RCA 36648 ctc203 intermittant startup


	FORUM HOME	SEARCH POSTS	WHO'S ONLINE	LOG IN	RULES F.A.Q.

TV Forums: TV Equipment: TV Repair Forum:
RCA 36648 ctc203 intermittant startup

Print Thread

ouxly40
New User

Apr 25, 2005, 3:05 AM

Post #1 of 4 (1337 views)
Shortcut

RCA 36648 ctc203 intermittant startup	Can't Post

well, thats no longer the case. now, it wont stsrt up at all. I monitor the power supply, many voltages are there, no change when the button is pushed. got good B+ on HOT, no relay click. What part of the power supply does the power switch eventually turn on?

StarBaseONE2
New User

Apr 26, 2005, 2:33 PM

Post #2 of 4 (1326 views)
Shortcut

Re: [ouxly40] RCA 36648 ctc203 intermittant startup [In reply to]	Can't Post

Jump the start relay. Will that start the TV? If so replace relay, if not backtrace start relay find where loss of voltage occurs. Likely this will be a small transformer. Good luck

ouxly40
New User

Apr 26, 2005, 8:57 PM

Post #3 of 4 (1317 views)
Shortcut

Re: [StarBaseONE2] RCA 36648 ctc203 intermittant startup [In reply to]	Can't Post

The relay is not being energized. the diagram i have is slightly different. this is a -CA7 chassis. the system control unit is in a shielded box on the side. it has 5v and the power switch is getting the signal to the CPU, but nothing is coming out. i don't usually suspect MPU units. it is usually some bad input it has somewhere.

also, does anyone know what Q901 can be replaced with? It's an SMD, NPN used as a switch ( 5volts on the base, 0 on E). I dropped it on the floor.

Bursma
User

Apr 29, 2005, 1:56 PM

Post #4 of 4 (1301 views)
Shortcut

Re: [ouxly40] RCA 36648 ctc203 intermittant startup [In reply to]	Can't Post

Well, I see 3 things Q901 could be: Q11901 (Chassis transistor part #215495) , Q14901(Chassis transistor p# 147665), Q26901 (Transistor in Analog comb filter p#215496). If you want to get some of those through us, Bursma, let me know.

Print Thread

Search for (options)

- Page loaded in: 0.19 s on (CGI/1.1)