[TechAssist] Re: Philips 36" tv Model 36PT71\chasis 36H8
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 1 Oct 2003 14:14:43 -0400
It sounds like a defective small signal board (usually it is just a diode
that goes bad on it). See the following:
SYMPTOM: No color at turn on (or at second turn on after AC break).
This is more common with room temperatures below 70 F.
SYMPTOM: No turn on from standby, most often after standby overnight
and at room temperatures below 70 degrees F.
CURE: Both symptoms are cured by replacing zener diode 6031 with
Service Code 9322 131 13685, a 2.4 volt part or with 9340 548 42115,
also a 2.4 volt part. This part is on the Small Signal Board. The zener
is
on the side of the SSB facing the tuner, just above pin 5 of IC 7066.
The PWB is marked A and K. The end of the part with the bar is K.
Also the cure can be made by replacing the SSB. Care in alignment is
necessary
if the SSB is replaced.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "armando guerra" <birdie@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, October 01, 2003 1:22 PM
Subject: [TechAssist] Philips 36" tv Model 36PT71\chasis 36H8
> This set according to customer was playing fine until they hooked up a
> used direct tv receiver.After connecting the receiver (tru rf
> connector,not a\v jacks) and powering tv up,the pix pulled in from the
> sides,the color went bad and smoked a little.They turned it off right
> away,waited for 5 min and tried again.All is ok other than pix lacking
> vertical about 5in. at the bottom.They brought it in yesterday and I
> checked it out (no manual) and could not see any physical damage (burned
> parts).I had an extra vert.ic tda-8172and tried it but no difference.I
> checked low ohm resistors and diodes and they check ok.
> Does this ic use the -13v and +13v.I would like to know what res. and
> diodes feed both of this voltages.Maybe the eeprom went bad.Any tips and
> idea's will help. Thanks
> Mando
> Birdie's TV & Electronics
> Casa Grande,AZ
>
>
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