[TechAssist] Re: RCA TV TX826TB, need schematic and waveform diagrams
- From: "Technotronic Dimensions" <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Thu, 12 Feb 2004 11:46:58 -0500
I think this is the 13 Inch model Right?
I remember doing an RCA Model E13154, probably the same Chassis? - that
used the S2000AF, and it was recommended to replace a Cap nearby the
Flyback, which I did even though it checked ok. It was CP08 = 100mfd / 35V.
I had that Pulsating effect , sounds like yours. Turns out the Foil Traces
under the Flyback were butchered, but repaired ok by a previous Shop. There
was one they missed though, very hard to see as it was a very mild Fracture,
but when I resoldered that, the pulsating on power up was gone - Set wes
Fine.
Steve Hearns
Technotronic Dimensions, NY [USA]
WWW.TECHNOTRONIC-DIMENSIONS.COM
1-877-817-9885 (Voice / Fax Toll Free - US Only)
----- Original Message -----
From: "Gary McCartney" <gary@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Thursday, February 12, 2004 9:40 AM
Subject: [TechAssist] RCA TV TX826TB, need schematic and waveform diagrams
I have 2 of these sets. The one I replaced the HOT with a S2000AF
because that was the number of the original removed, plus CP08, CP68,
DP02 and TP15 (used a 2SD1138 with leads bent to fit- I didn't have RCA
original or ECG31 in stock), also soldered around the board. Fired set
up on variac at 95Vac and it comes on but pulses really fast, like about
4 times a second. Is my TP15 the problem or do I have to fire it up at
120V, or do I still have a component problem? I haven't worked on this
chassis type before.
The other set I replaced the same components plus RP28 (2.7, 5W) and I
used a 2SD1886 for the HOT (specs match the original S2000N removed) and
again, a 2SD1138 for TP15. This set fires up at 95Vac and runs steady
but the HOT waveform has an extra step in it on the falling edge of the
pulse, about half way down which doesn't look normal compared to most
HOT waveforms in other chassis. Is this normal for the TX826? If so I'll
test run it to see if TP15 and the HOT hold up. So far I've only left
the set on for about 10 seconds.
Yes I know there are techs who will say "just forget about these." Well,
I've been thinking of giving up on the whole shop.
THanks for any help.
--
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
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