[TechAssist] [ FIXED ] Philips TS2757 chassis 27F8 Micro-processor is confused, or (crazy).
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: "TechAssist" <techassist@xxxxxxxxxxxxx>
- Date: Fri, 6 May 2005 08:37:27 -0600
Bill was right about the Micro-p causing the problems with this set.
I replaced IC # 7600 (Micro-P.) with part # 935267096112, and it is up and
running again.
The Eprom didn't even need to be replaced, or reprogramed.
Thanks for all the help & suggestions that were offered,
LLW
LeRoy Westlund
Westlund TV & Electronics
97 North Main " I forgot,..to remember,..
Centerfield, UT 84622-0087 to forget "
Ph./Fax 435-528-3822
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: William Rayburn <premtech@xxxxxxxxxxxxxx>
To: LeRoy Westlund <llw@xxxxxxxxxx>
Date: Wednesday, March 09, 2005 12:13 AM
Subject: Re: [TechAssist] Philips TS2757 chassis 27F8 Micro-processor is
confused, or (crazy).
>That's micro LeRoy I'd bet money on it.. But also check the 4.7ohm
resistor at 3488 for
>stress or open condition. I would have a little concern that everything
but shutdown by
>itself would be micro and you may have a secondary problem there. But the
rest is micro.
>The corrected part number for that is 935267096112.
>HTH
>Bill
>
>William H. Rayburn, CET
>NESDA Member
>Premium Technologies
>PO Box 442
>Long Beach, Wa. 98631
>(360) 642-4993
>email: premtech@xxxxxxxxxxxxxx
>----- Original Message -----
>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
>To: "TechAssist" <techassist@xxxxxxxxxxxxx>
>Sent: Tuesday, March 08, 2005 3:28 PM
>Subject: [TechAssist] Philips TS2757 chassis 27F8 Micro-processor is
confused, or (crazy).
>
>
>Hi members,
>This Philips model TS2757, chassis 27F8, has a confused
>micro-processor,...but,...it's not as confused as me.
>
>Symptom: When I plug in the power, the set will turn on by it's self.
>Then it shows a good picture, and sound, but will sometimes shut back off
by
>it's self.
>When it is on,, you can't turn it off with the power switch. If you try to
>turn the volume down, it will shut off. It will not change channals from
the
>front panel controls, but, it will change up and down with the remote.
Also,
>you can turn the volume up and down with the remote, but, you never know
>when the set will shut off. I know this sounds crazy to you guys,
>but,....how else can I explain it ?
>
>I have removed all 5 of the front panel control switches, and tested the
set
>with the remote only, but,...it still acts the same way. I removed the
>EPROM, and it still acts the same, except for a short vertical deflection,
>which is normal.
>
>I have tested several e-caps in the power supply, cause all my voltages
seem
>a little too low. Here are my voltage readings:
>
>+ 130 volts off of cap # 2551, reads 125 in standby, and 123.3 in Run.
>Off of cap # 2561, I read 9.0 in standby, and 11.0 in Run.
>Off of cap # 2571, I read 7.0 in standby, and 8.2 in Run.
>Across cap # 2508, I read 154 in standby, and 150 in Run.
>
>I have checked for bad connections on Vert. output IC, and many other
>places, but found none. Picture is normal when it works, so Vertical, and
>Eprom are OK.
>Sure acts like a bad Micro-p. to me,....but,...I hate to order a part like
>that, without asking you guys for a second opinion. (I am working without a
>manual, as usual).
>
>Any suggestions are appreciated,
>LLW
>
>LeRoy Westlund
>Westlund TV & Electronics
>97 North Main " I forgot,..to remember,..
>Centerfield, UT 84622-0087 to forget "
>Ph./Fax 435-528-3822
>mailto:LLW@xxxxxxxxxx
>
>
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