[TechAssist] Re: Sanyo AVM-2595U - bad regulation.
- From: "Jerry" <geiting@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 28 Nov 2001 19:52:10 -0500
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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