[TechAssist] Re: 25f800 brite picture then shutdown (FIXED)
- From: Phil Bader <tjanphyl@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 19 Feb 2004 17:36:15 -0500
The first time I had this symptom I called Philips tech assist and was told of
the open
10 ohm resistor and to change the IC on the CRT board. I did then, but
afterward, all
others I only do the resistor, if the set gives a good picture.
I think they are underated.But still, an IC can go bad...
Phil Bader
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
Jim Bailey wrote:
> Peggs,
> I beleive the resistor opened because the wattage was undersized.
> Being the
> IC had failed probably causing excess current and eventually opening the
> resistor.The resistor was a 1/3 watt, and was replaced with a 1/2 watt. If
> you look at the internal diagram of the IC you will see that there is a
> voltage divider from the output to the input. This resistance can be
> measured. Our IC measured infinity from the input to the output for each
> color.Measuring from pin 1 to pin 9 should be around 3.2meg. The same for
> the other two color input to outputs. What made us look at this IC was that
> the voltage on pin 1,2,&3 was -19.? volts instead of 2.5 volts per the
> diagram.
>
> P.S I replaced the 10 Ohm resistor first and still had a shut down problem.
> Then took voltage measurments on chip inputs.
>
> MODEL: 25TR19C211
> CHASSIS: 25F800
> PHILIPS/MAGNAVOX
>
> Jim Bailey
> Bailey's TV Sales & Service
> Buckhannon, WV 26201
> baileystv@xxxxxxxxxxxx
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx]On Behalf Of peggs
> Sent: Thursday, February 19, 2004 3:50 PM
> To: techassist@xxxxxxxxxxxxx; TechAssist
> Subject: [TechAssist] Re: 25f800 brite picture then shutdown (FIXED)
>
> The 10 ohm resistor is a common problem with the symptom you had.
> I've never had to replace the chip.
> I don't understand what you mean about checking the chip.
> I would think the Input and Output pins 'should' check Open.
> Am I wrong ???
> Was the chip eating the resistor ???
>
> Peggs
>
> At 10:24 AM 2/19/04, Jim Bailey wrote:
> >Replace Video output Ic TDA6107Q and 10 Ohm Resistor 1/2 Watt
> >The opp amp gain resistors in chip (TDA6107Q)were open
> >checked from input of chip to output and they were open.
> >
> >Jim Bailey
> >Bailey's TV Sales & Service
> >Buckhannon, WV 26201
> >baileystv@xxxxxxxxxxxx
> >
> >
> >
> >
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