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pfrcom

Junior Member
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Posts: 9
Reply with quote  #16 
Update on STB18HD:

Weather a bit inclement in Melbourne tonight

No reception on TV connected via STB18HD's RF Loop Through

Same from STB18HD itself

But no problem with TV if I disconnect antenna cables from STB18HD and connect them to each other

Also, "MTV DVB-T Receiver" set top box in another room has no problem

 
STB18HD emphatically not recommended
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AQUAR

Member
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Posts: 75
Reply with quote  #17 
Could just be an issue of insertion loss due to the loop through.
Maybe try to boost the signal.
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pfrcom

Junior Member
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Posts: 9
Reply with quote  #18 
After the disappointing STB18HD, next thing I tried was to resolder all connections from tuner module (marked DNOT44QZV262A) to the TRF-7160 board

Easier said than done - whatever lead-free solder was used by manufacturer, it sure is difficult to melt [rolleyes]

After that, I had reception [thumb]

Elation didn't last long - a day later, "Service not running or scrambled" [bawl]

I also finished replacing the board's electrolytic capacitors, using Chemicon KY all around - here's the "After" pic:

TRF-7160_aft.jpg 

As well as that, I used Chemicon to replace some of the Samwha and Sam Young (both Korean makes) electrolytic capacitors in its power supply after seeing opinion here: https://forum.toppy.org.uk/forum/viewtopic.php?t=20946&sid=bf8cd62b2de734f08f75e186854993b0

Finally, disappointed although not surprised, still "Service not running or scrambled" [mad]

My conclusion to anyone following this - don't waste time trying to fix "Service not running or scrambled" problem when it goes hard-on, there is a reason why Topfield is defunct

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AQUAR

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Posts: 75
Reply with quote  #19 

Mate,

If you read the threads on this scrambled service issue you will note the one thing that you didn't do to try and restore this toppy.
This is most likely an issue with the BGA solder connections.
Heat up the heatsink of this BGA SOC as described elsewhere in this forum, to potentially restore the toppy to working condition.  
Using a mini gas torch worked for me.

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pfrcom

Junior Member
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Posts: 9
Reply with quote  #20 
Thanks AQUAR, you're correct - maybe I spend too much time on badcaps.net forums [redface]

I did intend to have a go at the board with hot air once I got to the point of deciding the machine was worthless

But until then I was trying potentially non-destructive fixes

Seeing I've now reached the nothing-to-lose stage, I'll give hot air a go and report the outcome
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AQUAR

Member
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Posts: 75
Reply with quote  #21 
Protect the heatsink fins (individually for getting a large surface area!) with thick aluminium foil and use a torch flame to heat the bugger up.

The silver copper solder alloy as you found out has a much higher melting point and so a small gas torch will heat the BGA/heatsink up much better and more controlled than a hot air heat gun (unless it too is a small and has very hot air!).

The Aluminium foils protects the heatsink by warning you to move on when it starts to melt.

Make certain the board is level and make certain nothing touches the heatsink whilst hot. 
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pfrcom

Junior Member
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Posts: 9
Reply with quote  #22 
I'd better post an update

I'd decided, about the time of post #18, to buy a replacement board from fixmydata

And after paying for it, thought "I can't stand the prospect of pulling this damn thing apart another couple of times"

So I held my horses until board arrived last Tuesday

Assembled it into machine, and reception [thumb]

Decided to give it a couple of days, to be sure, to be sure

It's now Friday, a couple of programs have recorded OK, and everything's still OK [biggrin]

So now I have a TRF-7160, seeing that's the firmware preloaded on replacement board

My thanks to everyone who participated in this thread, especially James for fixmydata suggestion, AQUAR for advice about BGA connections, and last but not least IanL-S for the forum

The original board's now tucked away - maybe one day I'll work up enough enthusiasm to have a go at it
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IanL-S

Moderator
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Posts: 605
Reply with quote  #23 
Excellent that you now have a properly working Toppro TPR-5000 with the 7160 firmware. 

Ian
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