Thanks to all those that sent me schematics and tips on this Toshiba CZ27V51 with excessive brightness. This was really a tough one. It turned out to be Q908 (part of a 7 transistor circuit on the CRT board), even though the voltage on the B and E of the output transistors was OK. Really seemed like an ABL problem.
Q908 was leaky and I couldn't see that it was critical to even have this transistor circuit functioning. I disconnected the collector and the brightness finally went normal (was way too bright). Replaced Q908. Thanks again for sending the prints and tips. Funny thing - the print with a model no. that was almost the same (CZ32V51) didn't have this special circuit on the CRT board. The 27A60 did! -- Best regards, Bil Green 2001 TV VCR Mammoth Lakes, CA 93546 760-934-2001 mailto:[EMAIL PROTECTED] Thursday, January 22, 2004, 7:40:03 PM, you wrote: BG> Toshiba 27" TV BG> Model CZ27V51 or ANY SIMILAR model BG> Chassis TAC 9911 BG> 2000 Model BG> I DIDN'T GET ANY RESPONSE FROM SEVERAL LISTS I POSTED TO LAST NIGHT BG> I REALIZE IT'S A HASSLE TO SCAN TV SCHEMATICS. Maybe someone has a BG> 1999 or 2001 print or even a 19" with the same jungle chip - Just BG> need a small portion or even a couple voltages to check instead. BG> NEED SCHEMATIC OR HELP BG> Bright screen with retrace lines BG> Screen voltage is normal (and turning screen down causes red smear) BG> CRT cathodes are around 70V (200V supply is normal). Color output BG> transistors base and emitter voltage is normal. BG> ADJUSTING THE BRIGHTNESS LIMITER IN THE SERVICE MENU CAUSES NO BG> CHANGE. Other adjustments do work BG> A few weeks ago the CRT went bad (no vacuum) and R216 was smoking. BG> I replaced the CRT and R216 (with a 22k) and the set worked OK. BG> I need a partial print (brightness limiter circuit - flyback to BG> jungle chip) or someone to tell me the correct value of R216 and BG> other parts in that circuit which may be causing a brightness BG> limiter problem. _________________________________________ Please include original text when replying to this email. Once you get your unit repaired, please post the fix to the group. Order your tech repair CD today, Version 3.0 only $49.00-more monitor tips-user friendly program. [EMAIL PROTECTED] www.tech-repair.net ______ Techs mailing list [EMAIL PROTECTED] http://intrepid-video.com/mailman/listinfo/techs_intrepid-video.com Go to the link above and scroll to the bottom to enter your email address
