[TechAssist] Reoair Tip - Sony KV36XBR450/DX-1A chassis
- From: "Glenn Larkman" <mail@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 3 Dec 2003 20:56:06 -0800
Applicable to the following chassis DX-1A used in many XBR 400/450 and
KV32/36HS20 Wega sets.
Symptom - Shutdown after 10 seconds with no picture displayed, sound
OK.
HV rises to normal. If G2 is increased a collapsed
vertical deflection
of reduced width is observed for a short time.
Looks like bad vertical O/P.
Solution - No Set 5V from regulator IC6007 due to a short measured
across 5V
output and ground from regulator.(located on main
A board)
Traced short to heat damaged FL3505 (
1-233-512-21 - 37uH inductor)
located on BC Pcb. This is a small sub daughter
board located on the B
board, connector CN3500, which then plugs into
the main A board.
Note - This was a little difficult to trace initially as a
low ohm reading of less than
20 ohms is normal when measuring the set 5V rail
to ground on the B board
when removed from the set. Makes you look at the
B board for the short.
The BC board is easy to remove without
dismantling everything if you know
to check it first which I now do.
Hope this saves someone some time in future on this relatively common
chassis. This fault temps
you into thinking you have a problem in the deflection stage rather than on
the signal sub board.
Glenn Larkman
Audiotech
256 Nth Hwy 101
ENCINITAS CA 92024
760 944 9048
FAX 944 0345
mail to"mail@xxxxxxxxxxxxx"
"www.audiotech.net"
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