[TechAssist] Re: Fw: RCA PTK195 lightbox dead at wits end-HELP!!!
- From: "Gerald Gill" <gillcoelectronic@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 8 Dec 2005 16:41:18 -0500
Charles,
Take the board out and wash it down. There could be traces left you
can't see. Did you hook up the chipper checker yet? Any green corrosion?
Just a suggestion, whenever I get stumped I set the item aside and try
the next morning (its amazing what a good night sleep will do).
Sometimes the best of us will hit a "mental block" and it's always best
to move on and try again later.
Good Luck
Gerald Gill
Gillco Electronics Inc
113 King St East
Bowmanville, Ont.
Canada
(905)623-9312
-----Original Message-----
From: techassist-bounce@xxxxxxxxxxxxx
[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of repair11
Sent: December 8, 2005 4:29 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Fw: RCA PTK195 lightbox dead at wits end-HELP!!!
RCA PTK 195
I have already spent entirely too much time on this, but I am giving it
one
last shot.
I pulled lightbox because of miniscule amount of fluid around
micro,dead
set. I removed micro, eeprom, and cc connector and cleaned board, there
was
no fluid however ,under any of components. Micro has Vdd and clock, but
pin
19 will not go high which I discovered is what turns U14701 dual reg on,
to
among other things fire up jungle. Pin 23 and 24 which are supposed to
be
high (5v) are low until you lift micro pins, but can find no short, have
checked all other scan lines, also KD1 pin of micro is supposed to be
2.5v,but is 0 at pin and pad with micro pin lifted or in place. pin4
which
is I squared C run data line remained low until I lift R137 which feeds
a
multitude of data lines, after some isolating, I found an outgoing data
line
marked DATAra is lifted 5v comes back, I cannot however find where this
goes.I have replaced EEPROM, REG U14701,and MICRO, I have no ideas
left,
any help would be greatly appreciated.
Charles Betzler
Best Electronics
repair11@xxxxxxx
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