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Intersil CA3162E/CA3161E A/D BCD/7Segment problem Weller Soldering Station

Subject: Intersil CA3162E/CA3161E A/D BCD/7Segment problem

Hi I am trying to fix my Weller soldering station which has lost its temperature readout. This particular model has the Intersil CA3162E/CA3161E A/D and BCD/7Segment chips. When first turned on the display flashes "EEE" and then goes blank. I shotgunned the repair by replacing the filter caps in the power supply and though I had it fixed but it is back to same problem.

In reading the Intersil application notes for the A/D convertor I don't see a logical mode where EEE would be displayed

Does anyone have advice for troubleshooting this configuration?

--
Joe Leikhim K4SAT
"The RFI-EMI-GUY"©

"Treason doth never prosper: what's the reason?
For if it prosper, none dare call it treason."

"Follow The Money"  ;-P
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