[TechAssist] Re: RCA model# 27R410T chassis ITC008 weak video
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Fri, 07 Oct 2005 14:18:17 -0700
not sure if this pertains to yours or not,but
from WinStips
Intermittent Sync
Rv001 (15k Surface Mount, Part # 256743), Cv006 (Part # 256858), And Cv007
(Part #
244072). All Of These Components Are Off Of Pin 17 Of Iv001. All Are Smd
Components, Held In By Excess Glue Which Is Conductive.
Video Input Loses Color, On Tuner Input Loses Horizontal Sync
Lock. Suspected Defective Signal Ic, Iv001, But Upon Replacement
Symptom Returned. Further Inspection, Found Cold Solder On Surface Mount
Component Cv006 Off Pin 17 Iv001. Further Inspection Found Cold Solder On
Three Additional Surface Mount Components: Rr012, Rr013, Rr061. Resolder
All Listed Components And Unit No Longer Breaking Down With Thermal
Changes To Ic, Iv001
Found That There Was No Voltage On Pin 49 Of Jungle Iv001. No Beam Current
Limit To Pin 49.
Found Open Rl002 Which Feeds The Voltage To The Beam Current Circuit.
Located Behide Flyback.
If You Look Off Pin 17 Of Iv001 (The H Vco 1600fh Area), You Will Find The
Following 3 Surface Mount Components:
Rv001 (Part# 256743) (Res Cmf 15k Ohm 5% 1/16w)
Cv006 (Part# 256858) (Cap Cc 1uf 10% 6.3v X5r)
Cv007 (Part# 244072) (Cccfmic 4n7f +10% -10% 50)
Usually Only Cv007 Is The Culprit
Peggs
At 10:49 AM 10/7/05, Moutons Electronics L.L.C. wrote:
>Hi everyone,
>This tv has weak video, very dark, on all inputs and tuner. The OSD if
>fine, nice and bright so I don't think I have a bad tube. This chassis has
>the micro/video all in one IC and will be on back order so I wanted some
>oppinions.
>
>I checked the RGB pins on the IC and have just over half the dc voltage I
>should have and when I check the wave form I have video but have a larger
>presentation when OSD is present. No big suprise since it looks better on
>screen.
>
>Since I will have to wait to get this ic I was wondering if I should check
>anything else. I tried the video inputs and they do the same thing and
>since it takes a completely different path than the tuner video the inputs
>to the IC should be good.
>
>Thanks
>
>Jason
>Moutons Electronics
>
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