CTX PL9 Blowing HOT

From: Kirk S. (crayzkirk_at_yahoo.com)
Date: 10/14/04 

Date: Thu, 14 Oct 2004 18:37:12 GMT

Hi,

Hope someone can help me. Got a CTX PL9 monitor just quit working. Power
LED comes on ok and all voltages are good at SMPS. The HOT (Toshiba
2SC5411) was fused and during my probing, I killed the FS3KM-18A MOSFET on
the flyback. Power supply was not coming up after I shorted it. I replaced
both and still had no Horizontal at the yoke. Found fusible 10 Ohm 1 watt
resistor (R341) open and replaced. Now the HOT is fused again and R341 is
open. Basically, I think I'm at where I was when I started only about $12
poorer and a little wiser.

I supposedly have the manual yet it is for a 1995UE and nothing matches at
all. No schematics for the main board at all.

Any ideas? I don't want to keep blowing HOTs; they aren't cheap. The
deflection is controlled by a TDA4857PS and the voltages are within the
range on the manual. I was also getting 0.4 vdc at the base of the HOT
before it fused.

Kirk S.

Relevant Pages

  • Re: Power issue follow-up question: UPS?
    ... But if we look at what happens when there is a power outage / power flicker ... charts for voltages that are ... Same charts also define high voltages that 120 volt electronics must ... How do we limit those spikes so that internal appliance protection is ...
    (alt.guitar.bass)
  • Re: Unstable A7N8X-DLX 2.0 system, Power Supply was culprit
    ... I began to suspect my vid card, vid card drivers or some other ... quite surprised to see Speedfan's graph of the output voltages. ... 5v rail was down to about 4.65-4.70v at startup, ... I've measured the power on my A7N8X-E Deluxe, with a clamp-on DC ammeter, ...
    (alt.comp.periphs.mainboard.asus)
  • Re: 3 blown Power supplys in 6 months.
    ... These undersized power supplies are why the 3.5 digit ... simultaneously and measure those voltages again. ... Many PSU makers actually lie ... > about what load their product will support. ...
    (microsoft.public.windowsxp.hardware)
  • Re: compound variable power supplies--possible?
    ... others put + on the center pin. ... pin/socket, funny looking pin/socket, yellow pin/socket, etc.) ... the power supply is generating both +12 and -12 volts - ... It doesn't make much sense to talk of DC peak voltages; ...
    (sci.electronics.repair)
  • Re: Unstable A7N8X-DLX 2.0 system, Power Supply was culprit
    ... I began to suspect my vid card, vid card drivers or some other ... quite surprised to see Speedfan's graph of the output voltages. ... 5v rail was down to about 4.65-4.70v at startup, ... is because the processor draws power from it. ...
    (alt.comp.periphs.mainboard.asus)