[TechAssist] Re: Toshiba MW24FN1R TV/vcr.dvd combo.dead blown F1701
- From: "Jerome Silverman" <greentron@xxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 2 Oct 2004 21:07:32 -0400
Recently repaired two of those. One had a lot of damaged parts in the power
supply and after replacing those I could find, the SMPS started working, but
with full output and it popped a filter cap in the deflection circuit and
shorted a 33 volt protective zener in the deflection circuit. Turned out
that a tiny cylindrical 470 ohm resistor on the bottom side of the power
section near the optoisolator was open.
Second one came in with SMPS output too high, but it did not damage the cap
or zener. The same resistor was open and the opto was defective. Nothing
else.
Jerry Silverman
Greentron Inc
4 Newland Ave Greenville SC 29609
Fax/Phone 864 232 3889
greentron@xxxxxxx
----- Original Message -----
From: "Ron Miller d.b.a. Country TV" <rlmbkm@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, October 02, 2004 5:58 PM
Subject: [TechAssist] Toshiba MW24FN1R TV/vcr.dvd combo.dead blown F1701
> No TAC #. 24in flatscreen VCR/DVD combo.
> Unit came in dead missing F1701 (ac fuse 6.3amp).Checked diodes and simis
> in power supply sec and pri. sides replaced fuse plugged unit into AC
> varact (spelling) put DC meter on C of horiz output ixter.Raised voltage
> quickly to about 40vac. the voltage reading on dc meter went to 250vdc
> without blowing fuse and PS makes a singing noise.
> No regulation need tips or print/scan pdf of power supply section, no
> shorted or open parts that I can find.TIA.
> Country TV
> Ron Miller
> Inez, TX. 77968
>
>
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