[TechAssist] Re: Emerson VT-0950N TV/VCR no vertical defl
- From: MYERSVCR@xxxxxxx
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 29 Sep 2003 22:08:46 EDT
Thanks for everyone's help. there is no 12V to pin 1 of LA7835 VCC1. Nearby
fusible resistor is ok. I wasn't even looking for this voltage I was only
looking for 25V but now i notice related 12V voltages missing everywhere. IC202
(TO-220 with snap on heat sink has 17.5 volts in nothing out. Pin 2 is gnd. No
diode or resistance measurements between the input and output. L7-M08 or ECG
964 Don't have a print but I think I'll try a new IC
Craig
n a message dated 9/29/03 9:49:23 AM Eastern Daylight Time,
peggs@xxxxxxxxxxxxx writes:
<< May be a B+ missing to the Jungle IC's Vertical Osc./Drive circuuitry.
I seem to remember these having solder problems on the TO220 regulators.
They are heat sink mounted
Peggs
At 08:17 PM 9/28/03, MYERSVCR@xxxxxxx wrote:
>Pulling my hair out on this one.
>25V present
>vert input present
>no vert out on LA7835
>replaced R467 which was bad then
>replaced LA7835 3 times
>resoldered everywhere including flyback related circuitry
>ESR'd all caps and replaced 7 in vert sect which were actually good.
>cannot find any resistors, diodes, caps etc that are bad. what am i missing?
>
>
>Craig Myers
>Myers Electronics
>610 Salem Ave
>York, Pa 17404 >>
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