[TechAssist] Re: 7p6033w phillips ptv 775 projectiuon tv hot repeat failure
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 13 Apr 2005 12:10:17 -0400
This post was for a PTV750. Might be similar chassis: read on:
Perhaps this?
Symptom: Repeat shorting of Q906 and opening of R934. Q906 is the High
Voltage output transistor and R934 is in series with Q906 (both on the
Signal/Deflection module).
CAUSE: In several cases, the cause has been a shorted blue CRT. Often the
faceplate of the CRT is cracked at one of the mounting ears, which
drastically reduces the vacuum inside the CRT leading to HV short.
SOLUTION: Check for a cracked blue CRT if Q906 is found shorted on the
Signal/Deflection module before replacing Q906 or installing a new
Signal/Deflection module. Replace the CRT if it is cracked. Remember to
replace R934 if Q906 is shorted. Note: Fluid leaked onto the Combo block can
also cause Q906 to short. Also, if the second anode lead hole in the anode
cap of any of the 3 CRT's is not filled with RTV, the high voltage can arc
out of the unsealed hole and blow Q906.
or this?
Symptom: Dead Set; Q802 and/or Q906 shorted.
Cause: High Voltage Arc from the CRT Anode Caps
Solution: Replace Transistors Q802 and/or Q906. Inspect the CRT High
Voltage Anode Caps for RTV voids. Place a bead of RTV (RTV part number
483531057158) around the edge of the CRT High Voltage Anode Caps.
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 -----
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
pete wrote:
>Hi guys
>I have a phillips projection shorts out q906 transistor I put in another
>works for 1 day then It goes out again. The only thing that I could tell you
>is that Its not a temperature issue. I checked b+ 130volts. Has anybody seen
>this one before? I also checked the blue crt looks ok not cracked. any help
>will be greatly appreciated.
>
>thank you
>Pete
>Perdomo Tv Inc Since 1972
>Miami.Fl
>-----------------------------------------------------------------------------
>This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
>Lost Password: http://www.tech-assist.org and select "Login Problems?".
>Email Archives: //www.freelists.org/archives/techassist/
>
>
>
>
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
