We have a Sony KP51WS500 projection tv that we got for free on Craigslist. The previous owner didn't tell us what was wrong, so we turned it on and googled the symptoms. It had 5 blinking lights at startup, the display was bowed, the colors weren't in convergence, and in manual convergence PJE mode, only the blue would move. We ordered the convergence repair kit from tvrepairkits.com and checked fuses with our multimeter. There was one blown 5 amp pico fuse on the G Board and two blown 3.5 amp picos on the D board. We replaced those three fuses and also both IC chips on the D board. When we turned the tv on, the blinking stopped but the convergence was still off. We put it into manual convergence PJE mode and tried to move the colors but now none of them would move. The heatsink/IC chip on the right doesn't get warm at all but the one on the left does... since we didn't realize to check the warmth before we replaced the chip the first time, we tried resoldering in the original chip but to no avail, still a cold heatsink. We checked all the plugs and we're pretty sure all the soldering is good, no bridged connections.
Does anybody know what we can try next? Our only idea now is to purchase a new ic chip and replace that one one more time.
I would swap the chips before replacing them to see if the "good" chip (the one that's getting hot as configured now) still gets hot in the other position. If it does, it's probably a bad chip, if it doesn't, there's another problem (no power to the IC chip?). Just a suggestion before you purchase another chip. Sorry I can't help you more. The only guidance I can give is to use the service manual schematics and find all the resistors / capacitors in the circuit for the IC chips and see if you can find another damaged resistor / capacitor. Maybe one of those are fouling the system.
Good Luck!!
CVinje
Oh, and if you don't already have the service manual, here's a link to download it from the technicians corner:
http://www.techlore.com/download/23110/Sony-KP-51-57-65-WS500/
CVinje
Thanks for the reply! I do have the service manual, but we hadn't checked other fuses. The gameplan for tonight is to swap the IC's as suggested. If there's no power going to the IC chip, what's our next option?
If there's no power going to that chip, I'd assume you'll have to trace back all of the components associated with that circuit and check them. Look at everything is what I assume is the right thing to do (everything in that circuit per the schematic). Resistors, Pico fuses (if any), diodes (if any), capacitors, transistors, the power source leading to that chip (maybe a cable is unplugged?), etc. Look online for how to test these different parts. Other than that, I've read about people testing the voltages at the convergence IC pins to see if "some" voltage is getting to them.
If no power, I'd assume it'd be like getting no water to your home - there must be a blocked / broken pipe (circuit) somewhere. I'm no expert and am just starting out in this stuff, so maybe somebody with more experience can chime in here to guide us more, but that is what I'd do to start. Be careful and be sure to read how to test each part mentioned above, some should be removed from the circuit before testing (removed from the board). Best of luck to you!
CVinje
recheck all your work, solder and wiring connectors. It's easy to damage a trace when desoldering, so check continuity to and from all components you replaced.