[TechAssist] Re: Philips 25TR12 C102 chassis 25P606-OOAA
- From: "Larry E." <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 03 Aug 2002 17:04:13 -0400
Walter, I pulled & Ohmed R406 & R402 because I only have 2.3v on
Collector of Q404, they
both check good so something further along is pulling my supply down,
only have 1.2v on Q410`s
emitter, 1.8 on base and 2.3 on collector. No 5 v line= no relay click,
I`ll keep looking,
thank you for your time and expertise,
Larry E.
walter wood wrote:
>Larry, the regulated power supply on these chassis
>is very close.
>The scan derived is different as is the micro.
>The standby 5v is on the emitter of Q410 through a
>6.8 ohm resistor R417.
>It then branches into 3 more 5 volt sources.
>L417
>L418
>and through R305 and L315.
>Q410 base looks like it is fed from the raw 156
>volt b+ through F401,R406,R402,D415,D416 and R416.
>The collector of Q410 should have aprox. 6.6vdc in
>stand by.The emitter 5vdc and Base about 6.
>IC 345 on the P6 is fed 5v on pins
>17,13,18,36,40,16,48,34,33,32,30,31,and 44 through
>the remote receiver.
>Pin 17 also goes to the keyboard, and a stuck, or
>windex'ed button would kill the 5v.
>HTH
>Walter
>--- "Larry E." <videotech@xxxxxxxxxxxx> wrote:
>
>>Hi guys, got a 25P6 chassis totally dead, No
>>relay click, nothing. I
>>haven`t got the print for a
>>P6, I`m using a Y1/Y4 because the power supply is
>>close. I have standby
>>B+ out of the regulator IC
>> to collector of Q403 the 9volt standby switch
>>but emitter is 2 volts
>>instead of 6.8, if the P6
>>chassis works the same way as the Y1/Y4 this
>>means I don`t have my 5
>>volt line for the micro.
>>The micros are both marked IC345 but they are
>>different, any ideas??
>>
>>Larry Eastman
>>American TV & Electronics
>>Crystal River Fl.
>>
>>------------------------------------------
>>To REMOVE your email address, click here:
>> http://www.tech-assist.org/unsubb.html
>>To CHANGE your email address, click here:
>> http://www.tech-assist.org/change.html
>>------------------------------------------
>>***NEW*** Tips Added Instantly!!!***
>>Submit Repair Tips here:
>>http://www.tech-assist.org/secure/tip/
>>
>
>
>=====
>Walter Wood
>Future Tech Home Center
>2786 Hwy. 43 N.
>Lawrenceburg Tn. 38464
>931-829-3337
>Fax 931-829-4044
>mailto:wwood_38478@xxxxxxxxx
>
>__________________________________________________
>Do You Yahoo!?
>Yahoo! Health - Feel better, live better
>http://health.yahoo.com
>------------------------------------------
>To REMOVE your email address, click here:
> http://www.tech-assist.org/unsubb.html
>To CHANGE your email address, click here:
> http://www.tech-assist.org/change.html
>------------------------------------------
>***NEW*** Tips Added Instantly!!!***
>Submit Repair Tips here:
>http://www.tech-assist.org/secure/tip/
>
>
------------------------------------------
To REMOVE your email address, click here:
http://www.tech-assist.org/unsubb.html
To CHANGE your email address, click here:
http://www.tech-assist.org/change.html
------------------------------------------
***NEW*** Tips Added Instantly!!!***
Submit Repair Tips here:
http://www.tech-assist.org/secure/tip/
Other related posts:
