[TechAssist] Re: Phillips 47TP60 Chassis#PTV630-No video,Q906/R934 fail immediately
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 19 Nov 2003 07:34:50 -0500
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.
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: "Mike Jensen" <soundpromikej@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, November 18, 2003 7:36 PM
Subject: [TechAssist] Phillips 47TP60 Chassis#PTV630-No video,Q906/R934 fail
immediately
> We have a Phillips 47TP60/chassis #PTV630 that has no video. Q906/R934
fail on power up. We have inspected for cracks in the CRT's but have found
none. Where exactly does the CRT usually crack? Any other information as to
function of Q906/R934 would be helpful as we are working without a
schematic. Any other tips/schematic/info would be greatly appreciated.
> TIA.
> Mike Jensen
> Sound Pro
> Rapid City, SD
> Fax: 605-348-2252
> soundpromikej@xxxxxxxxxxx
> soundproservice@xxxxxxxxxxxx
>
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