[TechAssist] Re: RCA Mod#P46813BL, CH# PTK195AA-dead

  • From: Philip Bader <tjanphyl@xxxxxxxxxxxxxxx>
  • To: techassist@xxxxxxxxxxxxx
  • Date: Thu, 28 Aug 2003 13:16:19 -0400

On a hunch:
If it is dead, no clicks, but the eeprom has the +5V on it's Vcc, Go to
regulator IC U14701,(located at front of chassis) Check ohms on it's
+12.1V output pin# 6. If short, there is a short on that 12V run line.
Remove the underside tuner shield to access IC U17701 ufh/vhf/osc/mixer
(SMD). lift pin 8 Vcc. If short clears, replace shorted tuner IC U17701.
Common.
Phil Bader

Richard La Placa wrote:
> 
> Help???
>  When I unsolder pin 23 & pin 24 on micro.(U13101) I get real good clock & 
> data pulses coming out, but the DC voltages are low.The DC voltage on the 
> pads is 4.9 volts , but when I reconnect, I only get 1.6 volts on pin 
> 23(data) & 2.29volts on pin 24(clock). The micro seems to be holding the 
> voltage down.I don't have anything coming out of pin 19(run/stby).The micro 
> costs $49.00, and I am trying to make sure it is really bad before I get a 
> new one. I dont see many of projection sets here and won't need a spare micro 
> if this is still good.
> Any help greatly appreciated
> Richard La Placa
> Continental TV
> 312a Park Row
> Chestertown, Md.
> fax&phone-410-778-1113
> website: http://www.continentaltv.homestead.com/
> continentaltv@xxxxxxxxxxx
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-- 
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821      
email: tjanphyl@xxxxxxxxxxxxxxx
For Professional Technicians Only

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