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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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RCA TV CTC169(BG5) Wont come out of standby - Ticking sound when Power button is pressed
Hi all-
I have an RCA 35" direct view TV. It wont come out of standby. When the power button is pressed a ticking sound is heard - only while the button is pressed. Upon inspection, R4001 (1.8 15W) resistor was found to have cracked solder joints. RT 4201 was replaced because it came apart. CR4120 was replaced because it was physically blown. CR4118 was replaced, along with C4102 (2.2@100V) and C4108 (replaced with 47uf@100V) in an attempt tp fix this problem. Standby voltage is 143V at TP 4101, and +15 standby is 12.7V at TP4103. When power button is pressed, both voltages drop (143 down to 110, 127. drops to 10V). Problem remains - wont come out of standby, ticking sound when power button is pressed. Appreciate any help Thanks Mark |
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RCA TV CTC169(BG5) Wont come out of standby - Ticking sound when Power button is pressed
On Mon, 22 Sep 2003 00:12:25 GMT,
wrote: Hi all- I have an RCA 35" direct view TV. It wont come out of standby. When the power button is pressed a ticking sound is heard - only while the button is pressed. Upon inspection, R4001 (1.8 15W) resistor was found to have cracked solder joints. RT 4201 was replaced because it came apart. CR4120 was replaced because it was physically blown. This is very clear case that it might had surge or horizontal circuit blew in turn blew the SMPS. CR4118 was replaced, along with C4102 (2.2@100V) and C4108 (replaced with 47uf@100V) in an attempt tp fix this problem. There are four electrolytic capacitors in SMPS, missed 15uF 100V and 470uF 35V replace them, change 47uF to 39uF 100V this helps the SMPS to run cooler, was running change during CTC169 production. This cap is in series from SMPS IC to this base of SMPS Q4101 transistor. Standby voltage is 143V at TP 4101, and +15 standby is 12.7V at TP4103. When power button is pressed, both voltages drop (143 down to 110, 127. drops to 10V). Both volts are good in standby. But you still have a problem in run mode. Unsolder collector of the HOT (Q4401) and try again. If TV stays on without ticking, this means either flyback transformer, focus/G2 screen block or tube is bad. Carefully decide if this set is worth fixing because most of them I fixed in 35" size like this tube were usually used up and new tube for this is over 1,400. New set is best. The flyback is about $120 retail. Decide real carefully. Cheers, Wizard |
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