| Author |
Message |
| tofutofu |
 Posted: Thu Jan 26, 2012 3:51 pm Post subject: |
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resold T753, T751 and T601. no change
is it possible that the MCU is malfunction? |
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| tofutofu |
| Posted: Thu Jan 26, 2012 6:35 am Post subject: |
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| jts1957 wrote: |
C707 is/was one ... C701 is NOT the other ... That leaves C___ as the 2nd?
The solder connections on the two transformers mentioned earlier are infamous for developing "rings" around one or more pins. As are some of the smaller transistors on that same board. |
C707 is the one, and C703 is the other..
I will resolder the T752 and T751 and let u know. but I believe that's not the problem as at starting time/BLT_ON 3.3v, the bulbs working fine .. |
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| jts1957 |
| Posted: Thu Jan 26, 2012 2:01 am Post subject: |
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C707 is/was one ... C701 is NOT the other ... That leaves C___ as the 2nd?
The solder connections on the two transformers mentioned earlier are infamous for developing "rings" around one or more pins. As are some of the smaller transistors on that same board. |
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| tofutofu |
| Posted: Thu Jan 26, 2012 1:11 am Post subject: |
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a pic of the board:
 |
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| tofutofu |
| Posted: Thu Jan 26, 2012 12:40 am Post subject: |
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your right about C701, that looks OK , I ment C707.. 
19.6v when no signal
~18.5v when off (not steady)
19.4v-19.6v when on/start {going slowly up} (with signal) |
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| jts1957 |
| Posted: Thu Jan 26, 2012 12:26 am Post subject: |
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| tofutofu wrote: |
OK 
unsolding one "leg" of L701, gave 18.5V between common of Diode (C703 positive) and ground (C703 negative). |
Stayed steady regardless of signal or set being turned on/off?
C701's not even an electrolytic - can you post a pix? |
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| tofutofu |
| Posted: Thu Jan 26, 2012 12:18 am Post subject: |
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| by the way, C701 & C707 are 2 cap's I replaced as thay looked "puffed" |
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| tofutofu |
| Posted: Thu Jan 26, 2012 12:11 am Post subject: |
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OK
unsolding one "leg" of L701, gave 18.5V between common of Diode (C703 positive) and ground (C703 negative). |
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| jts1957 |
| Posted: Wed Jan 25, 2012 11:46 pm Post subject: |
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| I mean unsolder one end or the other and letting it float not touching anything while remeasuring at common of Diode. |
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| tofutofu |
| Posted: Wed Jan 25, 2012 11:42 pm Post subject: |
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"Float" either end of L701" ??
do you mean connecting between the 2 ends with some wire? |
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