[TechAssist] Re: GE TV CTC177AA3 - 25GT503 - Dead - No SMPS startup
- From: Al Gutz <alg@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 06 Mar 2004 22:47:57 -0500
David
On the secondary of transformer there is a large diode which may be
shorted (not sure of the number without schemo) and a 10 or 20u 200V cap
I think C105. The cap goes bad and shorts the diode which in turn kills
the STK. The diode is mur480. The 1.5 meg is located between the stk and
the deguss thermistor
Al G
David Lessard wrote:
>
> When plugged in I don't hear the usual startup sound of the SMPS. SMPS
> appears to be dead. I've checked the following, R4001, CR4106, CR4704,
> R4702 and R4517. I believe the problem is the STK73-010 SMPS
> driver/regulator. Is there anyway of confirming this is the problem or
> do you guys just normally swap these without giving it a second guess.
> Does the standby power work off the SMPS because I can't measure +5volts
> anywhere?
>
> Thanks in advance,
>
> David Lessard
> Alexandria Electronics
> 50 Harrison Street
> Alexandria, Ontario
> K0C-1A0
>
> mr_fixit@xxxxxxxxxxxx
>
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