[TechAssist] Re: Sanyo AVM-2595U - bad regulation.
- From: "Jerry" <geiting@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 28 Nov 2001 21:13:51 -0500
The 2 resistors are in parallel with each other and before the regulator ic?
That is a bit unusual. Most sets have a resistor in parallel with the STR
ic. But the idea is to keep the STR from having to dissipate too much
power. I think the one cracked resistor is probably bad, breaking down
under load if it doesn't measure bad. The other possibility is that load on
the output of the STR is drawing too much current, but if the HOT is running
normally, there aren't many other options left...
----- Original Message -----
From: "Patrick Fugere" <p_fugere@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, November 28, 2001 8:40 PM
Subject: [TechAssist] Re: Sanyo AVM-2595U - bad regulation.
|
| There are two large 10-15watt resistors right before the STR. They mesure
| pretty much what they should 220ohms, but one has a crack the whole lenght
| and mesures 210 and the other 222. Before the resistors is my 150v and
after
| it goes down to ~105v.
|
| I guess this must be my problem?
|
|
| ----- Original Message -----
| From: "Jerry" <geiting@xxxxxxxxxx>
| To: <techassist@xxxxxxxxxxxxx>
| Sent: Wednesday, November 28, 2001 7:52 PM
| Subject: [TechAssist] Re: Sanyo AVM-2595U - bad regulation.
|
|
| >
| > The input to the STR is way too low (your right, it should be about +150
| > volts or so and has to be above about 135 for the STR to regulate). So
| the
| > problem apparently is in raw B+ supply. I don't have the diagram for
that
| > set, but usually there is just the bridge diodes, fusible resistor
and/or
| > fuse, main filter cap, etc. An open diode in the bridge could do this.
If
| > the HOT is not running hot, then it's probably not the problem. There
may
| > also be a resistor in the supply before the STR for current limiting
that
| > has gone up in value.
| > Jerry
| > Christian's Electronics Service
| >
| > ----- Original Message -----
| > From: "Patrick Fugere" <p_fugere@xxxxxxxxxxxx>
| > To: <techassist@xxxxxxxxxxxxx>
| > Sent: Wednesday, November 28, 2001 7:16 PM
| > Subject: [TechAssist] Re: Sanyo AVM-2595U - bad regulation.
| >
| >
| > |
| > | Voltage plays aroud 105v coming out of the STR. Same thing going in(
| isn't
| > | it suppose to be arround 150v?). B+ goes from 90v to 110v depending on
| the
| > | brightness of the image. The brighter the lower the voltage is.
| > | no irregular excess ripple noticed on scope. Mostly horizontal
movement,
| > | especially pin. The HOT is not abnormally hot. tested it for 20min on.
| > |
| > | U suspect power supply components? HOT?
| > |
| > | ----- Original Message -----
| > | From: "Jerry" <geiting@xxxxxxxxxx>
| > | To: <techassist@xxxxxxxxxxxxx>
| > | Sent: Wednesday, November 28, 2001 6:50 PM
| > | Subject: [TechAssist] Re: Sanyo AVM-2595U - bad regulation.
| > |
| > |
| > | >
| > | > How low is the regulated voltage? Is the raw B+ to the regulator OK?
| > | excess
| > | > ripple? If not check filter caps and power supply diodes. Is the
pix
| > | > getting smaller vert and horz or just horz? Is HOT running hot? The
| > d1879
| > | > and d1880 cross to different transistors so they may not be similar
| > enough
| > | > to sub correctly.
| > | >
| > | > Jerry
| > | > Christian's Electronics Service
| > | >
| > | > ----- Original Message -----
| > | > From: "Patrick Fugere" <p_fugere@xxxxxxxxxxxx>
| > | > To: <techassist@xxxxxxxxxxxxx>
| > | > Sent: Wednesday, November 28, 2001 6:24 PM
| > | > Subject: [TechAssist] Sanyo AVM-2595U - bad regulation.
| > | >
| > | >
| > | > |
| > | > | Hi,
| > | > |
| > | > | Sanyo AVM-2595U with bad regulation.
| > | > | Received the set dead. HOT was short so I replaced it. Now it goes
| on
| > | but
| > | > | very bad regulation. The brighter the screen gets the smaller and
| more
| > | > | distorted the image is.(squeezed pin).
| > | > | I replaced IC001 ( STR30130 ) and still the same . So I replaced
the
| > | > nearby
| > | > | cap C007 and no dice.
| > | > |
| > | > | What else could be causing this. The original HOT is D1879 but
I
| > | > replaced
| > | > | it with one I had in stock which has similar specs D1880. Could
this
| > be
| > | > it?
| > | > | I would doubt it but...
| > | > |
| > | > | Any help appreciated.
| > | > |
| > | > | Patrick Fugere
| > | > | F u j i s t i c s
| > | > | Montreal, Canada.
| > | > | p_fugere@xxxxxxxxxxxx
| > | > |
| > | > |
| > | > |
| > | > |
| > | > |
| > | > |
| > | > |
| > | > |
| > | > |
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