[TechAssist] RCA TV model F32632SB chas. CTC187CN3 HOT runs hot
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 16 Dec 2003 17:45:19 -0500
This 32" CTC187CN3 came in with HOT shorted. I replaced with OEM BUH517
and noticed the HOT heatsink was running at 59 deg. C. (approx. 138 F),
measured directly on top of the transistor on the heatsink- which I
believe to be too hot. I remember having a couple of these sets that
were running cooler than that, maybe 45 deg. C.
I tried another OEM BUH517 - no help
Also replaced the following:
-C4306 .047 250V
-hor. driver transformer -with new one
-R4402, 22 ohm
-R4305 4.7K 3W
-CR4402
-CR4403
-CR4106
-C4403 0.55uF
-C4707 .041 400V
-C4409, 47 uF 35V
-C4402 .0157 uF
I measure 139.2 V dc on cathode of CR4106 (B+)
HOT collector waveform is 1100V p-p no distortion noticed
waveform at base of HOT is 15V p-p and looks ok (manual calls for 12V
p-p but my scope may be acting up a bit)
Thanks for any help.
--
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
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