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41" Sony tv model:KP-41EXR96 chassis:SCC-F23C-A

41" Sony projection tv model:KP-41EXR96,chassis:SCC-F23C-A,chassis:AP,year:Oct 1993,turns on for 1 second then constant standby blinking LED until I press the power button again.I disconnected D2 connector (8 pin located near both STK4278L's) on the D board (convergence board located behind front speaker grills) and the tv came on with sound but only 3 lines going from left to right (red,green & blue).Also disconnecting D-5 connector allows tv to stay on with audio.

I noticed some other repair shop had resoldered both convergence IC's: IC1704 & IC1705=STK4278L=NTE7140 (which replaces STK4278) but both old original 3 amp fuses are still fine.I noticed that two of the pins of one of the STK4278L's were touching each other so I seperated them and still tv shuts down with D2 connector plugged in.

So I replaced IC1704 & IC1705 with exact generics and still not staying on.I don't usually repair projection tv's and never do service calls but this unit is light and the customer dropped it off at my apartment.I am on slow dial up internet so cannot download or view the service manuals which are usually in PDF:

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-AP

so if someone could download the schematic of the convergence board ONLY dealing with D2 connector area I would really appreciate it and email it to me at the below address.

Does anyone have any common repair tips for me too?.

Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova scotia Canada

Reply to
sidneybek
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I can send it to you if you want. It's around 1 MB for that page at full resolution. Andy Cuffe

snipped-for-privacy@gmail.com

Reply to
Andy Cuffe

Andy thanks alot for the offer but someone last night sent me the 6 pages required,thanks again.For being helpful you can download tons of service manuals & more here:

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Reply to
sidneybek

I found that something is shorting out the output of IC905=7915A=-12v reg (on D board,front convergence board),I unsoldered the parts near it including the vertical output IC and still the -12v is restored when D2=connector (green CRT plug on D board)is unplugged I cannot isolate the shorted component,it must be between D2 connector and IC1704 & IC1705=STK4278L=convergence IC's.

Anyone have any common repair tips?.Thanks alot.

Sidney Dartmouth,Nova Scotia Canada

Reply to
sidneybek

Update:

The tv below came from another repair shop where a "bonehead" tech switched two of the wires from D2=going to green crt connector with some of the ones going to blue hence the -15v was going to some of the yoke coils then to ground causing the shorted output condition to -15v regulator (IC906).

Now I have a constant blinking standby LED light unless I increase the red,green & blue screen pots of the screen/focus block assembly but the picture is weak with excessive round red,greeen & blue retrace lines.

Anyway to improve picture quality like IK blanking bypass? or an easy home made crt resorter?,also the links below I don't believe would apply to Sony projos am I correct?.

10 Sony IK circuit bypass sites:

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Sidney E-mail:sidneybek(at)yahoo.com Dartmouth,Nova scotia Canada

Reply to
sidneybek

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