[TechAssist] Re: rca f27250bc dead

Here are a few of my solutions for this chassis. I hope it helps.

CHECK U4101 REG., R4001, C4109 OR C4137 MAY SHORT AND CAUSE THIS PROBLEM.  

IF 0 VOLTS ON PIN 2 OF U3101, CHECK FOR COLD SOLDER AROUND JC403 AND R3132
  
CHECK FOR SHORTED CR4704 AND OPEN R4702, R4517 (RESISTORS SHOULD BE OEM ONLY).  

IF 5V MEASURED ON PIN 5 OF U3101, REPLACE U1001  

IF NO COLLECTOR WAVEFORM ON Q4301, REPLACE Q4301  

CHECK TRACES IN AREA OF JC403 AND JC411  

CHECK TRACES AT JC404 AND JW317
  
IF CIRCUIT BETWEEN JC403 AND JC411 OPEN, REPLACE JC411  

Replaced C4105 - 10UF/250V, CR4704, R4702 - 3.3ohm/1W and R4517 - 24ohm/1W.  

R4104 checks ok but is intermittant
  
R4001 OPEN  

Replace open R4101 (1.5M 1/4 W)--supplies drive to U4101 B+ Reg  

Pin 6 of micro(U3101) was zeroV.(normally 5V) Channel up switch shorted.  

REPLACE C4137, C4105, C4130, U4101  

REPLACE CR4106 PRF856, STK730-010 REGULATOR  

DEAD AFTER TUNER REPAIR REMOVE BRIDGE BETWEEN JUMPERS JW400 AND JW470 ON TOP 
SIDE OF BOARD


John Florea
Affordable ELectronics
Tumwater Wash. 98501
----- Original Message -----
From: Jim Myers
Sent: Monday, October 08, 2001 1:26 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Re: rca f27250bc dead


Probably a bad eeprom, u3201, p/n 224281. See that you have 5v, data and clk
present on the eeprom, if so it is probably keeping the set from turning on.
Jim Myers
jr.myers@xxxxxxxxxxx
----- Original Message -----
From: "adam miller" <adamt123@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, October 08, 2001 2:59 PM
Subject: [TechAssist] rca f27250bc dead


>
> hey guys,
>
> i have an rca model f27250bc chasis ctc177bh3 that is dead. fuses ok, have
> standby voltages, checked around tuner, looks like someone before me tried
> to fix ground problems on tuner, dont have a print, any suggestions?
>
> troy
>
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