[TechAssist] Re: mitsubishi model CS-20SX1 TV won't stay on FIXED
- From: "Jerry" <geiting@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 11 Oct 2005 23:15:14 -0400
Thanks to the many replies I received on this, especially to Gary McCartney
for the schematic, which helped me to understand the various tips posted
about this set. Fix turned out to be cleaning cap leakage on the PC board
from around Q505 and replacing C520. Apparently, C520 had leaked some to
the area of the pc board around Q505, causing it to conduct and shutting
down the set. The way it's set up, with a 390K pullup resistor to the base,
makes it very susceptible to easily being forward biased and shutting down
the set. I guess Mitsubishi didn't think about the problems with the leaky
caps they were using! Thanks to all of you again for your help.
Jerry Eiting geiting@xxxxxxxxxx
Christian's Electronic Service
Troy, Ohio
----- Original Message -----
From: "Jerry" <geiting@xxxxxxxxxx>
To: <repair@xxxxxxxxxxxxxxx>
Sent: Monday, October 03, 2005 7:43 PM
Subject: mitsubishi model CS-20SX1 TV won't stay on
| I'm looking for a schematic and/or tips on this Mitsubishi TV model
CS-20SX1
| 20" TV. This is an early 90's model set which the customer is willing to
| spend some money on to repair. Problem with the set is it shuts off a few
| seconds after turn on. You then have to remove and reapply AC power to
get
| it to come back on. After repeating this a number of times, it may
finally
| stay on and work fine. I've checked for the obvious things like power
| supply voltages, correct vertical and horizontal circuit operation, leaky
| front panel switches and remote receiver. Have also checked for bad caps,
| both leakage and ESR. So far nothing found. I don't want to have to buy
| literature for this oldie. Any help is appreciated.
|
|
| Jerry Eiting
| Christians Electronic Service
| Troy, Ohio
|
|
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