[TechAssist] Re: Panasonic cp36sx31e shutts down after 30 min.
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 6 Apr 2005 12:53:35 -0500
check crt pins and socket for tarnish, also abl circuit see below
Symptom: The unit will intermittently shutdown and must be unplugged before
it will turn on again.
Causes: . Faulty components in the ABL circuit cause increased beam current
to trigger shutdown circuit.
. Arcing at CRT connector and/or spark gap causes shutdown.
Remedy: . Troubleshoot ABL circuit and check components listed below. Check
C524 and R517.
. Clean CRT pins and/or replace CRT socket connector (part number TJSC01800)
Troubleshooting Tips
. Check the ABL circuit to confirm if it is the cause of the problem.
1. Apply a full white field or large window pattern with high white.
2. Lift Diode D837 to disable140V line short protect feedback circuit to MPU
SOS pin.
3. Short pin 3 of flyback T551 to ground. Observe any change in white level.
If there is no change in brightness the ABL circuit is faulty.
Check components: C524, R517, D509, D510, R514, R515, R516 ( and C525 on HX
series models)
If the white level increases, then ABL is OK. Troubleshoot other protection
circuits.
For HX series: check D837, D835, D841, D401, D409, D894, IC2505
For SX series: check D837, D835, D841, IC101, R246.
. Other causes for intermittent shutdown are arcing and/or oxidation of the
CRT connection pins.
Remove the CRT drive board and clean the CRT pins with a wire brush or steel
wool.
In addition, check the spark gap on the CRT socket. Remove the 2 focus wires
(orange and white cable) by pulling the tab,
then pull the 2 side clips from the socket cover and inspect the spark gaps.
If they appear abnormal, replace the CRT socket.
(Part number: TJSC01800).
hth
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Mehdi Tafaghodi" <mehdi@xxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, April 06, 2005 12:03 PM
Subject: [TechAssist] Panasonic cp36sx31e shutts down after 30 min.
> Hello Techs
> I need help on this panasonic tv model cp36sx31e . It works normal and
> after about 30 minutes static appears on screen then shutts down. I
> resoldered some bad connections on the board but it did not help.Any
> suggestions ?
>
> Mehdi
> Nova Service Center
> 7531 Lindburgh Dr.
> Gaithersburg, MD 20879
> 240-632-1717
> mehdi@xxxxxxxxxx
>
>
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