(Topic ID: 84703)

Dr Who No Inserts Lights (still struggling)

By demetris74

10 years ago


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  • 42 posts
  • 13 Pinsiders participating
  • Latest reply 10 years ago by demetris74
  • Topic is favorited by 5 Pinsiders

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PDB c6-c7.jpg
208940-i.jpg
wpc89-18Volt-2.jpg
wpc89-18Volt.jpg

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#23 10 years ago

If 12V regulated is present on TP3, then F114 and BR1 are OK.
You are missing the through hole connection marked with red dot on C7, going from back to the front side of the PCB.

Also make sure BR1 and C6 have proper connections on both sides of the PCB, but C7 (+) is causing the problem.

wpc89-18Volt.jpgwpc89-18Volt.jpg
#26 10 years ago

I do have the complete board but it's still in progress.
The picture used in this topic was edited and cropped. The original has no traces or colors.
In time it will be downloadable in hi-res.

Good luck with the repair, it's a lot easier now

#29 10 years ago

not really strange, in this picture you can see LED6 gets its power directly from BR1 (trace at component-side).
C7 is connected to BR1 with trace at solder-side (dark red) and is continued to C6 at component-side which is directly connected to TP8.

again, I really think you are missing the through-hole connection between back and front side of the PCB at C7+wpc89-18Volt-2.jpgwpc89-18Volt-2.jpg

#33 10 years ago

thanks for the compliments faz, however, it is just a bitmap with no interactive options. I use it for making notes when repairing a PDB, mainly to keep up what parts have been replaced.

Demetris74, don't make the problem more difficult
Here is what you can do the easy way :
- Remove C7 + C6
- use a blank copper wire (not too thick) and insert it from component-side in through-holes C7+ and C6+ and
leave 0.5 inch of the wire on the back side.
- scratch some insulation halfway C7 and C6 from trace on component-side and solder the wire to it.
- place the capacitors.
- solder them together with the wire on back-side.

let there be light
PDB c6-c7.jpgPDB c6-c7.jpg

#36 10 years ago

no problem demetris74,
you have continuity from C7+ to C6+ to TP8 to Q91-Q98 but,
it has to be connected with BR1+ (see my second picture).
and C7+ C6+ are impossible to solder properly on component-side so you need this stitch.
Also i'm not sure exactly what you read on the DMM, is it a trace or low impedance from 2 uncharged capacitors.
This way you know 100% sure that you have continuity and the 2 cap's are connected to pcb.
You know my advice

faz, I do know the importance, these pictures are great help on location or at the workbench and is why i made this.
Especially on locations with poor light and printed on 15x22 inch there's no timeloss of searching in bad printed manuals.
Maybe in the future with a transparent trace overlay but it costs loads of time to create this.
First I need to finish these, digital watermark them and make it/them downloadable.

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