Hi,

Here is an update, but TV is not repaired yet:

Note: TV chassis is L03.1UAA and I have SM.

The vertical deflection system uses discreet components.
There is no vertical amplifier IC, which is common in all other TVs
I have worked on. I replaced "2463" 100/50 and "2446" 470/16.
Both measured a loss of capacitance, but it made no improvement.
"2465" 10/160 tested very good, however I replaced it, but it didn't
fix the problem.

I tested the two output transistors out of circuit (AOK). I tested other
transistors in circuit. Also tested various components in the vertical
deflection circuits. Note: I originally checked solder joints and soldered
several joints that seem to lack good solder bond.

I used a Yoke tester and checked both windings individually
after I separated the windings at a terminal. Both windings read
"good", but one winding had a higher reading than the other. I
repeated the test incase of a poor test lead(s) connection, but the results
were the same!

Scoping the two inputs to the vertical amp, the "+drive" signal doesn't
match "-drive" waveform, although it's "inverted". The +drive signal is
"abnormal".
Brad

On Thu, 23 Oct 2008 11:42:33 GMT, Brad wrote:

Hi,

I bought the service manual and found out that AN7225N is not the
vertical IC.

If I repair this TV (in my spare time), I will let everyone know what
part(s) caused this problem.

Brad

On Thu, 23 Oct 2008 11:42:33 GMT, Brad wrote:

Hi,

I have a Philips TV model 20PT6245/37 (mfg 05/05) in my
service shop with a loss of vertical deflection. I do not have SM.

For a moment after the TV is turned on, there is some vertical deflection,
but it collapsed into a single horizontal line in the middle.

I checked solder joints at the vertical IC, resoldered them anyway, but
this had no effect. Note: I soldered other joints too. Flexing and tapping
on mother board has no effect.

I couldn't find pin out info on the vertical IC AN7225N on the
web so I could make additional tests.

Thanks in advance, Brad

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