Author Topic: stumped on a Turbo Express repair (pics inside)  (Read 762 times)

schweaty

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Re: stumped on a Turbo Express repair (pics inside)
« Reply #30 on: May 12, 2014, 05:24:49 AM »
thanks, guys.  i will check all the voltages again.  the first time i checked, I think I used a common ground for the neg lead. 

the screen was checked on a good TE and it worked perfectly, so now its just a matter of finding the gremlin. 

If any of you guys could give me a path on the pcb to trace from pin2 that you are aware of, i would also appreciate it.

thesteve

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Re: stumped on a Turbo Express repair (pics inside)
« Reply #31 on: May 12, 2014, 05:39:42 AM »
that board can be a pain to trace as its a bizarre multilayer board
the board is double sided, than insulation painted, than another copper layer on top of that.
if i had one apart i would trace it, but ATM i dont

schweaty

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Re: stumped on a Turbo Express repair (pics inside)
« Reply #32 on: May 12, 2014, 06:45:57 AM »
just rechecked every cap.  everything seems normal except the 10uF16V.  it only showed 3.9V.  and CC703 (100uF6V) only had 2.2V.  no idea what those caps do.


thesteve

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Re: stumped on a Turbo Express repair (pics inside)
« Reply #33 on: May 12, 2014, 07:00:01 AM »
vref and video drive filter
the voltages look good
check the resistance to ground good and bad (no power) of pin2