for the update. I've got three of these chassis and the only one that works is in dire need of some TLC.
- mukurop
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Re: Toshiba 6643
May I know what are the mylar caps wich were replaced? Those caps usually not fail but if they are done can cause lots of damage.radiantsvgun wrote: ↑September 17th, 2021, 7:54 pm Follow up:
I had these repaired by a shop-
First one- some mylar caps had gone bad, and needed HOT and IC.
Second one- needed caps, IC, HOT, and reflow in some areas.
- radiantsvgun
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Re: Toshiba 6643
I've reached back out with no response so far. They told me the ones that were bad were split in half- so they had physical damage.mukurop wrote: ↑October 25th, 2021, 10:48 amMay I know what are the mylar caps wich were replaced? Those caps usually not fail but if they are done can cause lots of damage.radiantsvgun wrote: ↑September 17th, 2021, 7:54 pm Follow up:
I had these repaired by a shop-
First one- some mylar caps had gone bad, and needed HOT and IC.
Second one- needed caps, IC, HOT, and reflow in some areas.