[TechAssist] Re: Mitsubishi TV, Model CK31302, No video, has sound
- From: "Jeff Dougherty" <support@xxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 23 Nov 2002 11:34:46 -0500
1. CHECK BLANKING PULSE AT IC201 PIN 1. SHOULD BE 8-10VPP. IF LOW, SUSPECT OPEN
R585 (1.2 OHM 1.2W). LOCATED ON MAIN PCB AT FBT PIN 5.
1. NO MAIN VIDEO,THERE IS VIDEO IN PIP ON EXT1 AND EXT2:-CHECK FOR 1VPP OF
LUMINANCE ON PIN 1 OF IC7000, IF MISSING OR LOW CHECK THE VALUE OF C7001 (4.7UF
35V), LOCATED ON THE PIP-PCB.THIS CAP MAY LEAK ELECTROLYTE ONTO THE BOARD AND
OPENED A FEED THROUGH IN THE PATH BETWEEN C7001 POSITIVE LEAD AND THE EMITTER OF
Q7003 OR CAUSE INTERMITTENT COLOR. 2.NO MAIN OR PIP VIDEO, CHECK C7014, 47 UFD
16V
ON THE PIP PCB. PART # 181P502060 3. CHECK FOR 7.2V DC ON THE BASE OF Q7003,IF
LOW
OR MISSING.CHECK THE VALUE OF R7002 (150 OHM 1/10W).LOCATED ON THE PIP-PWB.
PT#103P401050
1. BLACK SCREEN NO OSD AND THE AUDIO IS O.K.AT TURN ON MONITOR PIN 29 OF IC701
FOR
0 VDC,IF THIS INCREASES.DISCONNECT PIN 29 AND MONITOR THE PIN FOR 0V,IF MORE
THAN
0V,REPLACE IC701.LOCATED ON THE MAIN-PCB 2. CHECK BLANKING PULSE AT IC201 PIN 1.
SHOULD BE 8-10VPP. IF LOW, SUSPECT OPEN R585 (1.2 OHM 1.2W). LOCATED ON MAIN PCB
AT FBT PIN 5.
Jeff
FAX 717-564-4952
Jeff Dougherty
Intrepid Video & Electronics Be careful of your thoughts.
501 Luther Rd They may become your words
Harrisburg, PA 17111 any moment.
717-909-8844
VCR tips, electronics info & general interest.
www.intrepid-video.com www.tech-repair.net
www.thetoolcaddy.com www.9-11-2001tragedy.com
***********************************************************************
----- Original Message -----
From: <gulftech@xxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, November 22, 2002 8:27 PM
Subject: [TechAssist] Mitsubishi TV, Model CK31302, No video, has sound
Customer said had vertical problems, but "A slap on the side would make
it work." Then it died.
Found bad connections on vertical output. Resoldered board. Set would
power up with sound, but black screen and no OSD. Changing input to
external gave blue screen, again w/ no OSD.
Found diode D582 shorted, R585 open, and R520 reading high ohms (35K, I
think). I couldn't cross D582; replaced with NTE585. Replaced R585 w/
1.2 ohm, 1/2 wt. R520 <appears to be> brown, brown, black, silver, red.
That would be 1.1 ohm. Replaced w/ 1.0 ohm, 1/2 watt.
Tech said set came on with video, but shut down. Pulled chassis.
Installed parts checked good. No blown fuses. I suspect he had a loose
connector somewhere, but would like some verification, please.
I have no service manual and Sams does not cover this model. Someone
with this manual, can you verify the parts I replaced and the circuit
they are in.
BTW, suspecting the PIP module, the module was bypassed (before the bad
components were found) with no change in the symptoms.
Thanks for any help on this one. I had wanted to get this fixed so the
customer could watch the Iron Bowl Game, (Alabama vs. Auburn) tomorrow
afternoon. Roll Tide!
TIA,
Ken Smith
Gulf Technical Services
3034 Gulf Breeze Parkway
Gulf Breeze, FL 32563
850-934-8324 (Voice) 850-932-0819 (Fax)
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