[TechAssist] Re: Philips TS2757 chassis 27F8 Micro-processorisconfused, or (crazy).
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 10 Mar 2005 11:55:50 -0700
OK, Jim.
Here is my voltage readings:
Pin # 39 = 2.97 in S.B. & 3.13 in run.
Pin # 43 = .07 in S.B. & .04 in run.
Pin # 44 = 2.97 in S.B. & 3.13 in run.
Transistor # 7603 (pins not marked, and NOT a SMD).
6.19 in S.B. & 7.9 in run.
3.5 in S.B. & 3.7 in run.
2.94 in S.B. & 3.15 in run.
Transistor # 7604 ( SMD):
E = 0 in S.B. & 0 in run.
B = .62 in S.B. & .63 in run.
C = .07 in S.B. & .03 in run.
If this don't tell us anything, then I'm just going to call the customer an
estimate for replacing the Micro-p., like Bill suggested to start
with,...and see if he will approve it.
Regards,
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: becyn <becyn@xxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Thursday, March 10, 2005 10:38 AM
Subject: [TechAssist] Re: Philips TS2757 chassis 27F8
Micro-processorisconfused, or (crazy).
> Pin label volts
>
> 39 vddc 3.3
>
> 43 reset 0
>
> 44 vddp 3.3
>
>also the reset circuit has 7603 and 7604 (smd?) transistors
>
>Jim McVey
>McVey Alltronix
>327 Broadway
>Newburgh N.Y. 12550
>
>"If it doesn't play...
>CALL MCVEY !!!!!!"
>Factory authorized
>service for over 20
>major brands.
>845 561 8383
>(Last of the Mohegans)
>
>LeRoy Westlund wrote:
>
>>Jim,
>>What's th "mux lines" ?
>>It could be leaky SMD caps, because I have 4.7 volts on both sides of most
>>of the control switches.
>>Again,... I'm working without a schematic, cause my browser is not good
>>enough to get into the download area of the TechAssist-B archives. I know
>>there are 3 manuals there from the index I have on my desk-top, for the
27F8
>>chassis. If someone could send it to me direct, it would help me
>>troubleshoot this set better.
>>
>>Thanks,
>>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: becyn <becyn@xxxxxxxxxx>
>>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>>Date: Thursday, March 10, 2005 9:19 AM
>>Subject: [TechAssist] Re: Philips TS2757 chassis 27F8 Micro-processoris
>>confused, or (crazy).
>>
>>
>>
>>
>>>LeRoy,
>>>
>>>If there was any corrosion on the switches and perhaps even if there
>>>
>>>
>>wasn't,
>>
>>
>>>clean the top and bottom of the PCb with alcohol. If it's the mux type,
>>>check that there
>>>is 5V on the mux lines. Sometimes the smd bypass caps are leaky.
>>>Also make sure the 5V is correct and without noise. Also chech the micro
>>>reset pin
>>>for the correct level.
>>>
>>>
>>>
>>>Jim McVey
>>>McVey Alltronix
>>>327 Broadway
>>>Newburgh N.Y. 12550
>>>
>>>"If it doesn't play...
>>>CALL MCVEY !!!!!!"
>>>Factory authorized
>>>service for over 20
>>>major brands.
>>>845 561 8383
>>>(Last of the Mohegans)
>>>
>>>LeRoy Westlund wrote:
>>>
>>>
>>>
>>>>How can that be, when I removed all 5 control buttons, and it still acts
>>>>
>>>>
>>the
>>
>>
>>>>same ?
>>>>That's the FIRST thing I checked.
>>>>
>>>>Regards,
>>>>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: pete <tvtech@xxxxxxxxxxxxx>
>>>>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>>>>Date: Wednesday, March 09, 2005 7:24 PM
>>>>Subject: [TechAssist] Re: Philips TS2757 chassis 27F8 Micro-processor is
>>>>confused, or (crazy).
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>>looks like you might have the windex syndrone with the front panel
>>>>>
>>>>>
>>buttons
>>
>>
>>>>>good luck
>>>>>Pete
>>>>>Perdomo Tv Inc Since 1972
>>>>>Miami.Fl
>>>>>----- Original Message -----
>>>>>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
>>>>>To: "TechAssist" <techassist@xxxxxxxxxxxxx>
>>>>>Sent: Tuesday, March 08, 2005 6:28 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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>>>>
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