[TechAssist] Fwd: Re: Sony KV32XBR45 CRT?
- From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 01 Mar 2003 22:33:02 +0000
Rejuving the CRT Got it going again. I used a SYT 84-1/A CRT
Tester/Rejuvinator on the low recovery setting. The Green cathode was
showing minimmal emmison the others were poor so rejuved the green 2x and
the others once. That got a good picture,the set to come on right away and
it not to cut off again when the channel was changed.
Peter Oliver
Tucson Radio TV
From: "D Panday" <dpanday@xxxxxxxxxxx>
To: oliver_peter1@xxxxxxxxxxx
Subject: Re: [TechAssist] Sony KV32XBR45 CRT?
Date: Sat, 22 Feb 2003 22:14:07 -0500
Peter,
I am not at the shop to check the schematic. However,I
do two procedure:-
a. I will rejuvenate the crt, works' most of the time.
I explain to the customer and charge a reasonable price.
b. Sony had changed the heater supply sometime ago.
If you have one heater pin on the crt socket goes to ground.
But on the actual cct pcb there are an option to put-in a capacitor with a
resistor going to the screen supply or 200 V supply( I am not sure on which
supply), this is indirect heating.
Whenever, indirect heat is used, you get less problem either for arcing to
ground or low cathode current draw, hence IK will not sense a problem.
You can check older models of Sony unit and you will find what I am telling
you (KV27TS27).
There is no way you can change the setup for IK. The feedback goes into
the Jungle IC which switches on the RGB signals.
If you had the internal operation of the the Jungle IC, then maybe you could
try a modification.
If IK setup is change to compensate for operation, your crt RGB outputs
color will not be right, customer will say the color is not right.
I worked on many of the XBR unit, I either change the heater cct if there is
the option or rejuvenate the crt with NO Warranty at reasonable cost to the
customer.Sometime the rejuvenating of the crt last for 3 months or 3 years,
never know!
Resistor usually be 100k 1/2W and capacito 1.6KV 471P.
Good luck.
Panday
From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
Reply-To: techassist@xxxxxxxxxxxxx
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Sony KV32XBR45 CRT?
Date: Sat, 22 Feb 2003 21:25:32 +0000
Sony KV32XBR45
MFD 1996
No picture LED blinks 1 ea sec continious sound ok, Picture will come on
after 2 to 8 hours. Saw TV at customers home picture quality= poor-Pinkish
then when turned off it goes back to blinking LED after imediate turning on
again. Thinking it is a High degree of probabblity the CRT is bad and that
the buss is Showing IK fault.
Two Questions:
1. Has anyone run into anything other than the CRT that will cause this
symptom in these XBR's. (ie screen resistors like the infamous R701 in the S
series)
2. If CRT is there a way to bypass/rebias the IK circuit to allow function
and the menu rebias of the colors ie. Would a CRT brighter work? reducing
the value of the screen resistor to allow more volatge, Grounding and
reconnecting mods ... I know upping the screen can help temporaily in some
cases but any longer term solution. (workarounds for bad CRT on micro biased
systems)
Peter Oliver
Tucson Radio TV
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